Impact of Chemical Doping on Optical Responses in Bismuth-Doped CH3NH3PbBr3 Single Crystals: Carrier Lifetime and Photon Recycling

We studied the optical responses of organic–inorganic halide perovskite CH3NH3PbBr3 single crystals doped with heterovalent Bi3+ ions (electron densities up to 2.3 × 1012 cm–3). The Bi doping causes no significant changes in the band gap energy but leads to an enhanced Urbach tail and photoluminesce...

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Published inThe journal of physical chemistry letters Vol. 8; no. 23; pp. 5798 - 5803
Main Authors Yamada, Yasuhiro, Hoyano, Mizuki, Akashi, Ryo, Oto, Kenichi, Kanemitsu, Yoshihiko
Format Journal Article
LanguageEnglish
Published American Chemical Society 07.12.2017
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Summary:We studied the optical responses of organic–inorganic halide perovskite CH3NH3PbBr3 single crystals doped with heterovalent Bi3+ ions (electron densities up to 2.3 × 1012 cm–3). The Bi doping causes no significant changes in the band gap energy but leads to an enhanced Urbach tail and photoluminescence blue shift. On the basis of the time-resolved photoluminescence measurements, we attribute the PL response to a shorter carrier lifetime induced by Bi doping, which results in a reduced photon recycling effect (i.e., the repeated emission and reabsorption of photons inside the crystal). We discuss the physical relation between Bi concentration and the optical and electric properties of Bi-doped CH3NH3PbBr3 and reveal the unique nature of the Bi3+ ion as a dopant in halide perovskites.
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ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.7b02508