Reel type perovskite solar mobile power supply

Abstract

The utility model belongs to the technical field of solar mobile power supplies, and particularly relates to a reel type perovskite solar mobile power supply. According to the utility model, the perovskite solar cell body is wound on the hollow reel, and the perovskite solar cell body is drawn out and unfolded during use, so that the light receiving area of the perovskite solar cell body is enlarged, the power generation of the solar cell in the scheme is ensured, and a safe and reliable power supply is provided for a user outdoors; the perovskite solar cell body is stored or unfolded in a reel mode, the overall size of the mobile power supply is reduced, and the perovskite solar mobile power supply achieves the purposes of power generation, high-capacity power storage and long-time discharge output. And after the storage battery is installed, the perovskite solar mobile power supply can be used in the absence of sunlight, and the application range of the device is widened.

Description

TECHNICAL FIELD

[0001] The utility model belongs to solar mobile power supply technical field, concretely relates to a reel type perovskite solar mobile power supply. BACKGROUND

[0002] Electronic equipment has become an indispensable part of people's life, such as mobile phones are no longer limited to communication functions, and various work, entertainment application functions are integrated. However, due to the design requirements of its lightness, electronic equipment is often difficult to have a large capacity battery or energy storage component, resulting in a short standby time of the device, which is difficult to meet the use for a long time.

[0003] Some existing solutions are mainly optimized by solving single problem ideas, such as improving the energy density of the battery, or developing new energy storage technology to improve the standby time and endurance of the device, or through auxiliary components such as power banks or mobile power supplies; At the same time, there are also some products with only small area solar cells. However, the existing technical solutions still have some problems and limitations: first, increasing the energy density of the battery often increases the weight and volume of the device, affecting the portability of the device; second, there is no device that comprehensively solves the problems of portability, reel storage, long endurance, solar charging, etc.

[0004] Therefore, these conditions still lack high-power, long-endurance, and rechargeable power banks or mobile power supplies on the market, which cannot truly and effectively solve the problem of making users feel at ease using electronic equipment in natural environments and far from power sources.

[0005] Therefore, the utility model is proposed. UTILITY MODEL CONTENT

[0006] The utility model aims at overcoming the above-mentioned defects of prior art, and provides a reel type perovskite solar mobile power supply.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0008] A reel type perovskite solar mobile power supply, comprising: a reel, a hollow reel for winding a perovskite solar cell body is sleeved in the reel, a circuit assembly and a storage battery are arranged in the hollow reel, the perovskite solar cell body and the storage battery are electrically connected with the circuit assembly; the capacity of the storage battery is not less than 30000mAh;

[0009] The winding drum is also provided with a charging part for charging the device to be charged and electrically connected with the circuit assembly, and a long slot is also formed in the axial direction of the winding drum to facilitate the extraction of the perovskite solar cell body.

[0010] One end of the hollow winding shaft is provided with a driving part for rotating the hollow winding shaft, and the driving part is also connected with the winding drum.

[0011] Specifically, the winding drum is provided with a groove for placing and supporting the device to be charged.

[0012] Specifically, the charging part includes a charging head, which is arranged in the groove at a position facilitating the charging of the device to be charged.

[0013] Specifically, the winding drum is provided with a support part at both ends to prevent the perovskite solar mobile power supply from rolling, the support part includes a fixed end and a movable end close to or away from the winding drum, and the winding drum is provided with a groove hinged to the fixed end.

[0014] Specifically, one side of the winding drum outside the long slot is provided with a display for displaying the charging capacity and state.

[0015] Specifically, the cover is also provided with a USB interface connected with the battery through the circuit assembly.

[0016] Specifically, the cover is provided with a second button for controlling the charging and discharging of the charging part, and the second button is electrically connected with the circuit assembly.

[0017] Specifically, the driving part includes an outer ring fixedly connected with the winding drum and an inner ring fixedly connected with the hollow winding shaft.

[0018] Specifically, the driving part is fixedly provided with a driving motor for driving the hollow winding shaft to rotate, and the driving part is also provided with a first button for controlling the forward and reverse rotation of the driving motor, and the driving motor and the first button are electrically connected with the circuit assembly.

[0019] Specifically, the winding drum type perovskite solar mobile power supply also includes a winding mechanism, the winding mechanism includes a ratchet wheel, a ratchet and a winding spring, the stationary end of the winding spring is fixedly arranged in the winding drum, the rotating end of the winding spring is fixedly arranged on the hollow winding shaft, the ratchet wheel is also fixedly connected with the hollow winding shaft, the ratchet is fixedly arranged in the driving part, and the driving part is provided with a first button for controlling the release of the potential energy of the winding spring, so that the perovskite solar cell body can be automatically wound onto the hollow winding shaft after being extracted from the winding drum.

[0020] Specifically, the perovskite solar cell body includes a perovskite solar thin film cell, the perovskite solar thin film cell includes a light absorption layer, an electron transport layer, a hole transport layer, a cathode electrode layer, and an anode electrode layer; the perovskite solar thin film cell is a flexible thin film with a thickness less than 1 mm, and a bending radius less than 3 mm.

[0021] Specifically, the light absorption layer includes but is not limited to at least one of methylamine lead iodide (CH3NH3PbI3), methylamine lead bromide (CH3NH3PbBr3), cesium lead chloride (CsPbCl3), lead bromide (CsPbBr3), lead chloride bromide (CsPbBrxCl 3-x ), lead sulfide (PbS);

[0022] The electron transport layer includes but is not limited to at least one of TiO2, SnO2, and methyl fullerene (PCBM);

[0023] The hole transport layer includes but is not limited to at least one of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS), poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA), NiOx, and Spiro-OMeTAD;

[0024] The cathode electrode layer is a transparent conductive oxide electrode for collecting moving free electrons, and includes but is not limited to at least one of titanium oxide (TiO2), zinc oxide (ZnO), and vanadium oxide (V2O5);

[0025] The anode electrode layer is a metal electrode for collecting moving free holes, and includes but is not limited to at least one of gold, aluminum, silver, and copper.

[0026] Specifically, the perovskite solar thin film cell further has at least one of a first passivation layer, a second passivation layer, and an outer surface protection layer;

[0027] The first passivation layer includes but is not limited to at least one of diamino cystamine dihydrochloride (CMDR), amino acid L-aspartic acid (LAA), histidine (Histidine), poly-4-vinylpyridine (P4VP), ethylenediamine dihydroiodide (EDAI2), and hexamethylene diisocyanate (HDI);

[0028] The second passivation layer includes but is not limited to at least one of tetrabutylammonium chloride (TBAC), hexadecyltrimethylammonium hexafluorophosphate (HTAP), inorganic potassium fluoride (KF), and trimethylsulfonium bromide (TMSBr);

[0029] The outer surface protection layer includes but is not limited to plastic.

[0030] Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

[0031] The perovskite solar mobile power supply of the utility model expands the light receiving area of the perovskite solar cell body by winding the perovskite solar cell body on the hollow reel and expanding the perovskite solar cell body by the driving part when in use, guarantees the high-power power generation of the solar cell, improves the endurance of the mobile power supply by arranging the storage battery in the reel, and enables the user to charge at any time, thereby providing a safe and reliable power supply for the user outdoors;

[0032] Further, the storage battery is arranged in the cavity of the hollow reel, the overall structure is compact, the overall size of the hollow reel type flexible perovskite solar cell is reduced, and the perovskite solar mobile power supply is convenient to carry; the perovskite solar cell body is wound or expanded, the overall size of the mobile power supply is reduced, and the perovskite solar mobile power supply realizes the target of high-power power generation, high-capacity power storage and long-time power output;

[0033] Moreover, the perovskite solar mobile power supply can be used without sunlight after the storage battery is installed, and the application range of the device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0034] The drawings incorporated into the specification and forming a part of the specification, together with the specification, serve to explain the principle of the utility model.

[0035] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced as follows, and obviously, other drawings can be obtained by the drawings without creative labor for those skilled in the art.

[0036] Figure 1 It is the first perspective view of the utility model;

[0037] Figure 2 It is the second perspective view of the utility model;

[0038] Figure 3 It is the top view of the utility model;

[0039] Figure 4 It is the B-B sectional view of the utility model; Figure 3

[0040] Figure 5 It is the charging schematic view of the equipment to be charged of the utility model.

[0041] ​Wherein: 1 is a winding drum; 2 is a hollow reel; 3 is a perovskite solar cell body; 4 is a charging part; 5 is a driving part; 6 is a cover; 7 is a groove; 8 is a supporting part; 9 is a stop lever; 10 is a display; 11 is a circuit assembly; 12 is a storage battery; 13 is a device to be charged; 14 is a first button; 15 is a second button. DETAILED DESCRIPTION

[0042] The exemplary embodiments will be described in detail herein below with reference to the accompanying drawings. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present application. Rather, they are merely examples consistent with some aspects of the present application as detailed in the appended claims.

[0043] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0044] Embodiment 1

[0045] The embodiment provides a reel type perovskite solar mobile power supply, comprising: a winding drum 1, a hollow reel 2 for winding a perovskite solar cell body 3 is sleeved in the winding drum 1, a circuit assembly 11 and a storage battery 12 are arranged in the hollow reel 2, the perovskite solar cell body 3 and the storage battery 12 are electrically connected with the circuit assembly 11; the capacity of the storage battery 12 is 30000mAh;

[0046] The circuit assembly 11 can be a circuit board, an integrated circuit or other forms of electronic, circuit component circuit system, and the circuit board is taken as the representative of the circuit assembly 11 hereinafter; the storage battery can be matched with lithium batteries, lead-acid batteries, ternary material batteries or other batteries according to the volume shape.

[0047] A charging part 4 for charging the device to be charged 13 and electrically connected with the circuit board is further arranged on the winding drum 1, and a long slot for facilitating the extraction of the perovskite solar cell body 3 is further arranged on the axial direction of the winding drum 1; a stop lever 9 for facilitating the extraction is further arranged at the end of the perovskite solar cell body 3 away from the winding drum 1; see Figures 1-3 ;

[0048] The size of the perovskite solar mobile power supply can be: the reel length is 1000mm, the extraction length of the perovskite solar cell body 3 is 1000mm, the reel length is 200mm, the extraction length of the perovskite solar cell body 3 is 200mm, the reel length is 200mm, and the extraction length of the perovskite solar cell body 3 is 1000mm, and the specific size is not limited by the above data, and can be designed according to the actual situation.

[0049] One end of the hollow spool 2 is provided with a drive unit 5 for rotating it, and the drive unit 5 is also connected to the spool 1; a cover 6 is fixedly provided at the end of the spool 1 away from the drive unit 5, and the cover 6 is rotatably supported by the hollow spool 2; see also Figures 4-5 As shown.

[0050] Furthermore, a groove 7 for placing and supporting the device 13 to be charged is provided on the drum 1 along its axial direction; see also Figures 1-2 As shown.

[0051] Furthermore, the charging unit 4 includes a charging head, which is disposed in the groove 7 at a position that facilitates charging of the device 13 to be charged.

[0052] Furthermore, a display 10 is provided on the outside of the reel 1 and on the side near the elongated groove to facilitate displaying the charging power and status; see also Figures 2-3 As shown.

[0053] Furthermore, the cover 6 is also provided with a USB interface that is connected to the battery 12 via a circuit board.

[0054] Furthermore, the cover 6 is provided with a second button 15 for controlling the charging and discharging of the charging unit 4, and the second button 15 is electrically connected to the circuit board.

[0055] Furthermore, the drive unit 5 includes an outer ring that is rotatably fixed to the drum 1 and an inner ring that is fixedly connected to the hollow spool 2; when the drive unit 5 is rotated, the outer ring rotates relative to the drum 1, and the inner ring drives the hollow spool 2 to rotate together with the drive unit 5.

[0056] Furthermore, the perovskite solar cell body 3 includes a perovskite solar thin-film battery, which includes a light-absorbing layer, an electron transport layer, a hole transport layer, a cathode electrode layer, and an anode electrode layer; the perovskite solar thin-film battery is a flexible film with a thickness of less than 1 mm and a bending radius of less than 3 mm.

[0057] Furthermore, the light-absorbing layer includes, but is not limited to: lead methylamine iodide (CH3NH3PbI3), lead methylamine bromide (CH3NH3PbBr3), lead cesium chloride (CsPbCl3), lead bromide (CsPbBr3), and lead chlorobromide (CsPbBrxCl3). 3-x At least one of lead sulfide (PbS);

[0058] The electron transport layer includes, but is not limited to, at least one of: TiO2, SnO2, and methylfullerene (PCBM);

[0059] The hole transport layer comprises, but is not limited to, at least one of: poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS), poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA), NiOx, and Spiro-OMeTAD;

[0060] The cathode electrode layer is a transparent conductive oxide electrode used to collect mobile free electrons, including but not limited to at least one of titanium oxide (TiO2), zinc oxide (ZnO) and vanadium oxide (V2O5);

[0061] The anode electrode layer is a metal electrode used to collect moving free holes, including but not limited to at least one of gold, aluminum, silver, and copper.

[0062] Furthermore, the perovskite solar thin-film battery also has at least one of a first passivation layer, a second passivation layer, and an outer protective layer;

[0063] The first passivation layer comprises, but is not limited to, at least one of the following: cystamine dihydrochloride (CMDR), amino acid L-aspartic acid (LAA), histidine, poly-4-vinylpyridine (P4VP), ethylenediamine dihydroiodide (EDAI2), and hexamethylene diisocyanate (HDI).

[0064] The second passivation layer comprises, but is not limited to, at least one of: tetrabutylammonium chloride (TBAC), hexadecyltrimethylammonium hexafluorophosphate (HTAP), inorganic potassium fluoride (KF), and trimethylsulfonium bromide (TMSBr);

[0065] The outer protective layer includes, but is not limited to, plastic.

[0066] Example 2

[0067] The difference between this embodiment and embodiment 1 is that the drive unit 5 is equipped with a drive motor for driving the hollow spool 2 to rotate, and the drive unit 5 is also equipped with a first button 14 for controlling the forward and reverse rotation of the drive motor. The drive motor and the first button 14 are both electrically connected to the circuit board.

[0068] Example 3

[0069] The difference between this embodiment and Embodiment 1 is that the roll-type perovskite solar power bank also includes a rewind mechanism. The rewind mechanism includes a ratchet, a ratchet tooth, and a coil spring. The stationary end of the coil spring is fixedly disposed inside the roll 1, and the rotating end of the coil spring is fixedly disposed on the hollow roll 2. The ratchet is also fixedly connected to the hollow roll 2, and the ratchet tooth is fixedly disposed inside the drive unit 5. The drive unit 5 is provided with a first button 14 for controlling the ratchet tooth to release the potential energy of the coil spring, so that after the perovskite solar cell body 3 is pulled out of the roll 1, pressing the first button 14 can automatically rewind it back onto the hollow roll 2.

[0070] Example 4

[0071] The difference between this embodiment and Embodiment 1 is that both ends of the reel 1 are provided with support portions 8 to prevent the perovskite solar power bank from rolling. Each support portion 8 includes a fixed end and a movable end that rotates around the fixed end to move closer to or away from the reel 1. The reel 1 has a circumferential groove that hinges to the fixed end. See [link to previous embodiment]. Figure 1 As shown.

[0072] Example 5

[0073] The difference between this embodiment and embodiment 1 is that the charging unit 4 includes a rotating disk, a charging cable, and a charging head. One end of the charging cable is electrically connected to the circuit board, and the other end is electrically connected to the charging head. The drum 1 has a hole for the charging cable to pass through, so that the charging head is exposed outside the drum 1. The rotating disk is located inside the drum 1 and on the side away from the rotating part. The charging cable is wound on the rotating disk, so that the charging head can be pulled out a certain distance the first time to meet the charging distance requirement. The charging head is pulled a second time to rewind the charging cable onto the rotating disk to meet the storage of the charging cable.

[0074] On the other hand, this embodiment also provides a fabrication process for perovskite solar cells, specifically including the following steps:

[0075] Step 1: Preparation of perovskite thin films

[0076] First, prepare the perovskite material. Specifically, lead methylamine iodide (CH3NH3PbI3) can be chosen 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 1.5M precursor solution. Then, spin-coat the precursor solution onto a pre-cleaned glass substrate at 3000 rpm for 30 seconds. Finally, anneal the spin-coated sample on a hot plate at 100°C for 10 minutes to form the perovskite thin film.

[0077] Step 2: Fabrication of perovskite solar cells

[0078] First, a 100 nm thick gold layer is vacuum-deposited on a substrate as the anode; then, a 50 nm thick poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) layer is spin-coated onto the anode as the hole transport layer; next, a perovskite thin film is introduced onto the hole transport layer; a 200 nm thick PCBM layer is spin-coated onto the perovskite thin film as the electron transport layer; finally, a 100 nm thick aluminum layer is vacuum-deposited onto the electron transport layer as the cathode, forming a perovskite thin-film solar cell; wherein, methyl [6,6]-phenyl C61 butyrate (PCBM) is a methyl fullerene, which has a higher solubility in organic solvents than fullerene (C 60 PCBM is an N-type semiconductor with high electron mobility, making it the preferred material for electron transport.

[0079] Step 3: Test the performance of the perovskite solar cell and form the module.

[0080] 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 cells that meet the testing standards are cut and packaged to form perovskite solar modules.

[0081] Furthermore, the structure, materials, and parameters of the perovskite solar cell 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 the defects of each component. For example, it can improve carrier extraction efficiency and VOC by energy level matching between ETL perovskite interfaces. 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.

[0082] 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 crosslinking agent for the SnO2ETL perovskite interface 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.

[0083] Furthermore, for the pin structure: poly-4-vinylpyridine (P4VP) is introduced as an intermediate layer between the perovskite [6,6]-phenyl-C61-butyrate methyl ester (PCBM) interface to passivate defects located at the surface and grain boundaries. P4VP can effectively regulate the energy level matching of the perovskite PCBM, which is beneficial for efficient charge extraction at the interface and suppresses hole transfer. A passivation strategy based on a dual interface is adopted, and hexamethylene diisocyanate (EDAI2) is introduced on the basis of the already introduced ethylenediamine dihydroiodide (EDAI2) interface passivation layer. The HDI interface layer further treats the perovskite PCBM interface; after passivation with EDAI2 / HDI, the perovskite PCBM interface recombination is significantly suppressed and an extremely low non-radiative VOC loss of 0.10V is obtained; the isocyanate groups in the HDI molecule readily undergo cross-linking reactions with the amine groups in EDAI2 even at room temperature, and the cross-linked molecules form on the perovskite surface, which helps to prevent the diffusion of EDA2+ cations into the perovskite, resulting in excellent thermal stability of PSCs after EDAI2 / HDI passivation.

[0084] 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 anion 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 Spiro-OMeTAD interface of the perovskite 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.

[0085] Furthermore, when passivating the perovskite HTL interface in the pin structure, poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) is one of the most commonly used HTL materials for planar pin-structured PSCs; due to its high carrier mobility and high transmittance, NiO x High-level lattice structures (HTLs) have become commonly used in pin-structured PSCs, in addition to PTAA. For example, an inorganic potassium fluoride (KF) interface buffer layer is 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, facilitating hole extraction and significantly increasing the recombination resistance at the PTAA perovskite interface, thereby suppressing interfacial carrier recombination. Another example is the introduction of a trimethylsulfonium bromide (TMSBr) interface layer at the NiOx perovskite interface using vapor deposition to eliminate the multi-step photodegradation of the NiOx perovskite heterojunction during device fabrication. The redox reaction between NiOx and organic iodide salts suppresses the formation of the PbI2 phase, facilitating strain-induced carrier release and extraction at the NiOx perovskite interface. The TMSBr interface layer also possesses lattice parameters matching the perovskite crystal and strong trap passivation capabilities.

[0086] 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.

[0087] 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 electronic devices or batteries.

[0088] It should be noted that the specific dimensions of the roll-up perovskite solar power bank in this solution, such as the outer dimensions being like a folding umbrella, have portability, and like a non-folding umbrella, also have a certain degree of portability and mobility. The core of this solution is to disclose the inventive idea and structural details of the roll-up structure, the application of flexible perovskite solar cells, and the realization of the solar power bank in exchange for protection. The specific implementation dimensions are easy for those skilled in the art to set in combination with actual conditions, and are not specifically limited here.

[0089] The above description is merely a specific embodiment of this utility model, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this utility model.

[0090] It should be understood that this 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 this utility model is limited only by the appended claims.

Claims

1. A roll-type perovskite solar power bank, characterized in that, include: A reel (1) is provided with a hollow spool (2) for winding the perovskite solar cell body (3) inside the reel (1). The hollow spool (2) is provided with a circuit assembly (11) and a battery (12). The perovskite solar cell body (3) and the battery (12) are both electrically connected to the circuit assembly (11). The drum (1) is also provided with a charging part (4) for charging the device (13) to be charged and electrically connected to the circuit assembly (11), and a long groove is also provided along the axial direction of the drum (1) to facilitate the extraction of the perovskite solar cell body (3). One end of the hollow spool (2) is provided with a drive part (5) for rotating it, and the drive part (5) is also connected to the spool (1); a cover (6) is fixedly provided at the end of the spool (1) away from the drive part (5), and the cover (6) is rotatably supported by the hollow spool (2). The drum (1) has a groove (7) on its axial direction for placing and supporting the device (13) to be charged.

2. The reel-type perovskite solar power bank according to claim 1, characterized in that, Both ends of the reel (1) are provided with support parts (8) to prevent the perovskite solar power source from rolling. The support part (8) includes a fixed end and a movable end that rotates around the fixed end to approach or move away from the reel (1). The reel (1) is provided with a groove in the circumference that is hinged to the fixed end.

3. The reel-type perovskite solar power bank according to claim 1, characterized in that, A display (10) is provided on the outside of the drum (1) and on the side near the long groove to facilitate displaying the charging power and status.

4. The reel-type perovskite solar power bank according to claim 1, characterized in that, The cover (6) is also provided with a USB interface that is connected to the battery (12) via a circuit assembly (11).

5. The reel-type perovskite solar power bank according to claim 4, characterized in that, The cover (6) is provided with a second button (15) for controlling the charging and discharging of the charging unit (4), and the second button (15) is electrically connected to the circuit assembly (11).

6. The reel-type perovskite solar power bank according to claim 1, characterized in that, The drive unit (5) includes an outer ring that is rotatably fixed to the drum (1) and an inner ring that is fixedly connected to the hollow spool (2).

7. The reel-type perovskite solar power bank according to claim 6, characterized in that, The drive unit (5) is fixedly equipped with a drive motor for driving the hollow spool (2) to rotate. The drive unit (5) is also equipped with a first button (14) for controlling the forward and reverse rotation of the drive motor. The drive motor and the first button (14) are electrically connected to the circuit assembly (11).

8. The reel-type perovskite solar power bank according to claim 1, characterized in that, It also includes a rewinding mechanism, which includes a ratchet, a ratchet tooth, and a coil spring. The stationary end of the coil spring is fixedly disposed inside the drum (1), and the rotating end of the coil spring is fixedly disposed on the hollow spool (2). The ratchet is also fixedly connected to the hollow spool (2). The ratchet tooth is fixedly disposed inside the drive unit (5). The drive unit (5) is provided with a first button (14) for controlling the ratchet tooth to release the potential energy of the coil spring, so that the perovskite solar cell body (3) can be automatically rewound to the hollow spool (2) after being pulled out of the drum (1).

9. The reel-type perovskite solar power bank according to any one of claims 1-8, characterized in that, The perovskite solar cell body (3) includes a perovskite solar thin film battery, which includes a light-absorbing layer, an electron transport layer, a hole transport layer, a cathode electrode layer, and an anode electrode layer.

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