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Slow halide exchange in CsPbIBr_(2) films for high-efficiency,carbon-based,all-inorganic perovskite solar cells

Science China Materials 2021年第9期64卷 2107-2117页

作者： Zeyang Zhang Dandan Chen Weidong Zhu Junxiao Ma Wenming Chai Dazheng Chen Jincheng Zhang Chunfu Zhang Yue Hao State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology&Shaanxi Joint Key Laboratory of Graphene School of MicroelectronicsXidian UniversityXi’an710071China College of Science Xi’an Shiyou UniversityXi’an710065China

halide exchange offers a versatile way to modify the properties of halide perovskites,but it is particularly challenging to slow the reaction rate to restrain defect growth in the ***,we propose a slow halide exchange strategy to simultaneously fine-tune the optical and microstructural characteristics of CsPbIBr_(2) films by physically pairing CsPbIBr_(2) and CH_(3)NH_(3)PbI_(3) *** a proper heating treatment is applied,halide exchange of Br^(-)and I^(-)ions between the films is activated,and the reaction rate can be well-controlled by the heating recipe,in which a high temperature can accelerate the exchange reaction,while a low temperature slows or stops *** using an optimal halide exchange temperature(110℃)and time(2 h),the parent CsPbIBr_(2) film was transformed into high-quality CsPbI_(1+x)Br_(2-x) film,featuring an extended absorption onset from 590 to 625 nm,coarsened grains,improved crystallinity,reduced surface roughness,suppressed halide phase segregation,and identical stability to the pristine ***,the efficiency of a carbon-based,all-inorganic perovskite solar cell(PSC)was boosted to 10.94%,which was much higher than that of the pristine CsPbIBr_(2) film(8.21%).The CsPbI_(1+x)Br_(2-x) PSC also possessed excellent tolerance against heat and moisture stresses.

关键词： halide exchange slow reaction rate CsPbIBr_(2) defects all-inorganic perovskite solar cells

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Combination of solution-phase process and halide exchange for all-inorganic, highly stable CsPbBr_3 perovskite nanowire photodetector

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Science China Materials 2019年第1期62卷 65-73页

作者： lunpeng Zeng Hai Zhou Ronghuan Liu Hao Wang Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials Hubei Key Laboratory of Ferroelectric and Dielectric Materials and Devices Faculty of Physics and Electronic Science Hubei University

The synthesis of high quality all-inorganic perovskite nanowires needs the harsh conditions,complex process and precision instruments,which are not beneficial to their extensive ***,all-inorganic perovskite ce- sium lead bromine (CsPbBr3)nanowires (NWs)are demonstrated with the combination of solution-phase process and halide exchange technology.A metal-semiconductor-metal structure CsPbBr3 nanowire photodetector was prepared, which showed a detectivity as high as 1.7×10^11 cm Hz^1/2W^-1 (Jones)with rapid response time (The rise and decay time are 10ms and 22 ms,respectively).Moreover,our photodetectors have high stability under ultraviolet (UV)light,high temperature and humidity.

关键词： solution-phase process halide exchange perovskite nanowires photodetector

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