Double‐Absorber CZTS/Sb₂Se₃ Architecture for High‐Efficiency Solar‐Cell Devices

Abstract

The design and configuration of solar cells are critical for photovoltaic action and achieving high efficiency. Herein, the double‐absorber solar‐cell architecture of low‐bandgap Sb 2 Se 3 and high‐bandgap Cu 2 ZnSnS 4 (CZTS) absorbers for broader spectrum utilization leading to higher efficiency are comprehensively analyzed. The cost‐effective chalcogenides CZTS and Sb 2 Se 3 for high‐efficiency dual‐absorber configuration to show the possibility of high wattage at a lower cost are taken. The crucial parameters of bandgap pair and thickness are optimized for synergetic device performance and optimal utilization of the incident spectrum. By introducing an additional absorber–absorber interface, the interfacial defect at CZTS/Sb 2 Se 3 is lowered by optimizing the band offset for the efficient functioning of a double–absorber device. The proposed device has straightforward NiO/CZTS/Sb 2 Se 3 /AZO architecture suitable for low‐cost fabrication with high efficiency of 30.9%.