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Ultrafast correlated charge and lattice motion in a hybrid metal halide perovskite
McGill Univ, Canada.
McGill Univ, Canada.
McGill Univ, Canada.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
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2019 (English)In: Science Advances, E-ISSN 2375-2548, Vol. 5, no 5, article id eaaw5558Article in journal (Refereed) Published
Abstract [en]

Hybrid organic-inorganic halide perovskites have shown remarkable optoelectronic properties, exhibiting an impressive tolerance to defects believed to originate from correlated motion of charge carriers and the polar lattice forming large polarons. Few experimental techniques are capable of directly probing these correlations, requiring simultaneous sub-millielectron volt energy and femtosecond temporal resolution after absorption of a photon. Here, we use time-resolved multi-THz spectroscopy, sensitive to the internal excitations of 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 intraband quantum beats arising from the coherent displacement of charge from the coupled phonon cloud. Our measurements provide strong evidence for the existence of polarons in MAPI at room temperature, suggesting that electron/hole-phonon coupling is a defining aspect of the hybrid metal-halide perovskites contributing to the protection from scattering and enhanced carrier lifetimes that define their usefulness in devices.

Place, publisher, year, edition, pages
AMER ASSOC ADVANCEMENT SCIENCE , 2019. Vol. 5, no 5, article id eaaw5558
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:liu:diva-158577DOI: 10.1126/sciadv.aaw5558ISI: 000470125000118PubMedID: 31172030OAI: oai:DiVA.org:liu-158577DiVA, id: diva2:1334870
Note

Funding Agencies|NSERC; CFI; FQRNT; U.S. DOE, Office of Science [SC0012541]

Available from: 2019-07-03 Created: 2019-07-03 Last updated: 2019-11-06

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