|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications X
||Impact of Cation Substitution in (AgxCu1-x)2ZnSnSe4 Absorber-based Solar Cells towards 10% Efficiency: Experimental and Theoretical Analyses
||Li-Chyong Chen, Shaham Quadir, Mohammad Qorbani, Ying-Ren Lai, Ho-Thi Thong, Amr Sabbah, Michitoshi Hayashi, Cheng-Ying Chen, Kuei-Hsien Chen
|On-Site Speaker (Planned)
Solar cells based on kesterite Cu2ZnSnSe4 (CZTSe) compounds with earth-abundant elements are highly desirable for the low-cost and high-efficiency production of renewable energy. However, the occurrence of intrinsic defects substantially impairs the photovoltaic properties of CZTSe. In this work, we applied a cation substitution method to control and passivate the defect states of kesterite CZTSe by incorporating Ag ions. Intensity-dependent low-temperature photoluminescence measurements show that Ag incorporation could reduce the density and depth of intrinsic defects in CZTSe. The results reveal that (AgxCu1-x)2ZnSnSe4, with x = 0.10, provides the shallowest defect states and less non-radiative recombination. Based on first-principles calculations, Ag incorporation enables the formation and suppresses the beneficial and detrimental defects, respectively, and the observed sub-band photoluminescence peaks can be assigned to the intrinsic point and cluster defects. The best power conversion efficiency of 10.2% is achieved for the 10%-Ag-alloyed CZTSe cell, along with an enhanced open-circuit voltage.
||Energy Conversion and Storage, Thin Films and Interfaces, Characterization