文献类型：期刊文献

英文题名：A First-Principles Study of Copper-Deficient Layer and Its Effect in Chalcopyrite-Based Solar Cells: Carrier Dynamics Characteristics

作者：Chen, Qinmiao[1];Ni, Yi[1];Yuan, Hongcun[2]

机构：[1]East China Univ Sci & Technol, Sch Phys, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Changzhou Inst Technol, Sch Elect & Informat Engn, 229 South Tongjiang Rd, Changzhou 213002, Peoples R China

年份：2026

卷号：14

期号：5

外文期刊名：INORGANICS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001776383400001)】；

基金：This research was partially funded by National Natural Science Foundation of China (No. 11604097).

语种：英文

外文关键词：chalcopyrite-based solar cells; ordered vacancy compounds; CuIn5Se8; defect and carrier characteristics; carrier dynamics characteristics

摘要：CuIn5Se8 is reported as a remarkable copper-deficient layer that contains ordered vacancy compounds (OVCs) for high-efficiency chalcopyrite-based solar cells; however, the understanding of its carrier characteristics has remained limited. OVCs could naturally form on the surface of chalcopyrite absorber. In this study, the carrier dynamics characteristics of OVCs were investigated by constructing a junction consisting of chalcopyrite absorber and CdS buffer layer. At first, the band structure of CuIn5Se8 was studied to determine the bandgap properties. Then, thermodynamic stability, defect formation energy, defects and carrier concentration, defect transition energy level of CuIn5Se8 and its Cd doping state (caused by CdS) were comparatively studied. The results suggest that Cd doping has different effects on the defect and carrier characteristics of OVCs with various chemical potentials. However, the OVC always remains n-type under the whole thermodynamically stable region, with contribution from the hallow-level In-Cu donor defect. Finally, the OVC's carrier dynamics characteristics were assessed using the collected defect and carrier data. It is indicated that the OVC layer may contribute to the formation of a p-n homojunction in solar cells. Under selenium-rich conditions, the OVC layer increases the carrier density on the n-type side of p-n junction nearly 30-fold, which helps reduce the difference in carrier density and minority current density between two sides of the p-n junction. The conversion efficiency of the solar cell with OVC shows a 7.25% improvement when compared to the control. The distinct behavior of OVCs may serve as a valuable reference for the creation or improvement of a related functional film layer or device.