Exciton localization in solution-processed organolead trihalide perovskites

Haiping He (), Qianqian Yu, Hui Li, Jing Li, Junjie Si, Yizheng Jin (), Nana Wang, Jianpu Wang, Jingwen He, Xinke Wang, Yan Zhang and Zhizhen Ye ()
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Haiping He: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University
Qianqian Yu: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University
Hui Li: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University
Jing Li: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University
Junjie Si: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University
Yizheng Jin: Center for Chemistry of High-Performance and Novel Materials and State Key Laboratory of Silicon Materials, Zhejiang University
Nana Wang: Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road
Jianpu Wang: Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road
Jingwen He: Capital Normal University, Beijing Key Lab for Metamaterials and Devices, and Key Laboratory of Terahertz Optoelectronics, Ministry of Education
Xinke Wang: Capital Normal University, Beijing Key Lab for Metamaterials and Devices, and Key Laboratory of Terahertz Optoelectronics, Ministry of Education
Yan Zhang: Capital Normal University, Beijing Key Lab for Metamaterials and Devices, and Key Laboratory of Terahertz Optoelectronics, Ministry of Education
Zhizhen Ye: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract Organolead trihalide perovskites have attracted great attention due to the stunning advances in both photovoltaic and light-emitting devices. However, the photophysical properties, especially the recombination dynamics of photogenerated carriers, of this class of materials are controversial. Here we report that under an excitation level close to the working regime of solar cells, the recombination of photogenerated carriers in solution-processed methylammonium–lead–halide films is dominated by excitons weakly localized in band tail states. This scenario is evidenced by experiments of spectral-dependent luminescence decay, excitation density-dependent luminescence and frequency-dependent terahertz photoconductivity. The exciton localization effect is found to be general for several solution-processed hybrid perovskite films prepared by different methods. Our results provide insights into the charge transport and recombination mechanism in perovskite films and help to unravel their potential for high-performance optoelectronic devices.

Date: 2016
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DOI: 10.1038/ncomms10896

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