Hyperactive Selenium Source Yields Kesterite Solar Cells with 12.86% Efficiency

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 (Se 2 S) solution, which enables the direct introduction of hyperactive Se...

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Bibliographic Details
Published in:Advanced functional materials 2023-10, Vol.33 (44)
Main Authors: Wang, Mengyang, Geng, Hang, Zhu, Jichun, Cui, Yubo, Zhao, Shanheng, Fu, Junjie, Kou, Dongxing, Sun, Jie, Zhao, Chaoliang, Wu, Sixin, Ding, Liming, Zheng, Zhi
Format: Article
Language:English
Subjects:
Chemical activity
Clusters
Defects
Dimethylformamide
Energy conversion efficiency
Liquid phases
Materials science
Photovoltaic cells
Pressure
Selenium
Solar cells
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Summary: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 (Se 2 S) 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 Cu 2‐x Se 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.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202307389