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 inJournal of physical chemistry. C Vol. 120; no. 10; pp. 5347 - 5352
Main Authors Tahara, Hirokazu, Endo, Masaru, Wakamiya, Atsushi, Kanemitsu, Yoshihiko
Format Journal Article
LanguageEnglish
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.
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
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  givenname: Hirokazu
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  surname: Endo
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  givenname: Yoshihiko
  surname: Kanemitsu
  fullname: Kanemitsu, Yoshihiko
  email: kanemitu@scl.kyoto-u.ac.jp
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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
URI http://dx.doi.org/10.1021/acs.jpcc.6b01283
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