Significant broadband photocurrent enhancement by Au-CZTS core-shell nanostructured photocathodes

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Title: Significant broadband photocurrent enhancement by Au-CZTS core-shell nanostructured photocathodes
Authors: Zhang, X
Wu, X
Centeno, A
Ryan, M
Alford, N
Riley, D
Xie, F
Item Type: Journal Article
Abstract: Copper zinc tin sulfide (CZTS) is a promising material for harvesting solar energy due to its abundance and non-toxicity. However, its poor performance hinders their wide application. In this paper gold (Au) nanoparticles are successfully incorporated into CZTS to form Au@CZTS core-shell nanostructures. The photocathode of Au@CZTS nanostructures exhibits enhanced optical absorption characteristics and improved incident photon-to-current efficiency (IPCE) performance. It is demonstrated that using this photocathode there is a significant increase of the power conversion efficiency (PCE) of a photoelectrochemical solar cell of 100% compared to using a CZTS without Au core. More importantly, the PCE of Au@CZTS photocathode improved by 15.8% compared to standard platinum (Pt) counter electrode. The increased efficiency is attributed to plasmon resonance energy transfer (PRET) between the Au nanoparticle core and the CZTS shell at wavelengths shorter than the localized surface plasmon resonance (LSPR) peak of the Au and the semiconductor bandgap.
Issue Date: 21-Mar-2016
Date of Acceptance: 3-Mar-2016
URI: http://hdl.handle.net/10044/1/52464
DOI: https://dx.doi.org/10.1038/srep23364
ISSN: 2045-2322
Publisher: Nature Publishing Group
Journal / Book Title: Scientific Reports
Volume: 6
Copyright Statement: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/G060940/1
Keywords: Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
SENSITIZED SOLAR-CELLS
COUNTER ELECTRODES
FLUORESCENCE ENHANCEMENT
NANOCRYSTALS
FABRICATION
GENERATION
FILMS
WATER
Publication Status: Published
Article Number: 23364
Appears in Collections:Faculty of Engineering
Materials
Faculty of Natural Sciences



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