Abstract
In this paper, a thin film tandem solar cell based on CGS/CIGS structure incorporating ZnS buffer layers has been designed and its performance characteristics were obtained using Silvaco-Atlas 2D numerical simulator. A tandem cell with CdS buffer layers was also modeled and simulated with the same method for reference. Our results show that the tandem solar cell with ZnS buffer layers has a maximum conversion efficiency of 28.34% compared to a maximum conversion efficiency of 26.85% obtained for CdS-based tandem solar cell used as a reference. The maximum conversion efficiency for theoretically studied CdS-based tandem solar cell found in literature is 26.21%. Thus, ZnS can be used as a potential replacement for CdS that is notoriously known as a highly toxic compound. Optimum values of doping concentration and thickness are obtained for all layers of the solar cell. In addition, the effect of temperature on ZnS-based CGS/CIGS tandem cell was studied.
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