Mobile phone shell with perovskite solar cell and support

Abstract

The utility model belongs to the field of electronic terminal equipment protective shells, and particularly discloses a mobile phone shell with a perovskite solar cell and a support, which comprises a back plate and a frame, the back plate and the frame are connected through a connecting part to form a mounting cavity matched with a mobile phone, the back plate is provided with an angle-adjustable support assembly composed of a support body and a hinge structure, and the support assembly is provided with an angle-adjustable support. Perovskite solar cells in various forms are arranged on the support body and the back plate, and all the perovskite solar cells are connected in series or in parallel and then are electrically connected with a charging interface for charging a mobile phone. In addition, the perovskite solar cell is a flexible perovskite thin-film solar cell which can be folded and curled. According to the mobile phone shell provided by the utility model, not only can angle adjustment be realized, but also the power generation area of the solar cell panel is greatly expanded, so that sufficient power generation can be ensured, the charging efficiency of a mobile phone is ensured, and the weight and the size of the mobile phone shell cannot be greatly increased.

Description

Technical Field

[0001] The utility model belongs to the field of protective cases for electronic terminal devices, and particularly relates to a mobile phone case with a perovskite solar cell and a bracket. Background Art

[0002] With the increasing development of technology, intelligent electronic terminal devices are becoming more and more popular among people. In particular, smart phones have become an indispensable part of our lives. Their appearance has not only changed people's lifestyles, but also brought many conveniences to people's lives and work. However, due to the need for portability, they often do not have a large-capacity battery or energy storage component, and their usage or standby time is generally short, making it difficult to meet the continuous use for a long time.

[0003] To overcome the above problems, people usually carry a mobile power supply (portable charger) to charge their mobile phones when going out. However, on the one hand, the mobile power supply is large in size and inconvenient to carry, and on the other hand, it is necessary to ensure that the mobile power supply has enough power before going out, which brings a bad experience to users.

[0004] According to relevant industry data statistics, more than 80% of mobile phone users will choose a mobile phone case. However, most of the existing mobile phone cases only have the functions of protection or decoration, and generally have problems such as single function and limited use scenarios of the mobile phone. More and more mobile phone users have more and more practical expectations for mobile phone cases. Therefore, some solar charging mobile phone cases have appeared on the market. For example, a mobile phone with a solar charging function is disclosed in the Chinese utility model patent with the publication number CN218850822U. However, this solar charging mobile phone case still has problems such as a small area of the solar panel and low charging efficiency. In addition, the solar charging panel used is a crystalline silicon panel, and its disadvantage is that its light absorption range is relatively narrow, mainly concentrated in the visible light band, and its ability to absorb infrared light is weak. This means that in an environment with weak light or uneven spectral distribution, the power generation efficiency of the crystalline silicon photovoltaic panel is very low. In addition, the crystalline silicon panel is relatively heavy and not easy to curl, and generally can only be set in a partial area on the front and back of the mobile phone case. Especially for a curved mobile phone case, the crystalline silicon photovoltaic panel cannot effectively expand the coverage area.

[0005] In view of this, this utility model is specifically proposed. Content of the Utility Model

[0006] The purpose of the present utility model is to overcome the above-mentioned disadvantages of the prior art, and provides a mobile phone case with a perovskite solar cell and a bracket. Due to the flexible bending and folding characteristics of the perovskite thin-film solar cell of the present utility model, its power generation area is expanded on the mobile phone case through various combination methods. Combining its own wider light absorption range and higher photoelectric conversion efficiency, and the adjustment of the light intensity can be achieved through the bracket assembly, thus improving the power generation area and charging efficiency of the solar panel, and achieving the purpose of stably charging the mobile phone at any time.

[0007] The purpose of the present utility model is solved by the following technical solutions:

[0008] A mobile phone case with a perovskite solar cell and a bracket provided by the present utility model includes:

[0009] A back plate, provided with a first window exposing the mobile phone camera and flash;

[0010] A frame, enclosed and arranged around the back plate;

[0011] A connecting part, arranged at the joint of the back plate and the frame, used to connect the back plate and the frame to form an installation cavity adapted to the mobile phone;

[0012] A bracket assembly, arranged in a preset accommodation groove between the two long sides of the back plate, and one end of the bracket assembly is movably connected to the frame, used to adjust the angle of its expansion relative to the back plate;

[0013] Wherein, a first perovskite solar cell is arranged on the periphery of the bracket assembly. The first perovskite solar cell realizes the adjustment of the received light intensity through the angle adjustment of the bracket assembly and the back plate, and the first perovskite solar cell is electrically connected to a charging interface arranged on the back plate for charging the mobile phone.

[0014] Further, a second perovskite solar cell is covered and arranged on the outer surface of the back plate and around the first window and the accommodation groove, and the second perovskite solar cell is connected to the first perovskite solar cell to form a series circuit or a parallel circuit.

[0015] Further, the bracket assembly includes a bracket body and a hinge structure. A substrate is connected to the upper part of the circumference of the bracket body. The first perovskite solar cell is foldably arranged on the substrate, and one end of the bracket body is movably connected to the frame through the hinge structure;

[0016] Wherein, when the bracket assembly is completely folded up, the bracket body is embedded in the accommodation groove opened on the back plate, and a notch is arranged on the edge of one end of the accommodation groove far from the hinge part to facilitate taking out the bracket body.

[0017] Further, the hinge structure includes a plurality of notches equidistantly formed at one end of the bracket body and convex teeth inserted between any two adjacent notches. One end of the convex tooth is fixedly connected to the frame, and the other end is inserted into the notch and then articulated through a pin insertion, which is used to adjust the angle of the first perovskite solar cell receiving light intensity and the angle of the bracket body relative to the backplane unfolding.

[0018] Further, it further includes a rollable perovskite solar cell module. The rollable perovskite solar cell module includes a receiving seat fixedly arranged on the surface of the bracket body and having a receiving cavity and a through slot. A fixed rod, a return spring, a hollow scroll, and a third perovskite solar cell are coaxially sleeved in the receiving cavity of the receiving seat from the center outwards in sequence;

[0019] Wherein, one end of the return spring is fixed on the hollow scroll, and the other end is fixed on the fixed rod; the third perovskite solar cell is wound around the hollow scroll, and the inner end of the third perovskite solar cell is fixedly connected to the hollow scroll, and the outer end extends out of a preset through slot on the receiving seat.

[0020] Further, a pulling piece is arranged at the outer end of the third perovskite solar cell, and the pulling piece is blocked outside the receiving seat by the through slot.

[0021] Further, an electrode connecting body is arranged at one end of the third perovskite solar cell located inside the receiving seat, and one end of the electrode connecting body passes through the receiving seat and is connected to the first perovskite solar cell to form a series circuit or a parallel circuit.

[0022] Further, the first perovskite solar cell, the second perovskite solar cell, and the third perovskite solar cell all adopt flexible and foldable and rollable perovskite thin-film solar cells;

[0023] Wherein, the first perovskite solar cell is stored on the substrate in a folded manner. The length and width of the substrate are the same as those of the backplane, and a second window exposing the mobile phone camera and the flash is opened on the substrate. When in use, the area of the first perovskite solar cell is expanded by unfolding.

[0024] The second perovskite solar cell is attached to the backplane. If the backplane includes a curved surface, the second perovskite solar cell should cover the entire backplane including the curved surface.

[0025] Further, the structures of the first perovskite solar cell, the second perovskite solar cell, and the third perovskite solar cell all at least include a transparent conductive substrate, an electron transport layer, a perovskite layer, a hole transport layer, and a metal electrode layer which are stacked in sequence from bottom to top;

[0026] Among them, the transparent conductive substrate is made of flexible glass with a thickness of 0.03 mm to 2 mm;

[0027] The thickness of the electron transport layer is 20 nm to 50 nm;

[0028] The thickness of the perovskite layer is 200 nm to 800 nm;

[0029] The thickness of the hole transport layer is 50 nm to 200 nm;

[0030] The thickness of the metal electrode layer is 80 nm to 150 nm.

[0031] Furthermore, the positions of the electron transport layer and the hole transport layer can be interchanged, that is, the first perovskite solar cell, the second perovskite solar cell, and the third perovskite solar cell are either normal perovskite solar cells or inverted perovskite solar cells. Preferably, a passivation layer may also be included between the structural layers of each cell.

[0032] Further, the frame is provided with a charging hole exposing the mobile phone charging port, a card slot hole exposing the mobile phone card slot, and a button part for placing and protecting the mobile phone buttons;

[0033] The back plate, the frame, and the connecting part are all made of a plastic material with elasticity and damping force.

[0034] Compared with the prior art, the present utility model has the following beneficial effects:

[0035] The mobile phone case provided by the solution of the present utility model utilizes the characteristics of perovskite thin-film solar cells being lightweight, extremely thin, flexible, and bendable / foldable, and having a wider light absorption range and higher photoelectric conversion efficiency compared with crystalline silicon solar cells. By arranging different forms of perovskite thin-film solar cells on the back plate of the mobile phone case and the adjustable bracket body (including the first perovskite solar cell arranged around the bracket body, the third perovskite solar cell in a roll form arranged on the bracket body, and the second perovskite solar cell covering the entire back plate (which may include a curved surface)), the area of the solar cell panel is thus greatly expanded. In addition, the bracket provided on the mobile phone case can be adjusted according to the intensity of the light received by the perovskite thin-film solar cell, so it can ensure sufficient power generation, thereby ensuring the charging efficiency of the mobile phone compared with the prior art. Moreover, in addition to the conventional functions of protecting the mobile phone and decoration, the mobile phone case can also supplement energy for the mobile phone through solar power generation, and does not significantly increase the weight and volume of the mobile phone and does not lose the portability of the mobile phone, solving the problems of single function and limited use scenarios of ordinary mobile phone cases, meeting the user's more practical expectations for the mobile phone case, and the need to use the mobile phone conveniently and durably in the natural environment. At the same time, the manufacturing process of the mobile phone case is simple, and the thin-film structure is particularly suitable for being made on the mobile phone case, thus facilitating large-scale mass production. Brief Description of the Drawings

[0036] The drawings herein are incorporated into and form a part of this specification, and are used together with the specification to explain the principles of the present utility model.

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0038] Figure 1 is a schematic diagram of the overall structure of the mobile phone case in Embodiment 1 of the present utility model;

[0039] Figure 2 is an enlarged schematic diagram of the bracket assembly part (the first perovskite solar cell around the bracket is not shown) in the mobile phone case in Embodiment 1 of the present utility model;

[0040] Figure 3 is a schematic diagram of the connection between the bracket body and the first perovskite solar cell in the mobile phone case in Embodiment 1 of the present utility model;

[0041] Figure 4 is a schematic diagram of the overall structure of the mobile phone case in Embodiment 2 of the present utility model;

[0042] Figure 5 is a schematic diagram of the overall structure of the mobile phone case in Embodiment 3 of the present utility model;

[0043] Figure 6 is a schematic diagram of the rollable perovskite solar cell assembly in the mobile phone case in Embodiment 3 of the present utility model.

[0044] In the figures:

[0045] 1 is the back plate; 11 is the first window; 12 is the receiving groove; 121 is the notch;

[0046] 2 is the frame; 21 is the charging hole; 22 is the card slot; 23 is the button part;

[0047] 3 is the connecting part;

[0048] 4 is the bracket assembly; 41 is the bracket body; 42 is the hinge structure; 421 is the notch; 422 is the convex tooth;

[0049] 5 is the first perovskite solar cell;

[0050] 6 is the charging interface;

[0051] 7 is the second perovskite solar cell;

[0052] 8 is the substrate; 81 is the second window;

[0053] 9 is a rollable perovskite solar cell module; 91 is a receiving seat; 92 is a fixing rod; 93 is a reset spring; 94 is a hollow reel; 95 is a third perovskite solar cell. Detailed implementation mode

[0054] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present utility model. On the contrary, they are only examples of devices consistent with some aspects of the present utility model detailed in the appended claims.

[0055] In order to enable those skilled in the art to better understand the technical solution of the present utility model, the present utility model will be further described in detail below in conjunction with the drawings and embodiments.

[0056] Embodiment 1

[0057] Please refer to Figures 1 - 3 , a mobile phone case with a perovskite solar cell and a bracket provided by an embodiment of the present utility model includes: a back plate 1, on which a first window 11 exposing the mobile phone camera and the flash is opened, mainly used to protect the rear of the mobile phone; a frame 2, surrounded and arranged around the back plate 1, on which a charging hole 21 exposing the mobile phone charging port, a card slot 22 exposing the mobile phone card slot, and a button part 23 for placing and protecting the mobile phone buttons are provided, mainly used to protect the four corners and the sides of the mobile phone; a connecting part 3 is arranged at the joint of the back plate 1 and the frame 2, used to connect the two to form an installation cavity adapted to the mobile phone. It should be noted that in this embodiment, the first window 11, the charging hole 21, the card slot 22, the button part 23, and the heat dissipation holes, etc., are not listed one by one, and the specific positions and specifications can be set according to the mobile phone of the model to be adapted.

[0058] The mobile phone case of the embodiment of the present utility model further includes a bracket assembly 4, which is arranged in a preset receiving groove 12 between the two vertical long sides of the back plate 1, and one end of the bracket assembly 4 is movably connected to the frame 2, used to adjust the angle of the bracket assembly 4 unfolded relative to the back plate 1. Preferably, the bracket assembly 4 is horizontally arranged in the middle and lower part of the back 1, so that when the bracket assembly 4 is opened, the mobile phone can be placed horizontally or vertically without tipping over.

[0059] Among them, in the embodiment of the present utility model, the bracket assembly 4 includes a rectangular plate-shaped bracket body 41 and a hinge structure 42. One end of the bracket body 41 is movably connected to the frame 2 through the hinge structure 42. When the bracket assembly 4 is completely retracted, the bracket body 41 is just embedded in the receiving groove 12 opened in the back plate 1. At this time, the bracket body 41 is flush with the outer surface of the back 1, that is, it is required that the thickness of the bracket body 41 is equivalent to the depth of the receiving groove 12, and a notch 121 is provided at the edge of the receiving groove 12 far from the hinge portion 12, which is convenient for lifting the mobile phone and hitting the bracket body 41 from this notch.

[0060] Specifically, as Figure 2 shown, in this embodiment, the hinge structure 42 includes a plurality of notches 421 equally spaced on one end of the bracket body 41 and a convex tooth 422 inserted between any two adjacent notches 421; the depth of the notch 421 should be less than the height of each convex tooth 422, and the width of the notch 421 is less than or equal to the thickness of the convex tooth 422. In this embodiment, the number of notches 421 and convex teeth 422 is 4. One end of the convex tooth 422 is fixedly connected to the frame 2, and the other end is inserted into the notch 421 and then articulated through the insertion of a shaft pin, which is used to adjust the angle of the bracket body 41 relative to the back plate; at the same time, the convex tooth 422 provides support for the bracket body 41 and disperses the force on the bracket body 41. Of course, the hinge structure 42 can adopt other forms, and the present utility model does not make special limitations, as long as it can conveniently realize any angle of the bracket body 41 relative to the back 1 of not less than 90°, for example, a gear hinge, a spring damping hinge, etc. can also be selected.

[0061] Among them, the back plate 1, the frame 2, the connecting portion 3 and the bracket assembly 4 of the present utility model are all made of a plastic material with elasticity and damping force. Specifically, in this embodiment, the material of the back plate 1 is polycarbonate; the material of the outer frame 2 is thermoplastic polyurethane elastomer rubber, because thermoplastic polyurethane elastomer rubber has excellent elasticity and can give a certain buffering effect when the mobile phone is impacted or dropped to the ground, preventing the mobile phone from being damaged; the connecting portion 3 and the bracket assembly 4 are made of a composite material of polyurethane and polycarbonate.

[0062] It is worth noting that in the embodiment of the present utility model, a first perovskite solar cell 5 is connected circumferentially to the bracket assembly 4. The first perovskite solar cell 5 adjusts the received light intensity through the angle adjustment of the bracket assembly 4 relative to the back plate 1, and the first perovskite solar cell 5 is electrically connected to a charging interface 6 provided on the back plate 1 for charging the mobile phone. Specifically, as Figure 1 、 3As shown in the figure, a substrate 8 is connected to the upper part of the circumferential direction of the bracket body 41. The first perovskite solar cell 5 is arranged on the substrate 8 in a folding manner. The length and width of the substrate 8 are the same as those of the backplane 1, and a second window 81 for exposing the mobile phone camera and flashlight is opened on the substrate 8. During use, the area of the first perovskite solar cell 5 is expanded by unfolding. It should be noted that the substrate 8 is provided with a notch at one end of the bracket body 41 away from the hinge structure 42 to facilitate the opening and closing of the bracket assembly 4 by fingers; in addition, the substrate 8 and the bracket body 41 can be fixedly connected, and of course, they can also be detachably connected. The specific connection structure is not specifically limited in the embodiments of the present invention.

[0063] In the embodiment of the present invention, the first perovskite solar cell 5 adopts a flexible perovskite thin-film solar cell that can be folded and curled. When not in use, it can be stored by folding. When in use, it can be unfolded to generate electricity and the best angle for absorbing light can be adjusted through the bracket assembly 4, thereby improving the power generation capacity.

[0064] In the present invention, the first perovskite solar cell 5 can be a normal perovskite thin-film solar cell or an inverted perovskite thin-film solar cell. In this embodiment, the normal perovskite thin-film solar cell is taken as an example, which at least includes a transparent conductive substrate, an electron transport layer, a perovskite layer, a hole transport layer, and a metal electrode layer that are sequentially stacked from bottom to top; wherein, the transparent conductive substrate adopts flexible glass with a thickness of 0.03 mm to 2 mm. Preferably, a layer of laminated polymer plastic is attached on the outside, which can make the glass bend without breaking. In addition, a transparent conductive material, including indium tin oxide (ITO), fluorine-doped tin oxide (FTO), etc., is deposited on the flexible glass, and its thickness is about 1 μm; the thickness of the electron transport layer is 20 nm to 50 nm; the thickness of the perovskite layer is 200 nm to 800 nm; the thickness of the hole transport layer composition is 50 nm to 200 nm; the thickness of the metal electrode layer is 80 nm to 150 nm.

[0065] Specifically, the electron transport layer includes at least one of TiO2, SnO2, and methyl fullerenes (PCBM); the perovskite layer includes methylammonium lead iodide (CH3NH3PbI3), methylammonium lead bromide (CH3NH3PbBr3), cesium lead chloride (CsPbCl3), cesium lead bromide (CsPbBr3), cesium lead bromide chloride (CsPbBrxCl 3-x) at least one of lead sulfide (PbS); the hole transport layer includes at least one of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS), poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA), NiOx, Spiro-OMeTAD; the cathode is a transparent conductive oxide electrode for collecting mobile free electrons, including at least one of titanium oxide (TiO2), zinc oxide (ZnO), and vanadium oxide (V2O5); the anode is a metal electrode for collecting mobile free holes, including at least one of gold, aluminum, silver, and copper. Preferably, it further includes a first passivation layer, a second passivation layer, and an outer protective layer. The first passivation layer includes at least one of bis-amino cystamine dihydrochloride (CMDR), amino acid L-aspartic acid (LAA), histidine, poly-4-vinylpyridine (P4VP), ethylenediamine dihydroiodide (EDAI2), and hexamethylene diisocyanate (HDI); the second passivation layer includes at least one of tetrabutylammonium chloride (TBAC), hexadecyltrimethylammonium hexafluorophosphate (HTAP), inorganic potassium fluoride (KF), and trimethylsulfonium bromide (TMSBr); the outer protective layer is at least one of plastic and glass.

[0066] Furthermore, the preparation process of the perovskite thin-film solar cell in the embodiment of the present invention is as follows:

[0067] 1) Prepare the perovskite thin film

[0068] First, prepare the perovskite material. Specifically, methylammonium lead iodide (CH3NH3PbI3) can be selected as the perovskite material, which is an organic-inorganic hybrid semiconductor material with a high light absorption coefficient and carrier mobility. Then, prepare the perovskite thin film: First, dissolve methylammonium lead iodide in a mixed solution of dimethyl sulfoxide (DMSO) and γ-butyrolactone (GBL) to prepare a precursor solution with a concentration of 1.0 M to 1.5 M; then, spin-coat the precursor solution on a pre-cleaned glass substrate at a speed of 2800 rpm to 3200 rpm for 25 to 35 seconds; then, anneal the spin-coated sample on a hot plate at 90 to 110 °C for 8 to 12 minutes to form the perovskite thin film;

[0069] 2) Prepare the perovskite solar part

[0070] First, a layer of gold with a thickness of 90 nm to 110 nm is vacuum-evaporated on a substrate as the anode; then, a layer of poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) with a thickness of 45 nm to 55 nm is spin-coated on the anode as the hole transport layer; next, a perovskite thin film is introduced onto the hole transport layer; a layer of PCBM with a thickness of 180 nm to 220 nm is spin-coated on the perovskite thin film as the electron transport layer; finally, a layer of aluminum with a thickness of 90 nm to 110 nm is vacuum-evaporated on the electron transport layer as the cathode, forming a perovskite thin film solar cell; among them, [6,6]-phenyl C61 butyric acid methyl ester (PCBM) is a methyl fullerene, which has a higher solubility in organic solvents than fullerene (C60), PCBM is an n-type semiconductor with a high electron mobility and is the preferred electron transport material.

[0071] 3) Test the performance of the perovskite solar cell and form a module.

[0072] First, use a solar simulator to test the optoelectronic performance of the cell, including open-circuit voltage, short-circuit current, fill factor, and photoelectric conversion efficiency, etc.; then, use a universal testing machine to test the mechanical performance of the cell, including bending strength, folding angle, and cutting accuracy, etc.; then, use an environmental test chamber to test the environmental adaptability of the cell, including high temperature, low temperature, high humidity, and ultraviolet aging, etc.; finally, cut and package the perovskite solar cell that meets the test standards to form a perovskite solar module.

[0073] Furthermore, the structure, materials, and parameters of the perovskite solar module enable it to maintain good optoelectronic performance under bending, folding, and cutting conditions. The work on its design, preparation, and optimization includes but is not limited to material selection, structure design, optimization of the carrier transport layer, etc. In reality, crystals are affected by the growth and subsequent processing processes and will generate defects. For example, the spin-coating preparation process and the annealing process of perovskite (PSCs) devices will form various defects on the surface or grain boundaries of polycrystalline perovskite crystals. Defects with positive or negative charges will introduce transition energy levels in the bandgap and may form deep-level defects, which are not conducive to the extraction and migration of carriers in the perovskite thin film, and will also affect the carrier lifetime. It is an important reason that hinders the improvement of VOC (open-circuit voltage) and fill factor (FF) in PSCs. In addition, there are more or less defects in the commonly used electron transport layer (ETL) and hole transport layer (HTL) materials. This solution can passivate the defects of each component of PSCs to improve the efficiency and stability of the device. For example, the carrier extraction efficiency and VOC can be improved through the energy level matching between the ETL / perovskite interface; specific passivation strategies include but are not limited to technical means such as interface treatment, introduction of additives, and dopants to improve the overall performance of PSCs.

[0074] More specifically, cystamine dihydrochloride (CMDR) with diamino groups is introduced between the TiO2 ETL and the perovskite layer. The diamino groups of CMDR can not only form TiN bonds with TiO2 but also form hydrogen bonds with I- in the perovskite, effectively inhibiting the generation of excessive Pb0 defects in PbI2. The oxygen vacancies (Oxygen Vacancy, VO) and hydroxyl defects on the SnO2 ETL will damage the uniformity of the perovskite film. If the multifunctional amino acid L-aspartic acid (LAA) is used to regulate the SnO2 / perovskite interface, -COOH in LAA can coordinate the mismatched Sn4+ in SnO2, thereby reducing the VO defects of SnO2. At the same time, it can also neutralize the alkalinity of the hydroxyl groups on the SnO2 side. Through bilateral synergistic passivation, LAA can "connect" the SnO2 / perovskite interface, accelerate electron transfer at the interface, and reduce the trap state density at the interface. For example, using multifunctional histidine as the crosslinking agent at the SnO2 ETL / perovskite interface, the strategy of promoting the tight crosslinking of SnO2 and perovskite is beneficial to electron extraction and transfer, improves the quality of the perovskite film, and reduces non-radiative recombination between interfaces. The crosslinking agent can also effectively adjust the interface energy level and accelerate electron transfer.

[0075] Furthermore, for the p-i-n structure: poly-4-vinylpyridine (P4VP) is introduced as an intermediate layer between the perovskite / [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) interface to passivate the defects located on the surface and grain boundaries. P4VP can effectively regulate the energy level matching between the perovskite and PCBM, facilitating efficient charge extraction between interfaces and inhibiting hole transfer. A passivation strategy based on a dual interface is adopted. On the basis of the already introduced ethylenediamine dihydroiodide (EDAI2) interface passivation layer, a hexamethylene diisocyanate (HDI) interface layer is introduced to further treat the perovskite / PCBM interface. The recombination at the perovskite / PCBM interface after EDAI2 / HDI passivation is significantly inhibited, and an extremely low non-radiative VOC loss of 0.10 V is obtained. The isocyanate group in the HDI molecule is easily crosslinked with the amine group in EDAI2 even at room temperature. The crosslinked molecules are formed on the perovskite surface, which helps to hinder the diffusion of EDA2+ cations into the perovskite, making the PSCs after EDAI2 / HDI passivation have excellent thermal stability.

[0076] Furthermore, for n-i-p type PSCs: the interfacial passivation material should be directly deposited on the perovskite film, and the solvent for dissolving the interfacial passivation material must be an inert solvent that does not damage the perovskite film. Halide anions or pseudohalide anions can chemically react with the anion vacancies or cation defects on the surface of the perovskite film through ionic bonds or hydrogen bonds, thereby improving the crystallinity of the perovskite film. A single layer of tetrabutylammonium chloride (TBAC) was introduced at the perovskite / Spiro-OMeTAD interface using a simple solution method. When TBAC is deposited on the perovskite film, the Cl- in TBAC will enter the perovskite lattice by occupying the I- vacancies in the perovskite film or acting as an interstitial, which makes TBAC have a strong interfacial dipole pointing to the outer surface of the perovskite, promoting the built-in electric field and at the same time reducing the contact barrier for hole extraction. Coating the top of the perovskite layer with hexadecyltrimethylammonium hexafluorophosphate (HTAP) achieved a terminal sealing passivation strategy, which can not only provide a good "channel" for hole extraction, but also provide a defect passivation layer for enhancing VOC and FF; the PF6- in HTAP can fill the halide anion vacancies on the perovskite film and can anchor the uncoordinated Pb2+, which helps to improve the crystallization and morphology of the perovskite film; the sealing passivation strategy also effectively alleviates the lead leakage problem.

[0077] Furthermore, when passivating the perovskite / HTL interface in the p-i-n structure, poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) is one of the most commonly used HTL materials for planar p-i-n structure PSCs; due to its high carrier mobility and high transmittance, NiOx has become a commonly used HTL in p-i-n structure PSCs in addition to PTAA. For example, an inorganic potassium fluoride (KF) interfacial buffer layer was introduced onto the PTAA substrate to adjust the surface energy level difference at the PTAA HTL / perovskite interface. KF was used to effectively reduce the maximum valence band of PTAA, which is beneficial for hole extraction, significantly increasing the recombination resistance at the PTAA / perovskite interface, thereby suppressing the carrier recombination between interfaces. For example, a trimethylsulfonium bromide (TMSBr) interface layer was introduced between the NiOx / perovskite interface by vapor deposition to eliminate the multi-step photodegradation of the NiOx-perovskite heterojunction during device fabrication, and to inhibit the formation of the PbI2 phase through the redox reaction between NiOx and organic iodide salts, which is beneficial for achieving strain release and extraction of carriers at the NiOx / perovskite interface; the TMSBr interface layer also has lattice parameters matching the perovskite crystal and a strong trap passivation ability.

[0078] Furthermore, additives are used to passivate the defects of the perovskite light-absorbing layer, effectively suppressing SRH non-radiative recombination by improving carrier extraction and transport; dopants are used to directly introduce passivators into the perovskite precursor solution, reducing the density of film trap states and suppressing carrier non-radiative recombination. However, this passivation strategy has the risk of introducing impurities into the perovskite crystal, and these impurities will affect the long-range ordered structure of the perovskite crystal. If the passivation sites are turned to the carrier transport layer adjacent to the perovskite layer, the dopant engineering of single-element doping of the carrier transport layer can promote the carrier transport rate, adjust the energy level barrier between interfaces, further passivate the defects of the perovskite film, control the crystallization process of the perovskite film and improve the crystallinity.

[0079] The perovskite solar cell implemented through the content of this embodiment generates electricity using the photovoltaic effect of semiconductors. When an N-type (electron-type semiconductor, i.e., an impurity semiconductor with a free electron concentration much greater than the hole concentration) and a P-type (hole-type semiconductor, a semiconductor mainly conducting with positively charged holes) semiconductor are in contact, due to the concentration difference of carriers themselves, diffusion occurs, and an internal built-in electric field is generated at the contact interface. At the same time, carriers drift under the action of the electric field, and diffusion and drift reach a dynamic equilibrium, forming a PN junction. Under the irradiation of sunlight, the perovskite light-absorbing layer with a high absorption coefficient will absorb a large number of photons with energy greater than or equal to the bandgap width, exciting electrons originally bound around the atomic nucleus from the top of the valence band to the bottom of the conduction band. At the same time, a positively charged hole is additionally generated to maintain electrical neutrality, and this pair of electrons and holes bound by the Coulomb force is an exciton. Due to the low exciton binding energy of perovskite, it will quickly dissociate into free electrons and holes under the action of the built-in electric field. Among them, the free electrons are transported to the cathode through the electron transport layer (ETL) and finally collected by the transparent conductive oxide (TCO) electrode; the free holes are transported to the anode through the hole transport layer (HTL) and then collected by the metal electrode. After the external mobile phone circuit is connected to the two electrodes, the component will form a current loop, thereby realizing photoelectric conversion and supplying electrical energy to the mobile phone and its battery.

[0080] Example 2

[0081] Such as Figure 4As shown in the figure, the only difference between the mobile phone case provided in this embodiment and that in Embodiment 1 is that a second perovskite solar cell 7 is covered and arranged on the outer surface of the back plate 1 and around the first window 11 and the receiving groove 12, and the second perovskite solar cell 7 is connected to the first perovskite solar cell 5 to form a series circuit or a parallel circuit. In this way, even when the first perovskite solar cell 5 is removed from the bracket assembly 4, the second perovskite solar cell 7 can still generate electricity to provide necessary electric energy for the mobile phone. The second perovskite solar cell 7 is attached to the back plate 1. If the back plate 1 includes a curved surface, the second perovskite solar cell 7 should cover the entire back plate 1 including the curved surface to expand the area of the solar panel and improve the charging efficiency.

[0082] Embodiment 3

[0083] As Figure 5 、 6 shown in the figure, on the basis of Embodiment 1 or Embodiment 2 or both Embodiment 1 and Embodiment 2, in order to further expand the power generation area of the perovskite solar cell, the mobile phone case provided in this embodiment of the present utility model further includes a scroll-type perovskite solar cell assembly 9. The scroll-type perovskite solar cell assembly 9 is fixedly connected or detachably connected to the bracket body 41, which is not specifically limited in this embodiment. The scroll-type perovskite solar cell assembly 9 is arranged along the length direction of the bracket body 41 and includes a receiving seat 91 having a receiving cavity and a through slot. The receiving seat 91 is horizontally and fixedly arranged on the outer surface of the bracket body 41. A fixed rod 92, a return spring 93, a hollow scroll 94 and a third perovskite solar cell 95 are coaxially sleeved in the receiving cavity of the receiving seat 91 from the center outwards in sequence.

[0084] Among them, one end of the return spring 93 is fixed on the hollow scroll 94, and the other end is fixed on the fixed rod 92; the third perovskite solar cell 95 is wound around the hollow scroll 94, and the inner end of the third perovskite solar cell 95 is fixedly connected to the hollow scroll 94, and the outer end of the third perovskite solar cell 95 extends out of a preset through slot on the receiving seat 91. When the outer end of the third perovskite solar cell 95 extends out of the receiving seat 91, a pull tab (not shown in the figure) is arranged at the outer end, and the pull tab is blocked outside the receiving seat 91 by the through slot. The pull tab plays the following two roles: on the one hand, it is convenient to pull the third perovskite solar cell 95, and on the other hand, it prevents the third perovskite solar cell 95 from being completely wound into the receiving cavity of the receiving seat 91.

[0085] Specifically, caps are installed at both ports of the receiving seat 91. Limit holes are provided on the caps, and both ends of the fixing rod 92 are sleeved in the limit holes. One end of the third perovskite solar cell 95 located inside the receiving seat 91 is provided with an electrode connecting body. One end of the electrode connecting body passes through the receiving seat 91 and is connected to the first perovskite solar cell 5 to form a series circuit or a parallel circuit. The third perovskite solar cell 95 transmits the electric energy converted by the third perovskite solar cell 95 to the mobile phone battery and its circuit through the electrode connecting body and then through the charging interface 6 for charging the mobile phone. In addition, a notch is formed on the outer surface of the receiving seat 91. A retractor is pivotally connected to the notch through a damping hinge shaft. The retractor is folded in the notch and is used for unfolding, braking, positioning or loosening and retracting the extended length of the third perovskite solar cell 95. A grip is provided at one end of the retractor for facilitating the opening of the retractor.

[0086] In actual use, since a return spring 93 is installed on the hollow reel 94 of the third perovskite solar cell 95, the outer end of the third perovskite solar cell 95 can be freely pulled out through the pull tab and is positioned by the retractor after being pulled out to form a solar cell for receiving light. When not in use, the retractor is opened, and the third perovskite solar cell 95 can automatically contract and reset under the action of the return spring 93. Therefore, the third perovskite solar cell 95 can be freely pulled out, contracted and hidden. Moreover, the extended length of the third perovskite solar cell 95 can be adjusted as needed. At the same time, the third perovskite solar cell 95 is hidden on the back of the mobile phone holder, with a compact structure, convenient to open and store, not occupying too much space, convenient to carry and use, thus improving the user experience.

[0087] In summary, in the present utility model, the first perovskite solar cell 5, the second perovskite solar cell 7 and the third perovskite solar cell 95 all adopt flexible perovskite thin-film solar cells that can be folded and curled. Among them, when not in use, the first perovskite solar cell 5 can be stored by means of flexible folding and can be unfolded when in use. When the second perovskite solar cell 7 adopts a flexible thin-film solar cell, it can be directly attached to the back plate 1. Even if the periphery of the back plate 1 has a curved surface, it can still be completely covered. The third perovskite solar cell 95 expands its power generation area by curling. Therefore, the mobile phone case provided by the present utility model not only has a bracket assembly with adjustable support, but also is provided with perovskite thin-film solar cells at multiple places on the back plate of the mobile phone case and the bracket body, effectively expanding the area of the solar power generation panel, thereby improving the mobile phone charging efficiency.

[0088] The above are only specific embodiments of the present utility model, enabling those skilled in the art to understand or implement the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model.

[0089] It should be understood that the present utility model is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of the present utility model is only limited by the appended claims.

Claims

1. A mobile phone case with a perovskite solar cell and a bracket, characterized in that, Comprising: A backplane (1) provided with a first window (11) exposing the mobile phone camera and flashlight; A frame (2) surrounding and arranged around the backplane (1); A connecting part (3) arranged at the joint of the backplane (1) and the frame (2) for connecting the backplane (1) and the frame (2) to form an installation cavity adapted to the mobile phone; A bracket assembly (4) arranged in a preset receiving groove (12) between the two long sides of the backplane (1), and one end of the bracket assembly (4) is movably connected to the frame (2) for adjusting the angle of its expansion relative to the backplane (1); Wherein, a first perovskite solar cell (5) is arranged on the periphery of the bracket assembly (4), and the first perovskite solar cell (5) adjusts the received light intensity through the angle adjustment of the bracket assembly (4) relative to the backplane (1), and the first perovskite solar cell (5) is electrically connected to a charging interface (6) arranged on the backplane (1) for charging the mobile phone.

2. The mobile phone case with a perovskite solar cell and a bracket according to claim 1, wherein, A second perovskite solar cell (7) is covered and arranged on the outer surface of the backplane (1) and around the first window (11) and the receiving groove (12), and the second perovskite solar cell (7) is connected to the first perovskite solar cell (5) to form a series circuit or a parallel circuit.

3. The mobile phone case with a perovskite solar cell and a bracket according to claim 2, wherein The bracket assembly (4) includes a bracket body (41) and a hinge structure (42). A substrate (8) is connected to the upper part of the circumference of the bracket body (41). The first perovskite solar cell (5) is foldably arranged on the substrate (8). One end of the bracket body (41) is movably connected to the frame (2) through the hinge structure (42); Wherein, when the bracket assembly (4) is completely folded up, the bracket body (41) is embedded in the receiving groove (12) opened on the backplane (1), and a notch (121) for facilitating the placement of the bracket body (41) is arranged on the edge of one end of the receiving groove (12) far from the hinge part (42).

4. The mobile phone case with a perovskite solar cell and a bracket according to claim 3, wherein, The hinge structure (42) includes a plurality of notches (421) equally spacedly opened at one end of the bracket body (41) and a convex tooth (422) inserted between any two adjacent notches (421). One end of the convex tooth (422) is fixedly connected to the frame (2), and after the other end is inserted into the notch (421), it is articulated through the insertion of a shaft pin for adjusting the angle of the first perovskite solar cell (5) to receive light intensity and the angle of the bracket body (41) expanding relative to the backplane (1).

5. The mobile phone case with a perovskite solar cell and a bracket according to claim 3, characterized in that, Also included is a scroll-type perovskite solar cell assembly (9). The scroll-type perovskite solar cell assembly (9) includes a receiving seat (91) fixedly arranged on the surface of the bracket body (41) and having a receiving cavity and a through-slit opening. A fixed rod (92), a return spring (93), a hollow scroll (94), and a third perovskite solar cell (95) are coaxially sleeved in the receiving cavity of the receiving seat (91) from the center outwards in sequence; One end of the reset spring (93) is fixed to the hollow reel (94), and the other end is fixed to the fixed rod (92); the third perovskite solar cell (95) is wound around the hollow reel (94), and the inner end of the third perovskite solar cell (95) is fixedly connected to the hollow reel (94), and the outer end extends out of a preset through-slit opening on the receiving seat (91).

6. The mobile phone case with a perovskite solar cell and a bracket according to claim 5, wherein, A pull tab is provided at the outer end of the third perovskite solar cell (95), and the pull tab is blocked outside the receiving seat (91) by the through-slit opening.

7. The mobile phone case with a perovskite solar cell and a bracket according to claim 5, characterized in that, An electrode connecting body is provided at one end of the third perovskite solar cell (95) located inside the receiving seat (91), and one end of the electrode connecting body passes through the receiving seat (91) and is connected to the first perovskite solar cell (5) to form a series circuit or a parallel circuit.

8. The mobile phone case with a perovskite solar cell and a bracket according to claim 5, wherein, The first perovskite solar cell (5), the second perovskite solar cell (7) and the third perovskite solar cell (95) are all flexible perovskite thin-film solar cells that can be folded and curled; Among them, the first perovskite solar cell (5) is stored on the substrate (8) by folding. The length and width of the substrate (8) are the same as those of the back plate (1), and a second viewing window (81) for exposing the mobile phone camera and the flash is provided on the substrate (8). When in use, the first perovskite solar cell (5) is unfolded to expand its power generation area; The second perovskite solar cell (7) is attached to the back plate (1). If the back plate (1) includes a curved surface, the second perovskite solar cell (7) should cover the entire back plate (1) including the curved surface.

9. The mobile phone case with a perovskite solar cell and a bracket according to claim 8, wherein The structures of the first perovskite solar cell (5), the second perovskite solar cell (7) and the third perovskite solar cell (95) all at least include a transparent conductive substrate, an electron transport layer, a perovskite layer, a hole transport layer and a metal electrode layer that are sequentially stacked from bottom to top; Among them, the transparent conductive substrate uses flexible glass with a thickness of 0.03 mm to 2 mm; The thickness of the electron transport layer is 20 nm to 50 nm; The thickness of the perovskite layer is 200 nm to 800 nm; The thickness of the hole transport layer is 50 nm to 200 nm; The thickness of the metal electrode layer is 80 nm to 150 nm; Alternatively, the positions of the electron transport layer and the hole transport layer are interchanged.

10. The mobile phone case with a perovskite solar cell and a bracket according to any one of claims 1 to 9, characterized in that, A charging hole (21) for exposing the mobile phone charging port, a card slot hole (22) for exposing the mobile phone card slot, and a button part (23) for placing and protecting the mobile phone buttons are provided on the frame (2); The back plate (1), the frame (2) and the connecting part (3) are all made of a plastic material with elasticity and damping force.

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