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Method for preparing large-area perovskite layer and perovskite solar cell

A solar cell and perovskite technology, applied in the field of solar cells, can solve the problems of many steps, poor repeatability, incomplete reaction, etc., and achieve the effects of uniform film formation, large grain size, and improved efficiency and stability.

Pending Publication Date: 2020-01-21
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used perovskite film solution preparation methods include one-step method and two-step method. The two-step method for preparing perovskite film is not suitable for large-scale preparation of perovskite due to its shortcomings such as many steps, incomplete reaction, and poor repeatability. film

Method used

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  • Method for preparing large-area perovskite layer and perovskite solar cell
  • Method for preparing large-area perovskite layer and perovskite solar cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment provides a perovskite solar cell, which is prepared according to the following steps:

[0031] On an FTO glass substrate with an area of ​​10cm×10cm, 40nm dense titanium dioxide was prepared by spray pyrolysis, and a mesoporous layer TiO with a thickness of 300nm was spin-coated 2 . Then spin-coat MAPbI 3 Precursor solution in which MAPbI is dissolved 3 The solvent of the precursor is a mixed solvent of DMSO and DMF. A mixed anti-solvent of toluene and ethyl acetate (toluene: ethyl acetate volume ratio = 1:1) was added dropwise 15 seconds before the end of spin coating, and annealed at 100°C for 30 minutes to obtain a thickness of 500nm dense perovskite film. Mix graphite, carbon black, polymethyl methacrylate, and isopropanol to form a carbon slurry, and scrape-coat the carbon slurry on the perovskite film prepared above as a carbon electrode to prepare a carbon electrode perovskite solar energy Battery.

Embodiment 2

[0037]In order to study the influence of different solvent ratios in the mixed anti-solvent formed by two solvents on the performance of the formed device, this example provides a series of carbon electrode perovskite solar cells. The preparation steps are the same as in Example 1, except that acetic acid is used The volume ratios of EA in the mixed anti-solvent formed by ethyl ester (EA) and toluene (Tol) were 0, 0.2, 0.4, 0.5, 0.6, 0.8 and 1.0, respectively.

[0038] The prepared series of carbon-based solar cells were tested, and the photoelectric conversion efficiency (PCE), short-circuit current density (J SC ), the open circuit voltage (Voc) and the fill factor (FF) vary with the volume ratio of EA (EA / (EA+Tol)) as follows figure 2 shown, from figure 2 It can be seen that, compared with the use of a single solvent (ie, EA / (EA+Tol) is 0.0 or 1.0), the photoelectricity of the carbon electrode perovskite solar cell formed by increasing or decreasing the volume ratio of E...

Embodiment 3

[0040] On an FTO glass substrate with an area of ​​10cm×10cm, 40nm dense titanium dioxide was prepared by spray pyrolysis, and a mesoporous layer TiO with a thickness of 300nm was spin-coated 2 . Then spin-coat MAPbI 3 Precursor solution in which MAPbI is dissolved 3 The solvent of the precursor is a mixed solvent of DMSO and DMF. 15s before the end of the spin coating, a mixed anti-solvent of chlorobenzene and ethyl acetate (chlorobenzene:ethyl acetate volume ratio = 5:1) is added dropwise, and annealed at 100°C for 30 minutes to obtain Dense perovskite films with a thickness of 500 nm. Mix graphite, carbon black, polymethyl methacrylate, and isopropanol to form a carbon slurry, and scrape-coat the carbon slurry on the perovskite film prepared above as a carbon electrode to prepare a carbon electrode perovskite solar energy Battery.

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Abstract

The invention discloses a method for preparing a large-area perovskite layer and a perovskite solar cell. The method comprises the following steps of coating a perovskite precursor solution on a substrate to form a perovskite precursor layer; adding a mixed anti-solvent, and carrying out annealing treatment to obtain the perovskite layer, wherein the mixed anti-solvent is a mixed solvent formed bymixing a solvent A and a solvent B; the solvent A is selected from any one of methylbenzene, chlorobenzene, dichloromethane, ethyl acetate, anisole and diethyl ether, the solvent B is selected from any one of methylbenzene, chlorobenzene, dichloromethane, ethyl acetate, anisole and monohydric alcohol with 3-6 carbon atoms, the solvent A and the solvent B are different, and a volume ratio of the solvent A to the mixed anti-solvent is 10%-90%. In the invention, a supersaturation degree of the perovskite precursor solution in a crystallization process is reduced by using the mixed anti-solvent so that crystallization nucleation sites are uniformly generated, the perovskite thin film with uniform film formation and a large grain size is finally obtained, and a good application prospect is possessed in the field of preparation of large-area perovskite devices.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a method for preparing a large-area perovskite layer and a perovskite solar cell. Background technique [0002] Solar energy is a renewable clean energy, and the development of high-efficiency and low-cost solar cells has become an effective means for people to make full use of solar energy. Due to the mature preparation process, silicon-based solar cells have been widely used in the market and occupy a dominant position in the market. However, due to the high energy consumption and high-cost preparation process of silicon-based solar cells, the development of high-efficiency and low-cost new thin-film solar cells has become an urgent demand in the market. [0003] Perovskite solar cells utilizing organometallic halide semiconductors as light-absorbing materials have attracted extensive research interest due to their excellent carrier mobility, high absorption coefficient, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/42H01L51/46H01L51/48
CPCH10K71/12H10K71/441H10K85/30H10K30/152H10K30/15H10K30/151H10K2102/00Y02E10/549
Inventor 杨世和郑世昭娄凌云刘通发
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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