Enhanced CZTSSe Thin-Film Solar Cell Efficiency: Key Parameter Analysis

This work presents a numerical simulation study on CZTSSe-based thin-film solar cells using Silvaco Atlas software, focusing on optimization and loss analysis. Starting from an initial power conversion efficiency of 12.73%, the ZnO/CdS/CZTSSe cell structure is systematically optimized. Through precise adjustment of layer thickness and doping density, the efficiency is improved to 18.75%. The optimal parameters are 2.5 mu m (1017 cm-3) for CZTSSe, 0.01 mu m (1018 cm-3) for CdS, and 0.02 mu m (1019 cm-3) for ZnO. Loss analysis reveals that increasing CZTSSe thickness beyond 2.5 mu m leads to higher bulk series resistance, while thicker CdS and ZnO layers reduce photocurrent generation. Doping density significantly impacts open-circuit voltage, while layer thickness primarily affects short-circuit current and fill factor. Performance improves at lower temperatures, achieving 22.2% efficiency at 250 K. These findings provide valuable insights for developing high-efficiency CZTSSe solar cells. Numerical simulations on CZTSSe thin-film solar cells using Silvaco Atlas software reveal a power conversion efficiency increase from 12.73 to 18.75% through precise optimization of layer thickness and doping density for all layers of the cell. The analysis identifies optimal parameters and highlights the impact of these adjustments on performance, uncovering insights crucial for advancing high-efficiency CZTSSe solar cells.image (c) 2024 WILEY-VCH GmbH