Experimental Evidence of Localized Shallow States in Orthorhombic Phase of CH3NH3PbI3 Perovskite Thin Films Revealed by Photocurrent Beat Spectroscopy
We demonstrate evidence of localized states near the band edge of lead halide perovskite semiconductor CH3NH3PbI3 thin films. In these films, the high-temperature tetragonal and the low-temperature orthorhombic phases coexist at low temperatures. We determine the exact energy level of the localized...
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Published in | Journal of physical chemistry. C Vol. 120; no. 10; pp. 5347 - 5352 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
American Chemical Society
17.03.2016
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Abstract | We demonstrate evidence of localized states near the band edge of lead halide perovskite semiconductor CH3NH3PbI3 thin films. In these films, the high-temperature tetragonal and the low-temperature orthorhombic phases coexist at low temperatures. We determine the exact energy level of the localized states in the orthorhombic phase via photocurrent (PC) beat spectroscopy. The lack of observation of localized states in photoluminescence and absorption measurements indicates that the density of the localized states is fairly low even in solution-processed polycrystalline films. Ultrafast PC spectroscopy enables us to monitor low-density localized states in inhomogeneous polycrystalline films. |
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AbstractList | We demonstrate evidence of localized states near the band edge of lead halide perovskite semiconductor CH3NH3PbI3 thin films. In these films, the high-temperature tetragonal and the low-temperature orthorhombic phases coexist at low temperatures. We determine the exact energy level of the localized states in the orthorhombic phase via photocurrent (PC) beat spectroscopy. The lack of observation of localized states in photoluminescence and absorption measurements indicates that the density of the localized states is fairly low even in solution-processed polycrystalline films. Ultrafast PC spectroscopy enables us to monitor low-density localized states in inhomogeneous polycrystalline films. |
Author | Tahara, Hirokazu Endo, Masaru Wakamiya, Atsushi Kanemitsu, Yoshihiko |
AuthorAffiliation | Kyoto University Institute for Chemical Research |
AuthorAffiliation_xml | – name: Institute for Chemical Research – name: Kyoto University |
Author_xml | – sequence: 1 givenname: Hirokazu surname: Tahara fullname: Tahara, Hirokazu – sequence: 2 givenname: Masaru surname: Endo fullname: Endo, Masaru – sequence: 3 givenname: Atsushi surname: Wakamiya fullname: Wakamiya, Atsushi – sequence: 4 givenname: Yoshihiko surname: Kanemitsu fullname: Kanemitsu, Yoshihiko email: kanemitu@scl.kyoto-u.ac.jp |
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Copyright | Copyright © 2016 American
Chemical Society |
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DOI | 10.1021/acs.jpcc.6b01283 |
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Snippet | We demonstrate evidence of localized states near the band edge of lead halide perovskite semiconductor CH3NH3PbI3 thin films. In these films, the... |
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Title | Experimental Evidence of Localized Shallow States in Orthorhombic Phase of CH3NH3PbI3 Perovskite Thin Films Revealed by Photocurrent Beat Spectroscopy |
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