Relaxation Channels of Two Types of Hot Carriers in Gold Nanostructures

Relaxation Channels of Two Types of Hot Carriers in Gold Nanostructures

A fundamental understanding of hot carrier relaxation in metal nanostructures is essential for realizing their application potential in energy conversion and photocatalysis. Despite previous investigations of the relaxation of hot carriers generated by surface plasmon resonance (SPR) excitation and...

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Veröffentlicht in:Nano letters 2024-12, Vol.24 (48), p.15340-15347
Hauptverfasser: Zhao, Jie, Zhong, Yanyi, Zhang, Liyang, Sui, Laizhi, Wu, Guorong, Zhang, Jiangbin, Han, Kai, Zhang, Qi, Yuan, Kaijun, Yang, Xueming
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container_end_page 15347
container_issue 48
container_start_page 15340
container_title Nano letters
container_volume 24
creator Zhao, Jie
Zhong, Yanyi
Zhang, Liyang
Sui, Laizhi
Wu, Guorong
Zhang, Jiangbin
Han, Kai
Zhang, Qi
Yuan, Kaijun
Yang, Xueming
description A fundamental understanding of hot carrier relaxation in metal nanostructures is essential for realizing their application potential in energy conversion and photocatalysis. Despite previous investigations of the relaxation of hot carriers generated by surface plasmon resonance (SPR) excitation and interband transitions (IBTs), the hot carrier relaxation lifetimes and their associated mechanisms remain unclear. Herein, we demonstrate two distinct hot carrier relaxation channels in gold plasmonic nanostructures. The experimental observations reveal that the hot carrier relaxation is faster following SPR excitation than that from IBTs in gold nanoparticles and nanorods. The experimental results and theoretical calculations indicate that the numerous plasmon-induced hot carriers undergo surface-mediated carrier–carrier scattering in large gold nanostructures, whereas almost all IBT-induced hot carriers experience bulk carrier–carrier scattering. These findings advance our understanding of hot carrier relaxation and contribute to a clearer microscopic description of scattering channels in plasmonic nanostructures.
doi_str_mv 10.1021/acs.nanolett.4c04431
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title Relaxation Channels of Two Types of Hot Carriers in Gold Nanostructures
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