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

Published

July 17, 2017

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

Pub Type

Journals

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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 October 14, 2025)