EFFECT OF INDIUM VACANCY POINT DEFECT ON THE STRUCTURAL, ELECTRONIC AND OPTICAL PROPERTIES OF DOUBLE PEROVSKITE HALIDE Cs2InSbCl6
EFFECT OF INDIUM VACANCY POINT DEFECT ON THE PROPERTIES OF DOUBLE PEROVSKITE HALIDE
Keywords:vacancy, defect, solar cell
Efforts to replace the lead-based perovskite have gain significant improvements in the last decade. Lead free double halide perovskite are being considered to replace the toxic lead-based perovskite materials for solar cell applications. Density functional theory (DFT) and linear response time-dependent density functional theory (TDDFT) are used in this study to simulate and investigate the effect of vacancy in the Indium (In) site of lead-free double halide perovskite A2BB′X6 (A = Cs; B = In, B′ = Sb; X = Cl) on the structural, electronic, and optical properties for possible solar cell application. On the structural properties, the total bond length of the material Cs2InSbCl6 was found to be 30.3848 Å and the creation of the indium vacancy raises the value to 30.594 Å. The bulk modulus of Cs2InSbCl6 was calculated to be 28.44 Gpa and 26.22 Gpa for Cs2In-xSbCl6. The calculated band structure for Cs2InSbCl6reveals semiconducting behavior with a direct energy band gap of 0.99 eV along
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