Journal
NANO LETTERS
Volume 23, Issue 8, Pages 3501-3506Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.3c00622
Keywords
Photoluminescence; plasmon; ultrafast; hot holes; interband transitions
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In this study, time-resolved emission upconversion microscopy was used to investigate the lifetime and energy-dependent cooling of d-band holes formed in gold nanoparticles by plasmon excitation and decay.
The performance of photocatalysts and photovoltaic devices can be enhanced by energetic charge carriers produced from plasmon decay, and the lifetime of these energetic carriers greatly affects overall efficiencies. Although hot electron lifetimes in plasmonic gold nanoparticles have been investigated, hot hole lifetimes have not been as thoroughly studied in plasmonic systems. Here, we demonstrate time-resolved emission upconversion microscopy and use it to resolve the lifetime and energy-dependent cooling of d-band holes formed in gold nanoparticles by plasmon excitation and by following plasmon decay into interband and then intraband electron-hole pairs.
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