Perovskite light absorption layer, preparation method of perovskite light absorption layer, solar cell and preparation method of solar cell

Abstract

The invention discloses a perovskite light absorption layer and a preparation method thereof, and a solar cell and a preparation method thereof. The preparation method of the perovskite light absorption layer comprises the following steps: 1) depositing a perovskite thin film on a substrate; 2) heating the perovskite thin film at 45-50 DEG C for 60-70 seconds, annealing the perovskite thin film at 280-320 DEG C for 60-70 seconds, and naturally cooling the perovskite thin film; and 3) annealing the perovskite thin film treated in the step 2) at the temperature of 60-120 DEG C for 10-20 minutes. According to the invention, secondary annealing treatment is carried out on the perovskite light absorption layer after high-temperature annealing and cooling, so that recrystallization of the polycrystalline perovskite thin film is promoted through Ostwald curing, the grain size of the perovskite thin film is increased, the crystallization performance of the perovskite thin film is improved, and the yield of the perovskite thin film is improved. The carrier non-radiative recombination loss of the solar cell containing the perovskite light absorption layer is significantly reduced, and the photoelectric conversion efficiency is significantly improved.

Description

technical field [0001] The invention relates to the technical field of solar cell devices, in particular to a perovskite light absorption layer and a preparation method thereof, a solar cell and a preparation method thereof. Background technique [0002] Perovskite materials have the advantages of large absorption coefficient, high carrier mobility, long electron-hole diffusion distance, and easy adjustment of the band gap. Moreover, there are abundant reserves of perovskite raw materials on the earth, low cost, and easy mass production. , has good commercial potential, therefore, perovskite solar cells have become a research hotspot in the field of photovoltaics. [0003] All-inorganic perovskite (CsPbX 3 , X is I or Br) does not contain organic components, has excellent thermal stability and high charge mobility, and has a wide band gap (1.7eV ~ 2.3eV), is an ideal front electrode material for tandem batteries . [0004] The intrinsic film quality of the perovskite ligh...

AI Technical Summary

Problems solved by technology

At present, organic small molecules are often added to the perovskite precursor solution to modify and passivate the perovskite film, which can reduce the defects inside and on the surface of the film, but excessive small organic molecules will also reduce the crystallization of the film. properties, and even affect the grain structure of perovskite

In addition, the method of organic small molecule modification is not universal and reproducible. The optimal concentration of organic small molecules varies greatly in different components of perovskite precursor solutions, and the thermal stability of organic small molecules Poor stability, these factors will limit the application of this method in the preparation of all-inorganic perovskite thin films

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