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Origin of Long Lifetime of Band-Edge Charge Carriers in organic-Inorganic Lead Iodide Perovskites

Published

Author(s)

Tianran Chen, Wei-Liang Chen, Benjamin J. Foley, Jooseop Lee, Jacob P. C. Ruff, J. Y. Peter Ko, Craig Brown, Leland Harriger, Depei Zhang, Changwon Park, Mina Yoon, Yu-Ming Chang, Joshua J. Choi, Seung-Hun Lee

Abstract

Long carrier lifetime is what makes hybrid organic-inorganic perovskites (HOIPs) high performance photovoltaic materials. The microscopic mechanism behind the unusually long carrier lifetime of greater than equal to} 1 υs is not well understood. Here we show that the screening of band-edge charge carriers by rotation of organic cation molecules is a major contribution to the prolonged lifetime. By investigating temperature dependence of band-edge time-resolved photoluminescence and crystal structure of HC(NH2)2PbI3, we revealed that the band-edge carrier lifetime increases dramatically from approximately equal}1 ns to approximately equal}300 ns as the system enters into a phase with high rotational entropy. Thus, searching for HOIPs with high rotational entropy over a wide range of temperature may be a key to achieve superior solar cell performance.
Citation
Proceedings of the National Academy of Sciences of the United States of America
Volume
114
Issue
29

Keywords

solar cell, diffraction, dynamics

Citation

Chen, T. , Chen, W. , Foley, B. , Lee, J. , Ruff, J. , Ko, J. , Brown, C. , Harriger, L. , Zhang, D. , Park, C. , Yoon, M. , Chang, Y. , Choi, J. and Lee, S. (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, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=922735 (Accessed March 4, 2024)
Created July 16, 2017, Updated October 12, 2021