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Perovskite type solar cell based on cooperative post-processing of multiple ammonium salts and preparation method thereof

A solar cell, perovskite-type technology, applied in circuits, electrical components, photovoltaic power generation, etc., can solve the problems that perovskite films will not reach the film quality, reduce non-radiative recombination, etc., and improve the open circuit voltage and fill factor. , the effect of reducing non-radiative recombination and improving utilization

Active Publication Date: 2020-04-10
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the different molecular properties of the ammonium halide salt, the perovskite film after passivation often does not achieve the best film quality, so that a single ammonium halide salt cannot completely solve the problems existing in the perovskite film. Therefore, it is a key direction for the next step in the field of perovskite solar cells to solve the various defects in the film to further reduce the non-radiative recombination, so as to approach the S-Q theoretical limit of solar cell efficiency.

Method used

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  • Perovskite type solar cell based on cooperative post-processing of multiple ammonium salts and preparation method thereof
  • Perovskite type solar cell based on cooperative post-processing of multiple ammonium salts and preparation method thereof
  • Perovskite type solar cell based on cooperative post-processing of multiple ammonium salts and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] In the first step, use deionized water, acetone, optical glass cleaner, deionized water, and isopropanol to ultrasonically clean the FTO glass substrate (15Ω / □), dry it in an oven at 60°C for 4 hours, and then use 5 mg / mL TiO 2 Colloidal TiO 2 The colloidal quantum dots were spin-coated on the FTO substrate at 4000rpm, and the solvent used was deionized water. Subsequently, the substrate was heated and annealed at 150° C. for 30 minutes. After cooling, the TiO 2 The film substrate is transferred to a N-filled 2 glove box to fabricate the perovskite layer.

[0029] In the second step, the TiO 2 The film substrate is transferred to a N-filled 2 glove box to fabricate the perovskite layer. Equivalent amount of PbI 2 and CH 3 NH 3 I was co-dissolved in a mixed solvent of DMF:DMSO=4:1 (volume ratio) to make a precursor solution. After TiO 2 The substrate was spin-coated with the precursor solution, and 300 μL of chlorobenzene was added dropwise as an anti-solvent...

Embodiment 2

[0033] The first two steps are the same as in Example 1, and in the third step, the post-treatment solution composition is 2.5 mg of 2,2'-(ethylenedioxy)diethylamine hydrobromide (EDBEBr) dissolved in every milliliter of isopropanol. 2 ), 2.5 mg phenylammonium bromide (PhABr) and 5 mg guanidine thiocyanate (GuSCN). Then move to a hot stage for annealing at 100°C for 5 minutes to obtain a perovskite light-absorbing layer with gradient distribution of three ammonium salts. All the other steps are the same as in Example 1. The photoelectric conversion efficiency of such perovskite solar cells can reach 20%.

Embodiment 3

[0035] The first step is the same as in Example 1, and in the second step, the chemical composition of the precursor solution for preparing the perovskite layer is (FA 0.95 PB 2.95 ) 0.85 (MAPbBr 3 ) 0.15 . in TiO 2 The substrate was spin-coated with the precursor solution, and 300 μL of chlorobenzene was added dropwise as an anti-solvent during the spin-coating process. After the spin-coating was completed, it was moved to a hot stage for heating and annealing at 100°C for 30 minutes to form a film.

[0036] In the third step, the composition of the post-treatment solution is to dissolve 5 mg of guanidine hydrobromide (GABr) and 5 mg of phenethylammonium iodide (PEAI) per milliliter of isopropanol. Then move to the hot stage for annealing at 100°C for 5 minutes to obtain a perovskite light-absorbing layer with gradient distribution of three substances. All the other steps are the same as in Example 1. The photoelectric conversion efficiency of such perovskite solar cel...

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Abstract

The invention discloses a perovskite type solar cell based on cooperative post-processing of multiple ammonium salts and a preparation method thereof, a perovskite layer as a light absorption active layer is processed by a mixed solution of multiple ammonium salts after film formation, and non-radiative recombination in a thin film is inhibited in a passivation mode through the cooperative diffusion effect of the added various ammonium salts; and meanwhile, the distribution of different types of ammonium salts after permeation in the thin film also shows different gradient distribution, so that gradient optimization of the energy band structure of the thin film is realized, defect passivation of different gradients is realized, non-radiative recombination of photon-generated carriers is reduced, and finally, the open-circuit voltage and the filling factor of the device are improved. The perovskite solar cell which is subjected to aftertreatment through multiple ammonium salt mixed solutions has relatively high photoelectric conversion efficiency and good stability.

Description

technical field [0001] The invention belongs to the technical field of photoelectric functional materials and devices, and in particular relates to a perovskite solar cell based on the synergistic post-treatment of various ammonium salts and a preparation method thereof. Background technique [0002] With the rapid development of modern society, human demand for energy is increasing; although traditional fossil energy accounts for a large proportion of energy supply, it is easy to cause serious environmental pollution and is a non-renewable consumable, which seriously restricts With the sustainable development of economy and society, it is imminent to find clean and efficient renewable energy. As an emerging energy supply device in renewable energy, solar cells directly convert light energy into electrical energy through photochemical reactions or photovoltaic effects. The emergence of solar cells provides a very potential solution to solve and replace the use of fossil ener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/42H01L51/44H01L51/46H01L51/48
CPCH10K71/12H10K85/00H10K30/151H10K30/00H10K30/88Y02E10/549
Inventor 朱瑞富云齐杨晓宇赵丽宸龚旗煌
Owner PEKING UNIV
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