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The most promising lead‐free options for producing perovskite solar cells are tin halide perovskite materials. Herein, while in situ monitoring the optical evolution of the material in humid air, spectroscopic ellipsometry is used to investigate the dielectric function of FASnI3 layers (with and without additives) within the range of 1–5 eV. According to calculations based on the density functional theory that shows oxygen diffusion on FASnI3 surfaces, the steady decrease in absorption coefficient in the band gap region (1.47 eV) and simultaneous increase in absorption in the 3–4.5 eV region suggest the production of amorphous tin oxide. Concurrently, X‐ray diffraction reveals a clear degradation of FASnI3. With the addition of sodium borohydride and dipropylammonium iodide, the optically active area of about 1.47 eV is preserved for a longer period while SnO2 production is prevented. Last but not least, FASnI3's …
Publication date: 
1 Jan 2023

Giovanni Mannino, Jesús Sanchez-Diaz, Emanuele Smecca, Salvatore Valastro, Ioannis Deretzis, Rafael S Sánchez, Juan P Martinez-Pastor, Iván Mora-Seró, Alessandra Alberti

Biblio References: 
Pages: 2300610
Solar RRL