Ultrafast correlated charge and lattice motion in a hybrid metal halide perovskite

Yang Lan, Benjamin J. Dringoli, David A. Valverde-Chavez, Carlito S. Ponseca, Mark Sutton, Yihui He, Mercouri G. Kanatzidis, David G. Cooke*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Hybrid organic-inorganic halide perovskites have shown remarkable optoelectronic properties (1-3), believed to originate from correlated motion of charge carriers and the polar lattice forming large polarons (4-7). Few experimental techniques are capable of probing these correlations directly, requiring simultaneous sub-meV energy and femtosecond temporal resolution after absorption of a photon (8). Here we use transient multi-THz spectroscopy, sensitive to the internal motions of charges within the polaron, to temporally and energetically resolve the coherent coupling of charges to longitudinal optical phonons in single crystal CH3NH3PbI3 (MAPI). We observe room temperature quantum beats arising from the coherent displacement of charge from the coupled phonon cloud. Our measurements provide unambiguous evidence of the existence of polarons in MAPI.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Dec 18 2018

ASJC Scopus subject areas

  • General

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