Abstract
The optimized halide stoichiometry in mixed-halide perovskites offers the enhanced photophysical properties of perovskites films for efficient and stable perovskites solar cells (PSCs). Herein, a comprehensive analysis of the impact of the variation of cationic bromide (CH3NH3Br or MABr) concentration on the performance parameters of mixed halide (MAPbI3-xBrx) PSCs have been presented. It was noted that with an increase of MABr concentration from 10 to 70 mg/ml, open-circuit voltage (Voc) increases from 942 mV to 992 mV, short circuit current density (Jsc) decreases from 19.83 mA/cm2 to 12.36 mA/cm2. Device having 20 mg/ml MABr exhibits best performance with an efficiency η = 12.18%, Voc = 0.96 V, Jsc = 18.99 mA/cm2 and fill factor (FF) = 0.67. Furthermore, photovoltaic (PV) cell parameters, i.e., Jph, Rsh, Rs, n, and J0 were analytically extracted and analyzed to recognize the influence of MABr. The best performing devices exhibits a higher photocurrent density: Jph = 19.16 mA/cm2, optimum device resistances: Rsh=869.57 Ω-cm2, Rs = 7.91 Ω-cm2, minimum value of ideality factor n = 1.52 and negligible leakage current density: J0 = 3.95 × 10−13 mA/cm2. The predicted PV cell parameters suggest that the best performing device possesses optimum morphology, lowest leakage current, and reduced recombination of charge carriers.
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