Document Type : Research
Authors
1 Department of Semiconductor, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran.
2 Department of Physics, Yazd University, Yazd, Iran.
3 Department of Fiber Optic, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran
Abstract
In this study, optical properties of the CH3NH3PbI3 perovskite layer, which was deposited using lead iodide (PbI2) and methyl ammonium iodide (MAI) in DMF and DMSO solvents in a single-step method with chlorobenzene as an anti-solvent, were investigated and analyzed. For this purpose, by applying chlorobenzene as an antisolvent at 7, 10, and 13 seconds after the start of deposition process, the optical parameters of the perovskite layer, including absorption coefficient, direct and indirect optical bandgaps, extinction coeficient, refractive index, optical conductivity, and urbach energy, were calculated. For perovskite layer that antisolvent was applied 10 seconds after the start of the deposition, direct and indirect optical gaps were 1.61 and 1.55 eV, respectively, and for the 7-second sample, they were 1.57 and 1.51 eV, respectively, and for the 13-second sample, they were 1.54 and 1.48 eV, respectively. The urbach energy for the perovskite layer with the antisolvent treatment time of 10 seconds after the start of the deposition process was 0.05 eV, which was lower than the value of this parameter for the 7 and 13 second samples, which were 0.095 and 0.119 eV, respectively, indicating the formation of perovskite crystals with better quality and fewer lattice defects. The results of this research can be used in the design and optical optimization of solar cells with perovskite absorbing layers.
Keywords
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