Design and optimization of CdSe-CuSbSe2-based double-junction two-terminal tandem solar cells with VOC> 2.0 V and PCE over 42%

TL;DR

This paper presents the design and simulation of a CdSe-CuSbSe2 double-junction tandem solar cell achieving over 42% efficiency and VOC exceeding 2.0 V through optimization of layer properties.

Contribution

It introduces a detailed simulation and optimization approach for high-efficiency all-chalcogenide tandem solar cells using SCAPS-1D.

Findings

Efficiency of 42.64% achieved in simulation

Open circuit voltage of 2.09 V demonstrated

Optimized layer parameters significantly improve performance

Abstract

In this article, we demonstrate CdSe-CuSbSe2-based double junction two-terminal tandem solar cells simulated with SCAPS-1D. The highest performance of the tandem cell has been confirmed by optimizing the electrical and optical properties of window, top absorber, CdSe (bandgap 1.7 eV), bottom absorber, CuSbSe2 (bandgap 1.08 eV) and back surface layers. In addition, the effect of different parameters such as thickness, doping, defect density of different layers has been investigated in details. With the optimized condition, the modeled CdSe-CuSbSe2 double-junction two-terminal tandem solar cell displays the noticeable efficiency of 42.64% with open circuit voltage of 2.09 V, short circuit current density of 24.09 mA/cm2 and fill factor of 84.36%, respectively. These results are highly propitious for the construction of all-chalcogenide based high performance tandem photovoltaic cells in the future.