Since the perovskite layer plays an important role in improving performance of perovskite solar cells, adjusting optical properties of the perovskite material is accessible by controlling the constituents of the perovskite layer. Therefore, in this study, photovoltaic parameters of solar cells made based on CH3NH3PbI3 and CH3NH3PbI3-xClx perovskites are investigated. The best power conversion efficiency obtained for CH3NH3PbI3 and CH3NH3PbI3-xClx were 7.61% and 9.61% respectively. Also, the higher efficiency of CH3NH3PbI3-xClx was due to better fill factor of the cell made by this material
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