Effect of CH3NH3I Concentration on Efficieny of Mesoporous Methylammonium Lead Iodide Perovskite Solar Cell

Perovskite solar cells (PSCs) based on organometal halide have emerged as excellent light absorbers in solar cells with a rapid evolution in efficiency from 3.8% in 2009 to 22.1% in 2016 [1,2]. The remarkable achievement in power conversion efficiency (PCE) of perovskite solar cells is attributed to the unique properties of these materials, such as appropriate direct band gap, high absorption coefficient, long charge diffusion lengths, excellent carrier mobility and solution-based fabrication method [3-4].In this work, we investigated the effects of CH3NH3I concentration in mesoporous perovskite solar cells prepared using a two-step solution deposition method. Photovoltaic performance of PSCs is found to strongly depends on the concentration of CH3NH3I. Under simulated one-sun illumination, average efficiencies of 6.1% (s.d.±0.31), 9.96% (s.d.±0.67) and 2.4% (s.d.±0. 4) are obtained from solutions of CH3NH3I with concentrations of 0.038 M, 0.044 M and 0.063 M, respectively. we achieved the best efficiency of 11.29% with a photocurrent density of 20.22 mA.cm–2, open-circuit photovoltage of 0.814 V and fill factor of 0.66.