Indium Doping of Lead-Free Perovskite Cs2SnI6

Shodruz T Umedov; Anastasia V Grigorieva; Leonid S Lepnev; Alexander V Knotko; Koji Nakabayashi; Shin-Ichi Ohkoshi; Andrei V Shevelkov

doi:10.3389/fchem.2020.00564

Indium Doping of Lead-Free Perovskite Cs₂SnI₆

Front Chem. 2020 Aug 4:8:564. doi: 10.3389/fchem.2020.00564. eCollection 2020.

Authors

Shodruz T Umedov¹, Anastasia V Grigorieva^{1

2}, Leonid S Lepnev³, Alexander V Knotko^{1

2}, Koji Nakabayashi⁴, Shin-Ichi Ohkoshi⁴, Andrei V Shevelkov²

Affiliations

¹ Department of Materials Science, Lomonosov Moscow State University, Moscow, Russia.
² Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia.
³ Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russia.
⁴ Department of Chemistry, School of Sciences, University of Tokyo, Tokyo, Japan.

Abstract

Structure and properties of an inorganic perovskite Cs₂SnI₆ demonstrated its potential as a light-harvester or electron-hole transport material; however, its optoelectronic properties are poorer than those of lead-based perovskites. Here, we report the way of light tuning of absorption and transport properties of cesium iodostannate(IV) Cs₂SnI₆ via partial heterovalent substitution of tin for indium. Light absorption and optical bandgaps of materials have been investigated by UV-vis absorption and photoluminescent spectroscopies. Low-temperature electron paramagnetic resonance spectroscopy was used to study the kind of paramagnetic centers in materials.

Keywords: Raman spectroscopy; cesium iodostannate(IV); optical characteristics; perovskite photovoltaics; solid solution.