摘要： Recently, organic-inorganic perovskite-based solar cells have become promising devices due to their unique proprieties in photovoltaic field. In this scenario, several studies focusing on perovskite solar cells based on Pb-perovskite layer. However, the factor of toxicity and stability of these devices is the main challenge to the progress in commercial production. In this study, a numerical modeling of perovskite solar cells using an alternative candidate which is Germanium as a perovskite material. This later is investigated in order to over- come the toxicity and stability effects on perovskite solar cells, and they exhibit similar photovoltaic perfor- mances as Pb-perovskite solar cells. Therefore, the effect of different kinds of electron transporting layer (ETL) materials on Ge-perovskite solar cell design is studied and investigated to enhance the conversion efficiency of perovskite devices. The obtained simulation results illustrate that perovskite solar cells based on C60 as ETL exhibit 13.5% of power conversion efficiency compared to that with other ETL materials. Thus, inserting C60 in perovskite solar cell design possibly will be considered as novel designing for future Ge-perovskite solar cells. The numerical simulation was performed using 1D-Solar Cell Capacitance Simulator (1D- SCAPS).