Photoluminescence in Organometal Halide Perovskites: Free Carrier Versus Exciton

被引:2
作者
Yang, Xiao [1 ,2 ]
Yan, Xiaoliang [1 ]
Wang, Yuchen [1 ]
Chen, Wei [1 ]
Wang, Ruizhi [1 ]
Wang, Weiwei [3 ]
Li, Heng [1 ]
Ma, Wanli [3 ]
Sheng, ChuanXiang [1 ]
机构
[1] Nanjing Univ Sci & Technol, Sch Elect & Opt Engn, Nanjing 210094, Jiangsu, Peoples R China
[2] Huaiyin Inst Technol, Fac Elect Informat Engn, Huaian 223003, Peoples R China
[3] Soochow Univ, Inst Funct Nano & Soft Mat, Suzhou 215123, Peoples R China
来源
IEEE JOURNAL OF PHOTOVOLTAICS | 2017年 / 7卷 / 02期
基金
国家高技术研究发展计划(863计划); 美国国家科学基金会;
关键词
Organometal halide perovskite; photoexcitation; photoluminescence (PL); solar energy; SOLAR-CELLS; CHARGE-CARRIERS; CH3NH3PBI3; PERFORMANCE; EFFICIENCY; LENGTHS;
D O I
10.1109/JPHOTOV.2016.2633804
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The photoexcitation dynamics in CH3NH3 PbI3 thin films has been studied by nanosecond time-resolved photoluminescence (PL) and transient photoinduced absorption. Under excitation intensity from similar to 0.1 to similar to 100 mu J/cm(2), free carrier is the dominant photoexcitation species. However, in the intermediate excitation intensity from similar to 1 to similar to 10 mu J/cm(2), a small fraction of photoexcitations are excitons, which, however, are responsible for PL within this excitation intensity range. The branching ratio between excitons and free carriers at 2 mu J/cm(2) was estimated to be 17%. Furthermore, the spectral narrowing PL was found at the low temperature after the formation of excitons, indicating that laser action could be due to excitonic emission. Our findings provide fundamental insights into the optical properties of organometal halide perovskites with direct implications for optoelectronics.
引用
收藏
页码:513 / 517
页数:5
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