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

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

Research output: Contribution to journalArticlepeer-review

75 Scopus Citations

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 languageAmerican English
Pages (from-to)2879-2887
Number of pages9
JournalJournal of Physical Chemistry Letters
Volume7
Issue number15
DOIs
StatePublished - 4 Aug 2016

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.

NREL Publication Number

  • NREL/JA-5900-66054

Keywords

  • isotope effects
  • organic-inorganic
  • perovskite
  • solar-photochemistry

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