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 Sb2Se3 and high-bandgap Cu2ZnSnS4 (CZTS) absorbers for broader spectrum utilization leading to higher efficiency are comprehensively analyzed. The cost-effective chalcogenides CZTS and Sb2Se3 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/Sb2Se3 is lowered by optimizing the band offset for the efficient functioning of a double–absorber device. The proposed device has straightforward NiO/CZTS/Sb2Se3/AZO architecture suitable for low-cost fabrication with high efficiency of 30.9%.