Electron-Rotor Interaction in Organic-Inorganic Lead Iodide Perovskites Discovered by Isotope Effects

Jue Gong, Mengjin Yang, Xiangchao Ma, Richard D. Schaller, Gang Liu, Lingping Kong, Ye Yang, Matthew C. Beard, Michael Lesslie, Ying Dai, Baibiao Huang, Kai Zhu, Tao Xu

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)

Abstract

We report on the carrier-rotor coupling effect in perovskite organic-inorganic hybrid lead iodide (CH3NH3PbI3) compounds discovered by isotope effects. Deuterated organic-inorganic perovskite compounds including CH3ND3PbI3, CD3NH3PbI3, and CD3ND3PbI3 were synthesized. Devices made from regular CH3NH3PbI3 and deuterated CH3ND3PbI3 exhibit comparable performance in band gap, current-voltage, carrier mobility, and power conversion efficiency. However, a time-resolved photoluminescence (TRPL) study reveals that CH3NH3PbI3 exhibits notably longer carrier lifetime than that of CH3ND3PbI3, in both thin-film and single-crystal formats. Furthermore, the comparison in carrier lifetime between CD3NH3PbI3 and CH3ND3PbI3 single crystals suggests that vibrational modes in methylammonium (MA+) have little impact on carrier lifetime. In contrast, the fully deuterated compound CD3ND3PbI3 reconfirmed the trend of decreasing carrier lifetime upon the increasing moment of inertia of cationic MA+. Polaron model elucidates the electron-rotor interaction.

Original languageEnglish
Pages (from-to)2879-2887
Number of pages9
JournalJournal of Physical Chemistry Letters
Volume7
Issue number15
DOIs
Publication statusPublished - Aug 4 2016

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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