TY - JOUR
T1 - Efficient Hot-Electron Transfer under Modal Strong Coupling Conditions with Sacrificial Electron Donors
AU - Cao, Yanfeng
AU - Oshikiri, Tomoya
AU - Shi, Xu
AU - Ueno, Kosei
AU - Li, Jie
AU - Misawa, Hiroaki
N1 - Funding Information:
We acknowledge financial support from JSPS KAKENHI (Grant Nos. JP18H05205, JP17H01041, JP18K05053, JP19H02737, and JP19H04667), the Nanotechnology Platform (Hokkaido University), and the Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials (Five-Star Alliance) of MEXT.
Publisher Copyright:
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/8
Y1 - 2019/8
N2 - In this study, we investigated the hot-electron transfer efficiency under modal strong coupling conditions by monitoring the photocurrent generated at a plasmonic photoanode. We fabricated a gold nanoparticles/titanium dioxide/gold film structure that shows a modal strong coupling between the Fabry−Pérot nanocavity mode and the localized surface plasmon and then explored the effect of the strong coupling on the incident photon-to-current conversion efficiency (IPCE) and internal quantum efficiency (IQE) in the presence of triethanolamine (TEOA) as a sacrificial electron donor to accelerate the surface reaction enough. The IPCEs for the upper and lower branches of the strong coupling were enhanced up to 4.5 and 4.0 times, respectively, by the addition of TEOA. Additionally, the average IQE with TEOA at wavelengths from 500 to 800 nm reached 3%. The Fermi level shifts due to the generation and consumption of hot-carriers were also discussed by comparing the in situ spectroelectrochemical measurements with and without TEOA.
AB - In this study, we investigated the hot-electron transfer efficiency under modal strong coupling conditions by monitoring the photocurrent generated at a plasmonic photoanode. We fabricated a gold nanoparticles/titanium dioxide/gold film structure that shows a modal strong coupling between the Fabry−Pérot nanocavity mode and the localized surface plasmon and then explored the effect of the strong coupling on the incident photon-to-current conversion efficiency (IPCE) and internal quantum efficiency (IQE) in the presence of triethanolamine (TEOA) as a sacrificial electron donor to accelerate the surface reaction enough. The IPCEs for the upper and lower branches of the strong coupling were enhanced up to 4.5 and 4.0 times, respectively, by the addition of TEOA. Additionally, the average IQE with TEOA at wavelengths from 500 to 800 nm reached 3%. The Fermi level shifts due to the generation and consumption of hot-carriers were also discussed by comparing the in situ spectroelectrochemical measurements with and without TEOA.
KW - Fermi level shift
KW - hot-electron transfer
KW - localized surface plasmon
KW - modal strong coupling
KW - photoelectric conversion
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U2 - 10.1002/cnma.201900178
DO - 10.1002/cnma.201900178
M3 - Article
AN - SCOPUS:85066913434
SN - 2199-692X
VL - 5
SP - 1008
EP - 1014
JO - ChemNanoMat
JF - ChemNanoMat
IS - 8
ER -
