globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1704421114
论文题名:
Origin of long lifetime of band-edge charge carriers in organic–inorganic lead iodide perovskites
作者: Chen T.; Chen W.-L.; Foley B.J.; Lee J.; Ruff J.P.C.; Ko J.Y.P.; Brown C.M.; Harriger L.W.; Zhang D.; Park C.; Yoon M.; Chang Y.-M.; Choi J.J.; Lee S.-H.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2017
卷: 114, 期:29
起始页码: 7519
结束页码: 7524
语种: 英语
英文关键词: Carrier lifetime ; Organic–inorganic hybrid perovskite ; Photoluminescence ; Polaron
Scopus关键词: iodide ; lead ; methylammonium ; organolead compound ; perovskite ; calcium derivative ; heavy metal ; iodide ; oxide ; perovskite ; titanium ; Article ; electricity ; electron ; entropy ; molecule ; photoluminescence ; priority journal ; screening ; chemistry ; luminescence ; neutron ; photochemistry ; solar energy ; sunlight ; temperature ; Calcium Compounds ; Electrons ; Iodides ; Luminescence ; Metals, Heavy ; Neutrons ; Oxides ; Photochemistry ; Solar Energy ; Sunlight ; Temperature ; Titanium
英文摘要: Long carrier lifetime is what makes hybrid organic–inorganic perovskites high-performance photovoltaic materials. Several microscopic mechanisms behind the unusually long carrier lifetime have been proposed, such as formation of large polarons, Rashba effect, ferroelectric domains, and photon recycling. Here, we show that the screening of band-edge charge carriers by rotation of organic cation molecules can be a major contribution to the prolonged carrier lifetime. Our results reveal that the band-edge carrier lifetime increases when the system enters from a phase with lower rotational entropy to another phase with higher entropy. These results imply that the recombination of the photoexcited electrons and holes is suppressed by the screening, leading to the formation of polarons and thereby extending the lifetime. Thus, searching for organic–inorganic perovskites with high rotational entropy over a wide range of temperature may be a key to achieve superior solar cell performance. © 2017, National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163816
Appears in Collections:气候变化与战略

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作者单位: Chen, T., Department of Physics, University of Virginia, Charlottesville, VA 22904, United States; Chen, W.-L., Center for Condensed Matter Sciences, National Taiwan University, Taipei, 10617, Taiwan; Foley, B.J., Department of Chemical Engineering, University of Virginia, Charlottesville, VA 22904, United States; Lee, J., Cornell High Energy Synchrotron Source, Cornell University, Ithaca, NY 14853, United States; Ruff, J.P.C., Cornell High Energy Synchrotron Source, Cornell University, Ithaca, NY 14853, United States; Ko, J.Y.P., Cornell High Energy Synchrotron Source, Cornell University, Ithaca, NY 14853, United States; Brown, C.M., NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, United States; Harriger, L.W., NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, United States; Zhang, D., Department of Physics, University of Virginia, Charlottesville, VA 22904, United States; Park, C., Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States; Yoon, M., Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States; Chang, Y.-M., Center for Condensed Matter Sciences, National Taiwan University, Taipei, 10617, Taiwan; Choi, J.J., Department of Chemical Engineering, University of Virginia, Charlottesville, VA 22904, United States; Lee, S.-H., Department of Physics, University of Virginia, Charlottesville, VA 22904, United States

Recommended Citation:
Chen T.,Chen W.-L.,Foley B.J.,et al. Origin of long lifetime of band-edge charge carriers in organic–inorganic lead iodide perovskites[J]. Proceedings of the National Academy of Sciences of the United States of America,2017-01-01,114(29)
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