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Presented in this work are the results of our study of the photoelectricproperties of perovskite $CH_3NH_3PbI_{2.98}Cl_{0.02}$ films deposited on aglass substrate using the spin-coating method. The unit cell parameters of theperovskite are determined using x-ray diffractometry. It is shown that the filmmorphology represents a net of non-oriented needle-like structures withsignificant roughness and porosity. In order to investigate the properties ofthe films obtained, non-contact methods were used, such as transmission andreflection measurements and the measurements of the spectral characteristics ofthe small-signal surface photovoltage. The method of spectral characteristicsof the low-signal surface photovoltage and the transmission method revealinformation about the external quantum yield in the films studied and about thediffusion length of minority carriers in the perovskite films. As a result ofthis analysis, it has been established that the films obtained are naturallytextured, and their bandgap is 1.59 eV. It is shown that in order to correctlydetermine absorption coefficient and the bandgap values, Urbach effect shouldbe accounted for. Minority carriers' diffusion length is longer than the filmthickness, which is equal to 400 nm. The films obtained are promising materialsfor solar cells.

Synthesis and investigation of the properties of organic-inorganic perovskite films with non-contact optical methods