Suppressing Element Inhomogeneity Enables 14.9% Efficiency CZTSSe Solar Cells
Qinghai New Energy (China) · Qingdao Institute of Bioenergy and Bioprocess Technology · +1 more institution
Abstract
Abstract Kesterites, Cu 2 ZnSn(S x Se 1− x ) 4 (CZTSSe), solar cells suffer from severe open‐circuit voltage ( V OC ) loss due to the numerous secondary phases and defects. The prevailing notion attributes this issue to Sn‐loss during the selenization. However, this work unveils that, instead of Sn‐loss, elemental inhomogeneity caused by Cu‐directional diffusion toward Mo(S,Se) 2 layer is the critical factor in the formation of secondary phases and defects. This diffusion decreases the Cu/(Zn+Sn) ratio to 53% at the bottom fine‐grain layer, increasing the Sn‐/Zn‐related bulk defects. By suppressing the Cu‐directional diffusion with a blocking layer, the crystal quality is effectively improved and the defect…
Citation impact
- FWCI
- 21.79
- Percentile
- 100%
- References
- 61
Authors
9- YLYimeng Li
Qinghai New Energy (China), Qingdao Institute of Bioenergy and Bioprocess Technology, University of Chinese Academy of Sciences
- CCChangcheng Cui
Qinghai New Energy (China), Qingdao Institute of Bioenergy and Bioprocess Technology, University of Chinese Academy of Sciences
- HWHao Wei
Qinghai New Energy (China), Qingdao Institute of Bioenergy and Bioprocess Technology, University of Chinese Academy of Sciences
- ZSZhipeng ShaoCorresponding
Qinghai New Energy (China), Qingdao Institute of Bioenergy and Bioprocess Technology
- ZWZucheng Wu
Qinghai New Energy (China), Qingdao Institute of Bioenergy and Bioprocess Technology
Topics & keywords
- Materials science
- Diffusion
- Layer (electronics)
- Solar cell
- Photovoltaic system
- Kesterite
- Energy conversion efficiency
- Work (physics)
- Affordable and clean energy