Formation and Properties of the Antimony-Based Halide Perovskites Films

Abstract

Three types of cesium stibium double perovskite Cs₂AgSbICl₅,Cs₂AgSbI₃Cl₃ and Cs₂SbInCl₆ were synthesized. Heterojunctions of cesium stibium double perovskite/TiO₂ were fabricated by spin coating method; the structural and optical properties were investigated. Structural characteristics by using X-ray diffraction have been investigated, and optical properties by using UV?vis system were measured.

The perovskite Cs₂AgSbICl₅, Cs₂AgSbI₃Cl₃ and Cs₂SbInCl₆ have a cubic structure with ( ) space grouping symmetry. The UV-visible spectra for the synthesized Cs₂AgSbI_xCl_6-x with (x=1, 3) and Cs₂SbInCl₆ perovskites have a high absorption coefficient value (? >105/cm), and two distinguished absorption peaks (1, and 2)appeared in the range (200–320) nm close to the UV region. The Cs₂AgSbICl₅, Cs₂AgSbI₃Cl₃ and Cs₂SbInCl₆perovskites have indirect bandgap nature and their optical bandgaps are about (3.5, 3.6, and 3.7) eVrespectively.

TheI-V curves of the Cs₂AgSbI_xCl_6?x, with (x=1, 3) and Cs2SbInCl6 perovskites hetero-structures with configurations (FTO/ TiO2/ Cs2AgSbIxCl6?x /Cu₂O/Al) and (FTO/ TiO₂/ Cs₂SbInCl₆/Cu₂O/ Al) were synthesized. The results exhibit that low power conversion efficiency PCEs. Unfortunately, it looks that Sb-based perovskite materials are not appropriate for solar cell absorbers. However, their working efficiency is not sufficient due to their large bandgap.