Journal
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
Volume 150, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mssp.2022.106973
Keywords
DFT; Halide perovskites; Indium based compounds; Structural properties; Electronic band structure; Density of states; Optical properties
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This study investigates the structural, electronic, and optical properties of inorganic indium-based halide perovskites with new composition InACl(3) (A = Ge, Sn, and Pb) using density functional theory (DFT). The results show that InGeCl3 has a direct bandgap nature, while InSnCl3 and InPbCl3 have indirect bandgap. InGeCl3 is considered an attractive Pb-free material for photovoltaic applications.
The structural, electronic, and optical properties of inorganic indium-based halide perovskites with new composition InACl(3) (A = Ge, Sn, and Pb) are investigated in this work using density functional theory (DFT). These compounds are cubic in nature and their optimized lattice constants were found to be in the range 5.53-5.56 angstrom. The calculated band structure reveals that InGeCl3 has direct bandgap nature while InSnCl3 and InPbCl3 are having indirect bandgap. The energy band gap values are found to be 1.89 eV, 0.87 eV and 1.84 eV for InGeCl3, InSnCl3 and InPbCl3, respectively. This makes InGeCl3 an attractive option as a Pb-free material for photovoltaic applications. The semiconducting energy gaps of InSnCl3 and InPbCl3 show their suitability for solar cells. The elastic constants C-ij are calculated and analyzed for studying the mechanical response of studied compounds to external forces. For the photons of 0-20 eV energy range, optical parameters such as the real and imaginary parts of the dielectric function, refractive index, reflectivity, and absorption coefficient are computed and discussed. The simulation results for the studied compounds are reported for the first time in the literature.
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