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Elucidating the sole contribution from electromagnetic near-fields in plasmon-enhanced Cu2O photocathodes

Journal Article · · Advanced Energy Materials

Despite many promising reports of plasmon-enhanced photocatalysis, the inability to identify the individual contributions from multiple enhancement mechanisms has delayed the development of general design rules for engineering efficient plasmonic photocatalysts. Herein, we construct a plasmonic photocathode comprised of Au@SiO2 (core@shell) nanoparticles embedded within a Cu2O nanowire network to exclusively examine the contribution from one such mechanism: electromagnetic near-field enhancement. The influence of the local electromagnetic field intensity is correlated with the overall light-harvesting efficiency of the device through variation of the SiO2 shell thickness (5—22 nm) to systematically tailor the distance between the plasmonic Au nanoparticles and the Cu2O nanowires. A three-fold increase in device photocurrent is achieved upon integrating the Au@SiO2 nanoparticles into the Cu2O nanowire network, further enabling a ~40% reduction in semiconductor film thickness while maintaining photocathode performance. Photoelectrochemical results are further correlated with photoluminescence studies and optical simulations to confirm that the near-field enhancement is the sole mechanism responsible for increased light absorption in the plasmonic photocathode.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI ID:
1224787
Report Number(s):
BNL--108525-2015-JA; KC0403020
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 19 Vol. 115; ISSN 1614-6832
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Plasmon‐Enhanced Photoelectrochemical Water Splitting for Efficient Renewable Energy Storage journal December 2018
Quinone and its derivatives for energy harvesting and storage materials journal January 2016
Plasmon-dominated photoelectrodes for solar water splitting journal January 2017
Plasmon-driven water splitting enhancement on plasmonic metal–insulator–semiconductor hetero-nanostructures: unraveling the crucial role of interfacial engineering journal January 2018
Multi-interfacial plasmon coupling in multigap (Au/AgAu)@CdS core–shell hybrids for efficient photocatalytic hydrogen generation journal January 2020

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