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Improving the Performance of PbS Quantum Dot Solar Cells by Optimizing ZnO Window Layer

Improving the Performance of PbS Quantum Dot Solar Cells by Optimizing ZnO Window Layer
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摘要 Comparing with hot researches in absorber layer,window layer has attracted less attention in PbS quantum dot solar cells(QD SCs). Actually, the window layer plays a key role in exciton separation, charge drifting, and so on.Herein, ZnO window layer was systematically investigated for its roles in QD SCs performance. The physical mechanism of improved performance was also explored. It was found that the optimized ZnO films with appropriate thickness and doping concentration can balance the optical and electrical properties, and its energy band align well with the absorber layer for efficient charge extraction. Further characterizations demonstrated that the window layer optimization can help to reduce the surface defects, improve the heterojunction quality, as well as extend the depletion width. Compared with the control devices, the optimized devices have obtained an efficiency of 6.7% with an enhanced V_(oc) of 18%, J_(sc) of 21%, FF of 10%, and power conversion efficiency of 58%. The present work suggests a useful strategy to improve the device performance by optimizing the window layer besides the absorber layer. Comparing with hot researches in absorber layer,window layer has attracted less attention in PbS quantum dot solar cells(QD SCs). Actually, the window layer plays a key role in exciton separation, charge drifting, and so on.Herein, ZnO window layer was systematically investigated for its roles in QD SCs performance. The physical mechanism of improved performance was also explored. It was found that the optimized ZnO films with appropriate thickness and doping concentration can balance the optical and electrical properties, and its energy band align well with the absorber layer for efficient charge extraction. Further characterizations demonstrated that the window layer optimization can help to reduce the surface defects, improve the heterojunction quality, as well as extend the depletion width. Compared with the control devices, the optimized devices have obtained an efficiency of 6.7% with an enhanced V_(oc) of 18%, J_(sc) of 21%, FF of 10%, and power conversion efficiency of 58%. The present work suggests a useful strategy to improve the device performance by optimizing the window layer besides the absorber layer.
出处 《Nano-Micro Letters》 SCIE EI CAS 2017年第2期156-165,共10页 纳微快报(英文版)
基金 financially supported by the National Natural Science Foundation of China(61306137,51602114) the Research Fund for the Doctoral Program of Higher Education(20130142120075) the Fundamental Research Funds for the Central Universities(HUST:2016YXMS032) the Guangdong-Hong Kong joint innovation project(Grant No.2016A050503012) the Guangdong Natural Science Funds for Distinguished Young Scholars(Grant No.2015A030306044)
关键词 ZNO Window layer Thin film solar cells PbS quantum dots Physical mechanism ZnO Window layer Thin film solar cells PbS quantum dots Physical mechanism
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