Enhancing the Hot-Phonon Bottleneck Effect in a Metal Halide Perovskite by Terahertz Phonon Excitation

We investigate the impact of phonon excitations on the photoexcited carrier dynamics in a lead-halide perovskite CH_{3}NH_{3}PbI_{3}, which hosts unique low-energy phonons that can be directly excited by terahertz pulses. Our time-resolved photoluminescence measurements reveal that strong terahertz...

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Published inPhysical review letters Vol. 126; no. 7; p. 077401
Main Authors Sekiguchi, Fumiya, Hirori, Hideki, Yumoto, Go, Shimazaki, Ai, Nakamura, Tomoya, Wakamiya, Atsushi, Kanemitsu, Yoshihiko
Format Journal Article
LanguageEnglish
Published United States 19.02.2021
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Summary:We investigate the impact of phonon excitations on the photoexcited carrier dynamics in a lead-halide perovskite CH_{3}NH_{3}PbI_{3}, which hosts unique low-energy phonons that can be directly excited by terahertz pulses. Our time-resolved photoluminescence measurements reveal that strong terahertz excitation prolongs the cooling time of hot carriers, providing direct evidence for the hot-phonon bottleneck effect. In contrast to the previous studies where phonons are treated as a passive heat bath, our results demonstrate that phonon excitation can significantly perturb the carrier relaxation dynamics in halide perovskites through the coupling between transverse- and longitudinal-optical phonons.
ISSN:1079-7114
DOI:10.1103/physrevlett.126.077401