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Effective Surface Treatment for High‑Performance Inverted CsPbI2Br Perovskite Solar Cells with Efficiency of 15.92%

Nano-Micro Letters 2020年第12期12卷 133-145页

作者： Sheng Fu Xiaodong Li Li Wan Wenxiao Zhang Weijie Song Junfeng Fang Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201People’s Republic of China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049People’s Republic of China School of Physics and Electronics Science Engineering Research Center of Nanophotonics&Advanced InstrumentMinistry of EducationEast China Normal UniversityShanghai 200241People’s Republic of China

Developing high-efficiency and stable inverted CsPbI2Br perovskite solar cells is vitally urgent for their unique advantages of removing adverse dopants and compatible process with tandem cells in comparison with the ***,relatively low opening circuit voltage(voc)and limited moisture stability have lagged their progress far from the ***,we propose an effective surface treatment strategy with high-temperature FABr treatment to address these *** induced ions exchange can not only adjust energy level,but also gift effective ***,the gradient distribution of FA+can accelerate the carriers transport to further suppress bulk ***,the Br-rich surface and FA+substitution can isolate moisture *** a result,the optimized devices show champion efficiency of 15.92%with voc of 1.223 *** addition,the tolerance of humidity and operation get significant promotion:maintaining 91.7%efficiency after aged at RH 20%ambient condition for 1300 h and 81.8%via maximum power point tracking at 45°C for 500 h in ***,the unpackaged devices realize the rare reported air operational stability and,respectively,remain almost efficiency(98.9%)after operated under RH 35%for 600 min and 91.2%under RH 50%for 300 min.

关键词： CsPbI2Br Inverted perovskite solar cells Effective passivation voc loss Stability

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基于表面原位重构策略的高效全无机钙钛矿太阳能电池（英文）

基于表面原位重构策略的高效全无机钙钛矿太阳能电池（英文）

引用

第四届全国太阳能电池材料与器件大会

作者：楚新波卞绍奇叶秋枫游经碧鲁东大学

All-inorganic perovskites are emerging as excellent photovoltaic candidate for single junction or tandem solar cells. However, large energy loss due to nonradiative recombination is the main constraints for performance enhancement. Accordingly, we developed a surface in-situ reconstruction（SISR） strategy for inorganic perovskite by Cs F treatment, which can suppress nonradiative recombination and promote hole extraction simultaneously. Surface defects can be effectively passivated by the introduced fluorine and carrier lifetime was prolonged from 11.5 ns to 737.2 ns. In addition, a wider bandgap perovskite layer can be generated as graded heterojunction to facilitate hole extraction. The SISR reaction mechanism was also verified from both kinetic calculations and experiments. As a result, CsPbIBr solar cell with SISR achieved an efficiency of 21.02% with a high open circuit voltage of 1.27 V and fill factor of 85.3%. This work provides an effective approach to modulate inorganic perovskite surface for design efficient solar cells.

关键词： All-inorganic PSCs surface in-situ reconstruction nonradiative recombination graded heterojunction voc loss

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