Optimization of absorption layer and back reflection layer thicknesses for enhanced solar cell efficiency

Abstract

This study investigated the impact of absorption layer thickness and back reflection layer incorporation on (CIGS/TiO2/ZTO/ZnO:Al) solar cell efficiency. Results demonstrated that cell efficiency increases with absorption layer thickness until stabilizing at an optimal balance with other layers. The addition of a back reflection layer enhanced the efficiency while allowing for reduced absorption layer thickness, potentially lowering production costs. MoSe₂ was identified as the optimal back reflection layer material, enabling a reduction in absorption layer thickness to 0.5 µm. Initial results yielded Voc = 0.6865 V, Jsc=40.32 mA/cm², FF = 83.30 %, and η = 23.06 %. Further investigation revealed that back reflection layer thickness also influences cell performance, with efficiency increasing until stabilization. Optimizing this parameter resulted in improved final outcomes: Voc=0.6955 V, Jsc=42.98 mA/cm², FF = 83.10 % and η = 24.84 %. These findings contribute to the ongoing efforts to enhance solar cell efficiency and reduce manufacturing costs.