論文

2022年

Temperature-induced structural transition in an organic–inorganic hybrid layered perovskite (MA)2PbI2−xBrx(SCN)2

CrystEngComm
  • Takuya Ohmi
  • ,
  • Tomoaki Miura
  • ,
  • Kei Shigematsu
  • ,
  • Alexandra A. Koegel
  • ,
  • Brian S. Newell
  • ,
  • James R. Neilson
  • ,
  • Tadaaki Ikoma
  • ,
  • Masaki Azuma
  • ,
  • Takafumi Yamamoto

24
30
開始ページ
5428
終了ページ
5434
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1039/D2CE00733A
出版者・発行元
ROYAL SOC CHEMISTRY

Layered hybrid organic-inorganic halide perovskites have emerged as durable and tunable candidates for optoelectronic materials due to their outstanding properties. Here, we report the temperature-induced structural transition and photophysical properties of the layered perovskite (MA)(2)PbI2-xBrx(SCN)(2) (MA = CH3NH3; 0 <= x <= 1.2). Synchrotron X-ray diffraction measurements demonstrate that there is a first-order structural phase transition with an increase of the interlayer distance in (MA)(2)PbI2(SCN)(2) (x = 0) at 315 K. We attribute this transition to order-disorder transformations of the molecular ions, MA(+) and SCN-. The observed transition temperature decreases with Br substitution (from 320 K to 270 K), suggesting a weakening of bonding interaction between the molecular ions. A decrease in the decomposition temperature was also observed by Br substitution, indicating that the strength of interlayer bonding is coupled with the thermal stability of the layered perovskite. Photocurrent transient measurements for (MA)(2)PbI2(SCN)(2) reveal a dramatic decrease of the fast decay component upon heating, indicating that the structural transition decreases the carriers in the crystalline domain by random distortion of the perovskite layer derived from disordering of molecular ions. This study provides insight into the structure and photophysical properties of the thiocyanate layered perovskite family.


リンク情報
DOI
https://doi.org/10.1039/D2CE00733A
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000825019000001&DestApp=WOS_CPL
ID情報
  • DOI : 10.1039/D2CE00733A
  • eISSN : 1466-8033
  • ORCIDのPut Code : 115676439
  • Web of Science ID : WOS:000825019000001

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