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JETP Letters

, Volume 109, Issue 1, pp 28–32 | Cite as

Terahertz Vibrational Modes in CH3NH3PbI3 and CsPbI3 Perovskite Films

  • A. V. AndrianovEmail author
  • A. N. Aleshin
  • L. B. Matyushkin
Condensed Matter
  • 4 Downloads

Abstract

Films of CH3NH3PbI3 organometallic perovskite, which is currently considered as a promising basic material for new-generation solar cells, as well as films containing CsPbI3 inorganic lead–halid perovskite nanocrystals, have been studied in the spectral range of 0.2–2.9 THz at room temperature by terahertz time-domain spectroscopy. Several low-frequency vibrational modes previously attributed exclusively to vibrations of Pb–I bonds have been observed in the perovskite films under investigation in this spectral range. The comparison of terahertz characteristics of perovskites under study has shown that vibrations associated with a cation (CH3 NH3+, Cs+) make a significant contribution to the formation of the observed low-frequency vibrational modes in perovskites under consideration.

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Copyright information

© Pleiades Publishing, Inc. 2019

Authors and Affiliations

  • A. V. Andrianov
    • 1
    Email author
  • A. N. Aleshin
    • 1
  • L. B. Matyushkin
    • 2
  1. 1.Ioffe Physical–Technical InstituteRussian Academy of SciencesSt. PetersburgRussia
  2. 2.St. Petersburg State Electrotechnical University LETISt. PetersburgRussia

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