Numerical Optimization of ZnMgO/CIGS Based Heterojunction Solar Cells via Change of Buffer and BSF Layer

Abstract

In this work, the scientific community has presented acceptable physical properties of ZnMgO semiconductor which is among the buffer materials that later used for better consideration solar cell fabrication. In our effort, AFROS-HET version 2.5 one dimensional simulator is applied to the optimization of ZnMgO buffer and ZnSe BSFC (Back Surface Field Contact) layer-based solar cells. The buffer and BSFC layer are introduced in the conventional experimental device Grid AR/ITO/ZnO/CdS/CIGS/Mo/Na glass solar structure to improve the performance of the electrical parameters of the device and which is used in the field of renewable energy. We have introduced ZnMgO material in the portion of the buffer layer for improvement of efficiency from 13.8 to 37.39%. Several physical parameters optimization (i.e. doping density, thickness and EQE) of the buffer, absorber and BSFC layer has been done. The performance of the electrical parameters of the proposed structure is achieved (Voc = 898.1 mV, Jsc = 52.94 mA/cm2, FF = 78.64 and η = 37.39%) keeping the fixed value of doping density and thickness of ZnMgO about Nd = 4 × 1019 cm−3 and W = 50 nm. These results are optimized of AM1.5G irradiance (1sun = 100 mW/cm2) and the temperature was kept constant at 300 K.