首页|Impact of oxygen incorporation on interface optimization and defect suppression for efficiency enhancement in Cu2ZnSn(S,Se)4 solar cells
Impact of oxygen incorporation on interface optimization and defect suppression for efficiency enhancement in Cu2ZnSn(S,Se)4 solar cells
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Kesterite Cu2ZnSn(S,Se)4(CZTSSe)solar cells suffer from severe carrier recombination,limiting the pho-tovoltaic performance.Unfavorable energy band alignment at the p-n junction and defective front inter-face are two main causes.Herein,oxygen incorporation in CZTSSe via absorber air-annealing was developed as a strategy to optimize its surface photoelectric property and reduce the defects.With opti-mized oxygen incorporation conditions,the carrier separation and collection behavior at the front inter-face of the device is improved.In particular,it is found that oxygen incorporated absorber exhibits increased band bending,larger depletion region width,and suppressed absorber defects.These indicate the dynamic factors for carrier separation become stronger.Meanwhile,the increased potential differ-ence between grain boundaries and intra grains combined with the decreased concentration of interface deep level defect in the absorber provide a better path for carrier transport.As a consequence,the cham-pion efficiency of CZTSSe solar cells has been improved from 9.74％to 12.04％with significantly improved open-circuit voltage after optimized air-annealing condition.This work provides a new insight for inter-face engineering to improve the photoelectric conversion efficiency of CZTSSe devices.
KesteriteThin film solar cellInterface optimizationSurface oxidationDefect suppression
Key Laboratory for Special Functional Materials of MOE,National & Local Joint Engineering Research Centre for High-efficiency Display and Lighting Technology,School of Materials,Henan University,Kaifeng 475004,Henan,China
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,Henan,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaJoint Talent Cultivation Funds of NSFC-HNScience and Technology Innovation Talents in Universities of Henan Province
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