Parametric Variation of ZnSe/TiO2Electron Transport Layer Based Perovskite Solar Cell: A Simulation Study and Optimization

Electron transport layer (ETL) of perovskite solar cell (PSC) plays an important role in improving the power conversion efficiency (PCE) and photo-stability, other than being responsible for reducing hysteresis losses. That way, choice of appropriate materials become very important for ETL. Recent work shows zinc selenide (ZnSe) based ETL significantly reduces the hysteresis in PSC. In this work, the viability of ZnSe/titanium oxide (TiO
₂
) based ETL and the impact of their parametric variations on the performance of PSCs have been studied to further enhance the efficiency. To achieve this objective, a calibrated software program has been written for perovskite device based on ZnSe/TiO
₂
ETL and further optimization has been performed to enhance the PCE. The device is optimized for optimum thickness and doping density of ETL. The optimized PCE of 20.8% is achieved at ZnSe (150 nm)/TiO
₂
(30 nm) thick ETL with a doping density of 5×10
¹⁸
cm
^-3
.