Hyperactive Selenium Source Yields Kesterite Solar Cells with 12.86% Efficiency
Source abstract
Abstract
Abstract 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 Na2(Se2S) solution, which enables the direct introduction of hyperactive Se2, Se3, and Se4 into the precursors. The results demonstrate that Se2, Se3, and Se4 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 CuZn and SnZn defects, as well as [2CuZn + SnZn] 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.
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Research context
OpenAlex topics: Chalcogenide Semiconductor Thin Films · Quantum Dots Synthesis And Properties · Copper-based nanomaterials and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Key Laboratory of Micro‐Nano Materials for Energy Storage and Conversion of Henan Province Institute of Surface Micro and Nano Materials College of Chemical and Materials Engineering Xuchang University Xuchang 461000 China
Key Laboratory for Special Functional Materials (MoE) Henan University Kaifeng 475004 China
Miami College of Henan University Kaifeng 475004 China
Center for Excellence in Nanoscience (CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS) National Center for Nanoscience and Technology Beijing 100190 China
Funding
National Natural Science Foundation of China · Natural Science Foundation of Henan Province · Key Scientific Research Project of Colleges and Universities in Henan Province · National Key Research and Development Program of China
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