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Title: Enhancing the Hot-Phonon Bottleneck Effect in a Metal Halide Perovskite by Terahertz Phonon Excitation
Authors: Sekiguchi, Fumiya
Hirori, Hideki
Yumoto, Go
Shimazaki, Ai
Nakamura, Tomoya  kyouindb  KAKEN_id
Wakamiya, Atsushi  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0003-1430-0947 (unconfirmed)
Kanemitsu, Yoshihiko
Author's alias: 関口, 文哉
廣理, 英基
湯本, 郷
嶋﨑, 愛
中村, 智也
若宮, 淳志
金光, 義彦
Issue Date: 19-Feb-2021
Publisher: American Physical Society (APS)
Journal title: Physical Review Letters
Volume: 126
Issue: 7
Thesis number: 077401
Abstract: We investigate the impact of phonon excitations on the photoexcited carrier dynamics in a lead-halide perovskite CH3NH3PbI3, 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.
Description: ハライドペロブスカイト半導体においてテラヘルツ励起によるホットキャリアの長寿命化を実現 --太陽電池材料のフォノン操作による高効率化への新たな指針--. 京都大学プレスリリース. 2021-02-19.
Rights: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
URI: http://hdl.handle.net/2433/261721
DOI(Published Version): 10.1103/physrevlett.126.077401
Related Link: https://www.kyoto-u.ac.jp/ja/research-news/2021-02-19
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