Method for improving light absorption layer of battery by using melamine as additive

The invention discloses a method for improving a light absorption layer of a battery by taking melamine as an additive, which comprises the following steps of: dissolving tin iodide, formamide, melamine and tin fluoride in a mixed solvent of DMF and DMSO in proportion to prepare a precursor solution, spin-coating the precursor solution on a hole transport layer for 30 seconds, dripping anti-solvent chlorobenzene after spin-coating for 12 seconds, and then performing annealing treatment to obtain the light absorption layer. Due to the reduction performance of melamine, Sn can be inhibited from being oxidized into Sn , the formation of Sn vacancies is reduced, the generation of defects such as pinholes in the surface of the perovskite thin film is prevented, the surface appearance of the perovskite thin film is improved, and the power conversion efficiency of the battery is improved; nitrogen ions in the chemical structure have lone pair electrons and can form coordinate bonds with Sn, so that the