Hyperactive Selenium Source Yields Kesterite Solar Cells with 12.86% Efficiency
ADVANCED FUNCTIONAL MATERIALS(2023)
摘要
One of the main issues that limits the efficiency of kesterite solar cells is the low diffusion and chemical activity of selenium clusters. Here, this work proposes a simple and effective pre-selenization strategy using Na-2(Se2S) solution, which enables the direct introduction of hyperactive Se-2, Se-3, and Se-4 into the precursors. The results demonstrate that Se-2, Se-3, and Se-4 promote the formation of the Cu2-xSe liquid phase and enhance the diffusion of elements from different micro-regions. Consequently, the ratios of Cu/(Zn + Sn) and Sn/Zn in different micro-regions of the absorber are controlled within the optimal range, exhibiting reduced fluctuations. The controlled environment suppresses the formation of Cu-Zn and Sn-Zn defects, as well as [2Cu(Zn) + Sn-Zn] defect clusters. Finally, a power conversion efficiency (PCE) of 12.86% is achieved, which is the highest PCE for kesterite solar cells made under ambient pressure and with N,N-dimethylformamide solvent.
更多查看译文
关键词
chemical environment,hyperactive selenium source,intrinsic defects,kesterite solar cells,open circuit voltage deficit
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要