Sb2S3 and GaAs Absorber Layer-based Quantum Dot Solar Cells with Cadmium Telluride-based HTL: A Comparative Study

Abstract

Quantum dot solar cells (QDSC) are widely acknowledged to be one of the best solar energy harvesting devices in the present world. Absorber layer is a core component of a QDSC with a strong influence on its operational efficiency. Hence, we choose to undertake a comparative study of two QDSC having different QD absorber layers: Sb2S3 and GaAs with the motive to identify the better absorber layer material. The numerical analysis has been carried out using SCAPS-1D (Solar Cell Capacitance Simulator-1D). The structure of the QDSCs under study are: FTO/TiO2/CdS/Sb2S3/CuI/C and FTO/TiO2/CdS/GaAs/CuI/C. Critical parameters, including temperature, back contact work function, series and shunt resistances, were meticulously adjusted in the simulations, demonstrating that the maximum efficiency attained by Sb2S3 and GaAs absorber layer based QDSC is 15.94% and 26.95% respectively indicating GaAs-QD to be a better absorber layer material for a QDSC.