Fan-type perovskite solar mobile phone protection shell

Abstract

The utility model discloses a fan-type perovskite solar energy mobile phone protection shell, comprising a base plate, the front surface of the base plate is provided with a first groove for placing a mobile phone and a second groove adjacent to the first groove, the second groove is internally provided with a fan-shaped perovskite solar energy cell, the maximum central angle of opening the fan-shaped perovskite solar energy cell is 360 degrees, and the fan-shaped perovskite solar energy cell is provided with a fan-shaped perovskite solar energy cell. The end, away from the second groove, of the back of the bottom plate is provided with a third groove and an electric energy adaptation part matched with the third groove, the input end of the electric energy adaptation part is electrically connected with the fan-shaped perovskite solar cell, and the output end of the electric energy adaptation part is electrically connected with a mobile phone charging wire. According to the utility model, the sunward side of the solar cell is maximized, the efficiency of generating electric energy by the solar cell is improved, and the solar cell can block sunlight on the front side and the back side of the mobile phone in the charging process, so that the screen of the mobile phone and the back of the protective shell are prevented from being directly irradiated by sunlight.

Description

Technical Field

[0001] This utility model relates to the field of protective cases for electronic terminal devices, and in particular to a mobile phone protective case with a fan-shaped perovskite solar cell. Background Technology

[0002] With the rapid development of technology, intelligent electronic terminal devices are becoming increasingly popular, especially smartphones, which have become an indispensable part of our lives. Their emergence has not only changed people's lifestyles but also brought many conveniences to people's lives and work. However, due to their need for portability and compactness, they often lack large-capacity batteries or energy storage components, resulting in generally short usage or standby times that are difficult to meet the needs of continuous use for extended periods.

[0003] To overcome these inconveniences, people usually carry portable power banks to charge their phones when they go out. However, portable power banks are bulky and inconvenient to carry, and users must ensure they have enough power before leaving home, both of which contribute to a poor user experience. It is believed that they will gradually be phased out by the market in the near future.

[0004] According to industry statistics, over 80% of mobile phone users use phone cases. However, most existing phone cases only offer protection or decoration, and generally suffer from limited functionality and are not helpful in various usage scenarios. As a result, more and more mobile phone users have higher expectations for more practical phone cases. Therefore, some solar-powered phone cases have appeared on the market. For example, Chinese utility model patent CN218850822U discloses a phone case with solar charging functionality. However, this solar-powered phone case still suffers from small solar panel area and low charging efficiency. Furthermore, the solar panel heats up on the back of the phone case during charging, which can affect the phone's battery life.

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

[0006] To address the problems existing in the prior art, this utility model proposes a fan-shaped perovskite solar cell phone case, which maximizes the solar cell's solar-facing surface and improves the efficiency of solar cell power generation. At the same time, during charging, the solar cell can block sunlight from the front and back of the phone, preventing the phone screen and the back of the case from being directly exposed to sunlight.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This utility model proposes a fan-shaped perovskite solar cell phone case, including a base plate. The front of the base plate is provided with a first groove for placing the phone and an adjacent second groove. A fan-shaped perovskite solar cell is provided in the second groove. The maximum central angle of the fan-shaped perovskite solar cell is 360°. The back of the base plate is provided with a third groove and a power adapter that cooperates with it at the end away from the second groove. The input end of the power adapter is electrically connected to the fan-shaped perovskite solar cell, and the output end is electrically connected to the phone charging cable.

[0009] Specifically, the fan-shaped perovskite solar cell includes a fan surface, with fan arms connected to both sides of the fan surface. One fan arm is fixedly connected to a second groove, and the other fan arm is detachably connected to the back of the base plate after the fan-shaped perovskite solar cell is opened. A perovskite solar thin film battery is disposed on the surface of the fan surface facing away from the first groove.

[0010] Specifically, another arm of the fan-shaped perovskite solar cell is attracted to the back of the substrate by a magnetic field.

[0011] Specifically, another fan arm of the fan-shaped perovskite solar cell is attached to the back of the substrate by Velcro. The Velcro includes a barbed strip and a rounded strip. The barbed strip is disposed on the fan arm connected to the back of the substrate, and the rounded strip is disposed on the back of the substrate.

[0012] Specifically, the power adapter is embedded in the third groove and engages with the third groove.

[0013] Specifically, the end of the power adapter near the second groove is also hinged to the third groove.

[0014] Specifically, the power adapter includes a housing and a circuit board. The housing is embedded in the third groove, and the circuit board is located inside the housing. The circuit board is equipped with a charging control module. The input end of the charging control module is electrically connected to the fan-shaped perovskite solar cell through a wire, and the output end is electrically connected to the mobile phone charging cable.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] (1) The solar cell of this utility model adopts a fan shape, which is easy to store, and the maximum central angle after opening is 360°, which maximizes the solar cell's solar surface and significantly improves the efficiency of solar cell in generating electricity, thereby enabling fast charging of mobile phones.

[0017] (2) When the fan-shaped perovskite solar cell of this utility model is turned on for charging, one fan arm is fixedly connected to the second groove, and the other fan arm is connected to the back of the base plate after the fan-shaped perovskite solar cell is turned on. The fan surface is not attached to the protective shell. The heat generated by the solar cell when converting energy can be dissipated in time and will not be transferred to the mobile phone and affect the life of the mobile phone. At the same time, the fan surface can block the sunlight shining on the mobile phone screen and the back of the base plate to prevent it from affecting the screen display and to prevent the sun from shining directly on the back of the base plate and causing the base plate or power adapter to heat up. The heat of the base plate will transfer the heat to the mobile phone battery or power adapter. Therefore, the blocking of the fan surface is beneficial to extending the life of the mobile phone battery or power adapter. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the front structure of the base plate of this utility model;

[0020] Figure 2 This is a schematic diagram of the back structure of the base plate of this utility model;

[0021] Figure 3 This is a schematic diagram of the third groove structure of this utility model;

[0022] Figure 4 A schematic diagram of the structure for unfolding and charging the fan-shaped perovskite solar cell of this utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the power adapter part of this utility model as a support;

[0024] Reference numerals: 1. Base plate; 2. First groove; 3. Second groove; 4. Fan-shaped perovskite solar cell; 5. Third groove; 6. Power adapter. Detailed Implementation

[0025] The embodiments of the present invention will be described in detail below with reference to the examples. However, those skilled in the art will understand that the following examples are only for illustrating the present invention and should not be regarded as limiting the scope of the present invention.

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0027] Specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention can be implemented in many ways other than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Example 1

[0029] refer to Figures 1 to 4 This embodiment proposes a fan-shaped perovskite solar cell phone case, characterized by comprising a base plate 1. The front of the base plate 1 is provided with a first groove 2 for placing the phone and an adjacent second groove 3. The second groove 3 is provided with a fan-shaped perovskite solar cell 4, the maximum central angle of the fan-shaped perovskite solar cell 4 being 360°. The back of the base plate 1, away from the second groove 3, is provided with a third groove 5. The third groove 5 is embedded with a power adapter 6, which is snapped into the third groove 5. The input end of the power adapter 6 is electrically connected to the fan-shaped perovskite solar cell 4, and the output end is electrically connected to the phone charging cable.

[0030] In this embodiment, when the phone case is in use, the phone is placed in the first groove 2. When the phone does not need to be charged, the fan-shaped perovskite solar cell 4 is folded up and stored in the second groove 3 for easy carrying. When charging is needed, the phone charging cable plug is inserted into the phone charging port, the fan-shaped perovskite solar cell 4 is unfolded, and the phone angle is adjusted so that the fan-shaped perovskite solar cell 4 can receive solar energy to the maximum extent and convert solar energy into electrical energy to quickly charge the phone.

[0031] Specifically, the fan-shaped perovskite solar cell 4 includes a fan surface, with both sides of the fan surface connected to fan arms. One fan arm is fixedly connected to the end of the second groove 3 near the first groove 2, and the other movable fan arm is connected to the back of the base plate 1 via a magnetic field after the fan-shaped perovskite solar cell 4 is opened. A perovskite solar thin film battery is disposed on the surface of the fan surface facing away from the first groove 2.

[0032] In this embodiment, when the fan-shaped perovskite solar cell 4 is opened during charging, one fan arm is fixedly connected to the end of the second groove 3 near the first groove 2, and the other movable fan arm is connected to the back of the base plate 1. The perovskite solar thin film battery faces the sun, which can ensure the stability of the fan surface during the charging process. After charging is completed, the fan arm on the back of the base plate 1 is removed, and the fan surface is folded and stored in the second groove 3. In order to prevent the fan-shaped perovskite solar cell 4 from being exposed in the second groove 3, the movable fan arm can be detachably connected to the end of the second groove 3 away from the first groove 2 after storage.

[0033] The perovskite thin-film solar cell, taking a positive perovskite thin-film solar cell as an example, includes at least a transparent conductive substrate, an electron transport layer, a perovskite layer, a hole transport layer, and a metal electrode layer stacked sequentially from bottom to top. The transparent conductive substrate is made of flexible glass with a thickness of 0.03 mm to 2 mm. Preferably, a layer of pressed polymer plastic is attached to the outside, allowing the glass to bend without breaking. A transparent conductive material, including indium tin oxide (ITO) or fluorine-doped tin oxide (FTO), is deposited on the flexible glass, with a thickness of approximately 1 μm. The electron transport layer has a thickness of 20 nm to 50 nm; the perovskite layer has a thickness of 200 nm to 800 nm; the hole transport layer has a thickness of 50 nm to 200 nm; and the metal electrode layer has a thickness of 80 nm to 150 nm.

[0034] Specifically, the electron transport layer includes at least one of TiO2, SnO2, and methylfullerene (PCBM); the perovskite layer includes at least one of lead methylamine iodide (CH3NH3PbI3), lead methylamine bromide (CH3NH3PbBr3), lead cesium chloride (CsPbCl3), lead bromide (CsPbBr3), lead chlorobromide (CsPbBrxCl3-x), and lead sulfide (PbS); the hole transport layer includes poly(3,4-ethylenedioxythiophene):polystyrene. The cathode is a transparent conductive oxide electrode used to collect mobile free electrons, including at least one of titanium oxide (TiO2), zinc oxide (ZnO) and vanadium oxide (V2O5); the anode is a metal electrode used to collect mobile free holes, including at least one of gold, aluminum, silver and copper. Preferably, the device further includes a first passivation layer, a second passivation layer, and an outer protective layer. The first passivation layer comprises at least one of the following: diamino 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 comprises at least one of the following: 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.

[0035] Furthermore, the fabrication process of the perovskite thin-film solar cell in this embodiment of the invention is as follows:

[0036] 1) Preparation of perovskite thin films

[0037] First, prepare the perovskite material. Specifically, lead methylamine iodide (CH3NH3PbI3) can be selected as the perovskite material. This is an organic-inorganic hybrid semiconductor material with high light absorption coefficient and carrier mobility. Next, prepare the perovskite thin film: First, dissolve lead methylamine iodide in a mixed solution of dimethyl sulfoxide (DMSO) and γ-butyrolactone (GBL) to prepare a precursor solution with a concentration of 1.0M–1.5M. Then, spin-coat the precursor solution onto a pre-cleaned glass substrate at a speed of 2800 rpm–3200 rpm for 25–35 seconds. Finally, anneal the spin-coated sample on a hot plate at 90–110°C for 8–12 minutes to form the perovskite thin film.

[0038] 2) Preparation of perovskite solar cells

[0039] First, a gold layer with a thickness of 90 nm to 110 nm is vacuum-deposited on a substrate as an anode. Then, a poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) layer with a thickness of 45 nm to 55 nm is spin-coated onto the anode as a hole transport layer. Next, a perovskite thin film is introduced onto the hole transport layer. A PCBM layer with a thickness of 180 nm to 220 nm is spin-coated onto the perovskite thin film as an electron transport layer. Finally, an aluminum layer with a thickness of 90 nm to 110 nm is vacuum-deposited onto the electron transport layer as a cathode, forming a perovskite thin-film solar cell. Among them, methyl [6,6]-phenyl C61 butyrate (PCBM) is a methyl fullerene, which has a higher solubility in organic solvents than fullerene (C60). PCBM is an N-type semiconductor with high electron mobility and is the preferred electron transport material.

[0040] 3) Test the performance of perovskite solar thin-film cells and form modules.

[0041] First, the photoelectric performance of the cells is tested using a solar simulator, including open-circuit voltage, short-circuit current, fill factor, and photoelectric conversion efficiency. Then, the mechanical performance of the cells is tested using a universal testing machine, including bending strength, folding angle, and cutting accuracy. Next, the environmental adaptability of the cells is tested using an environmental testing chamber, including high temperature, low temperature, high humidity, and ultraviolet aging. Finally, the perovskite solar thin-film cells that meet the testing standards are cut and packaged to form perovskite solar modules.

[0042] Furthermore, the structure, materials, and parameters of the perovskite solar module enable it to maintain good photoelectric performance under bending, folding, and cutting conditions. Its design, fabrication, and optimization include, but are not limited to, material selection, structural design, and optimization of the carrier transport layer. Real-world crystals are susceptible to defects due to growth and post-processing. For example, the spin-coating and post-annealing processes in perovskite (PSC) devices create various defects on the surface or grain boundaries of polycrystalline perovskite crystals. Positively or negatively charged defects can introduce transition levels in the band gap, potentially leading to deep-level defects. This hinders carrier extraction and migration in the perovskite film and affects carrier lifetime, significantly impeding the improvement of VOC (open-circuit voltage) and fill factor (FF) in PSCs. Additionally, commonly used electron transport layer (ETL) and hole transport layer (HTL) materials also exhibit defects to varying degrees. This approach can improve the efficiency and stability of PSCs by passivating defects in each component, such as improving carrier extraction efficiency and VOC through energy level matching between the ETL / perovskite interface. Specific passivation strategies include, but are not limited to, interface treatment, introduction of additives, dopants and other technical means to improve the overall performance of PSCs.

[0043] More specifically, cystamine dihydrochloride (CMDR) with dual amino groups is introduced between the TiO2 ETL and the perovskite layer. The dual amino groups of CMDR can form TiN bonds with TiO2 and hydrogen bonds with I- in the perovskite, effectively suppressing the generation of excessive Pb0 defects in PbI2. Oxygen vacancies (VO) and hydroxyl defects on SnO2 ETL can impair the uniformity of the perovskite film. If the multifunctional amino acid L-aspartic acid (LAA) is used to regulate the SnO2 / perovskite interface, the -COOH in LAA can coordinate the mismatched Sn in SnO2. 4+ This reduces the VO defects of SnO2 and neutralizes the basicity of the side hydroxyl groups of SnO2. LAA (Laminated Acid Alternating Layer) can "connect" the SnO2 / perovskite interface through bilateral synergistic passivation, accelerating electron transfer at the interface and reducing the density of trapped states. Using multifunctional histidine as a SnO2 ETL / perovskite interface crosslinking agent promotes a tight crosslinking strategy between SnO2 and perovskite, which is beneficial for electron extraction and transfer, improves the quality of the perovskite film, and reduces non-radiative recombination at the interface. The crosslinking agent can also effectively adjust the interface energy levels, accelerating electron transfer.

[0044] Furthermore, for the pin structure: poly-4-vinylpyridine (P4VP) was introduced as an intermediate layer between the perovskite / [6,6]-phenyl-C61-butyrate (PCBM) interface to passivate defects located on the surface and grain boundaries. P4VP can effectively regulate the energy level matching of perovskite / PCBM, which is beneficial for efficient charge extraction at the interface and suppresses hole transfer. A passivation strategy based on a dual interface was adopted. On the basis of the already introduced ethylenediamine dihydroiodide (EDAI2) interface passivation layer, a hexamethylene diisocyanate (HDI) interface layer was introduced to further treat the perovskite / PCBM interface. After EDAI2 / HDI passivation, the perovskite / PCBM interface composite was significantly suppressed and an extremely low non-radiative VOC loss of 0.10V was obtained. The isocyanate groups in the HDI molecule can easily cross-link with the amine groups in EDAI2 even at room temperature. The cross-linked molecules are formed on the perovskite surface, which helps to inhibit EDA. 2+ The diffusion of cations into the perovskite results in excellent thermal stability of PSCs after EDAI2 / HDI passivation.

[0045] Furthermore, for nip-type PSCs: the interface passivation material must be directly deposited on the perovskite film, and the solvent for dissolving the interface passivation material must be an inert solvent that cannot damage the perovskite film. Halide anions or pseudohalide anions can react chemically with anionic vacancies or cation defects on the perovskite film surface through ionic bonds or hydrogen bonds, thereby increasing the crystallinity of the perovskite film. A tetrabutylammonium chloride (TBAC) monolayer was introduced at the perovskite / Spiro-OMeTAD interface using a simple solution method. When TBAC is deposited on the perovskite film, the Cl- ions in TBAC enter the perovskite lattice by occupying I- vacancies or acting as interstitials. This gives TBAC a strong interfacial dipole pointing towards the outer surface of the perovskite, promoting the built-in electric field while reducing the contact barrier for hole extraction. Coating the top of a perovskite layer with hexadecyltrimethylammonium hexafluorophosphate (HTAP) achieves a terminal sealing passivation strategy, which not only provides a good "channel" for hole extraction but also provides a defect passivation layer for enhanced VOCs and FF; PF in HTAP 6- It can fill halide anion vacancies on perovskite films and anchor uncoordinated Pb. 2+ This helps improve the crystallization and morphology of perovskite films; the sealing and passivation strategy also effectively alleviates the lead leakage problem.

[0046] Furthermore, when passivating the perovskite / HTL interface in a pin structure, poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) is one of the most commonly used HTL materials in planar pin-structured PSCs. Due to its high carrier mobility and high transmittance, NiOx has become a commonly used HTL in pin-structured PSCs besides PTAA. For example, an inorganic potassium fluoride (KF) interface buffer layer can be introduced onto the PTAA substrate to adjust the surface energy level difference at the PTAA HTL / perovskite interface. KF effectively reduces the valence band maximum of PTAA, which is beneficial for hole extraction and significantly increases the recombination resistance of the PTAA / perovskite interface, thereby suppressing interfacial carrier recombination. For example, a trimethylsulfonium bromide (TMSBr) interface layer can be introduced at the NiOx / perovskite interface using vapor deposition to eliminate the multi-step photodegradation of the NiOx-perovskite heterojunction during device fabrication. The formation of the PbI2 phase is suppressed by the redox reaction between NiOx and organic iodide salts, which is beneficial for the strain release and extraction of charge carriers at the NiOx / perovskite interface. The TMSBr interface layer also has lattice parameters that match the perovskite crystal and strong trap passivation capabilities.

[0047] Furthermore, additives are used to passivate defects in the perovskite light-absorbing layer, effectively suppressing SRH nonradiative recombination by improving carrier extraction and transport. Dopants are used to directly introduce passivating agents into the perovskite precursor solution, reducing the density of trapped states in the thin film and suppressing carrier nonradiative recombination. This passivation strategy carries the risk of introducing impurities into the perovskite crystal, which can affect the long-range ordered structure of the perovskite crystal. If the passivation sites are redirected to the carrier transport layer adjacent to the perovskite layer, dopant engineering by doping the carrier transport layer with elemental doping can promote carrier transport rate, regulate the energy level barrier between interfaces, further passivate perovskite film defects, control the crystallization process of the perovskite film, and improve crystallinity.

[0048] The perovskite solar cell implemented in this embodiment generates electricity using the photovoltaic effect of semiconductors. When N-type (electron-type semiconductor, i.e., impurity semiconductor with a much higher concentration of free electrons than holes) and P-type (hole-type semiconductor, i.e., semiconductor where positively charged holes are the primary conductors) semiconductors come into contact, diffusion occurs due to the difference in carrier concentration, generating a built-in electric field at the contact interface. Simultaneously, carriers drift under the influence of the electric field, and diffusion and drift reach a dynamic equilibrium, forming a PN junction. Under sunlight, the perovskite light-absorbing layer, which has a high absorption coefficient, absorbs a large number of photons with energy greater than or equal to the band gap, exciting electrons originally bound around the atomic nuclei to jump from the top of the valence band to the bottom of the conduction band. At the same time, to maintain electrical neutrality, an additional positively charged hole is generated. This electron-hole pair bound by Coulomb forces is called an exciton. Because perovskite has a low exciton binding energy, it rapidly dissociates into free electrons and holes under the influence of a built-in electric field. The free electrons are transported to the cathode through the electron transport layer (ETL) and are finally collected by the transparent conductive oxide (TCO) electrode. The free holes are transported to the anode through the hole transport layer (HTL) and are subsequently collected by the metal electrode. After the external mobile phone circuit is connected to the electrodes at both ends, the component forms a current loop, thereby realizing photoelectric conversion and supplying electrical energy to the mobile phone and its battery.

[0049] Specifically, the power adapter 6 includes a housing and a circuit board. The housing is embedded in the third groove 5, and the circuit board is located inside the housing. The circuit board is equipped with a charging control module. The input end of the charging control module is electrically connected to the fan-shaped perovskite solar cell 4 through a wire. The wire connecting the charging control module and the fan-shaped perovskite solar cell 4 can pass between them or be exposed. The output end of the charging control module is electrically connected to the mobile phone charging cable.

[0050] Example 2

[0051] refer to Figure 3 and Figure 5 The difference between this embodiment and embodiment 1 is that the movable fan arm of the fan-shaped perovskite solar cell 4 is bonded to the back of the base plate 1 by Velcro. The Velcro includes a barbed strip and a round strip. The barbed strip is set on the movable fan arm, and the round strip is correspondingly set on the back of the base plate 1. The end of the power adapter 6 near the second groove 3 is also hinged to the third groove 5.

[0052] In this embodiment, the end of the power adapter 6 near the second groove 3 is also hinged to the third groove 5. The power adapter 6 can rotate around the hinge position and be used as a mobile phone stand. When support is needed, the power adapter 6 can be rotated out. When not needed, the power adapter 6 can be rotated and stored into the third groove 5. If charging is required while supporting, the mobile phone can be supported on an object with space in the middle, leaving the mobile phone charging port empty, which does not affect the charging of the mobile phone.

[0053] Although this specification has described the present invention in detail with general description and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A fan-shaped perovskite solar cell phone case, characterized in that, The device includes a base plate (1), on the front of which is provided a first groove (2) for placing a mobile phone and a second groove (3) adjacent to it. A fan-shaped perovskite solar cell (4) is provided in the second groove (3). The maximum central angle of the fan-shaped perovskite solar cell (4) is 360°. A third groove (5) and a power adapter (6) are provided on the back of the base plate (1) away from the second groove (3). The input end of the power adapter (6) is electrically connected to the fan-shaped perovskite solar cell (4), and the output end is electrically connected to the mobile phone charging cable.

2. The fan-shaped perovskite solar cell phone case according to claim 1, characterized in that, The fan-shaped perovskite solar cell (4) includes a fan surface, with fan arms connected to both sides of the fan surface. One fan arm is fixedly connected to the second groove (3), and the other fan arm is detachably connected to the back of the base plate (1) after the fan-shaped perovskite solar cell (4) is opened. A perovskite solar thin film battery is provided on the surface of the fan surface facing away from the first groove (2).

3. A fan-shaped perovskite solar cell phone case according to claim 2, characterized in that, Another fan arm of the fan-shaped perovskite solar cell (4) is attracted to the back of the base plate (1) by a magnetic field.

4. A fan-shaped perovskite solar cell phone case according to claim 2, characterized in that, Another fan arm of the fan-shaped perovskite solar cell (4) is attached to the back of the base plate (1) by Velcro. The Velcro includes a barbed strip and a rounded strip. The barbed strip is set on the fan arm connected to the back of the base plate (1), and the rounded strip is correspondingly set on the back of the base plate (1).

5. A fan-shaped perovskite solar cell phone case according to claim 1, characterized in that, The power adapter (6) is embedded in the third groove (5) and engages with the third groove (5).

6. A fan-shaped perovskite solar cell phone case according to claim 5, characterized in that, The end of the power adapter (6) near the second groove (3) is also hinged to the third groove (5).

7. A fan-shaped perovskite solar cell phone case according to claim 1, characterized in that, The power adapter (6) includes a housing and a circuit board. The housing is embedded in the third groove (5), and the circuit board is located inside the housing. The circuit board is equipped with a charging control module. The input end of the charging control module is electrically connected to the fan-shaped perovskite solar cell (4) through a wire, and the output end is electrically connected to the mobile phone charging cable.

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