Influence of molybdenum and technetium doping on visible light absorption, optical and electronic properties of lead-free perovskite CsSnBr for optoelectronic applications.

Lead-free metal halide perovskites have nowadays become familiar owing to their potential use in solar cells and other optoelectronic applications. In this study, we carried out the structural, elastic, electronic, and optical properties of pure and metal (Mo/Tc) doped CsSnBr by using the density functional theory. The metal doping CsSnBr displays a narrowing band gap and as a result the optical functions exhibit high absorption and high conductivity in the visible region.