Quantitative Analysis of the Doping and Defect Density in Mixed Sn-Pb Perovskites Mediated by SnF₂.

ABSTRACT: Last year's mixed Sn-Pb perovskites have been applied as low-bandgap absorbers in efficient solar cells. However, the performance is still limited by tin oxidation, resulting in doping and defects. Here we perform a quantitative analysis on how tin oxidation affects the optoelectronic properties of spin-coated Cs_0.25FA_0.75Sn_0.5Pb_0.5I₃ with varying SnF₂ additions ranging from 0 to 20 mol %. First, optical spectroscopy is used to determine the fraction of Sn⁴⁺ in the spin-coating solution, which varies depending on the purity of the starting SnI₂ precursor. By applying steady-state microwave conductance, a large decrease in the dark conductivity from ∼100 to <∼1 S m^-1 in the spin-coated films o

SUBMITTER: Nespoli J 

PROVIDER: S-EPMC12529774 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature