High Efficiency CdTe Thin Film Solar Cells with CdSe as a Prospective Window Layer from Numerical Optimization
In this simulation, cadmium selenide (CdSe) has been utilized as a replacement for conventional cadmium sulfide (CdS) window layer by numerical simulation using Solar Cell Capacitance Simulator (SCAPS-1D). CdSe layer thickness, carrier concentration and band gap have been varied to investigate the optimum simulation parameters. An efficiency of 16.53% (Jsc of 24.89 mA/cm2, Voc of 0.87 V and fill factor (FF) of 76.22%) has been obtained with CdS window layer as the reference case. The proposed structure of SnO2/CdSe/CdTe/Al showed the highest conversion efficiency of 16.13% (Jsc of 24.32 mA/cm2, Voc of 0.87 V and FF of 76.19%). Furthermore, CdSe window layer exhibited almost similar results as the conventional CdS. All these simulation results specify that CdSe have the ideal prospects to be utilized as window layer for CdTe thin film solar cells.