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DOI	10.1073/pnas.1704421114
	Origin of long lifetime of band-edge charge carriers in organic–inorganic lead iodide perovskites
	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.
发表日期	2017
ISSN	0027-8424
起始页码	7519
结束页码	7524
卷号	114 期号:29
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.
英文关键词	Carrier lifetime; Organic–inorganic hybrid perovskite; Photoluminescence; Polaron
语种	英语
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
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160612
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., C...
推荐引用方式 GB/T 7714	Chen T.,Chen W.-L.,Foley B.J.,等. Origin of long lifetime of band-edge charge carriers in organic–inorganic lead iodide perovskites[J],2017,114(29).
APA	Chen T..,Chen W.-L..,Foley B.J..,Lee J..,Ruff J.P.C..,...&Lee S.-H..(2017).Origin of long lifetime of band-edge charge carriers in organic–inorganic lead iodide perovskites.Proceedings of the National Academy of Sciences of the United States of America,114(29).
MLA	Chen T.,et al."Origin of long lifetime of band-edge charge carriers in organic–inorganic lead iodide perovskites".Proceedings of the National Academy of Sciences of the United States of America 114.29(2017).