Performance evaluation of an all inorganic CsGeI<inf>3</inf> based perovskite solar cell by numerical simulation

The rapid advancement of organo-metal halide perovskite solar cells has led to a certified power conversion efficiency (PCE) of >25%. However, their ability to be implemented and commercialized on a large scale is currently limited due to the presence of toxic elements and the costly hole transport material (HTM) in the highly efficient cells. In the present work, a theoretical study on lead-free, environmental-friendly CsGeI3 based solar cell (SC) is demonstrated. Factors influencing the device parameters, such as thickness, doping, and defect concentration, have been thoroughly investigated to better understand material properties. With optimal material properties, the simulation results demonstrated 10.8% optimized PCE, Jsc of 22.08 mAcm−2, Voc of 0.667 V, and FF of 73.49%. These findings open up a new path for CsGeI3 as light-absorbing material to achieve clean, renewable energy.