Nanoarchitectonics of a Au nanoprism array on WO3 film for synergistic optoelectronic response

A layered photoelectrode consisting of a conductive indium tin oxide substrate, a WO 3 nanocrystalline film and an array of Au nanoprisms was fabricated via a multistep process. Scanning electron microscopy and atomic force microscopy showed that the Au nanoprisms had a uniform size and shape and fo...

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Bibliographic Details
Published in:Science and technology of advanced materials 2011-08, Vol.12 (4), p.044604-044604
Main Authors: Chen, Xiaoqing, Li, Peng, Tong, Hua, Kako, Tetsuya, Ye, Jinhua
Format: Article
Language:English
Subjects:
Absorption
Arrays
Atomic force microscopy
Au nanoprism array
Conversion
Focus Papers
Gold
Indium tin oxides
localized surface plasmon resonance
Microscopy
Nanoparticles
Noble metals
optoelectronic conversion
Optoelectronics
Photoelectric effect
Photoelectric emission
Plasmonics
Substrates
Tungsten oxides
WO3 film
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Summary:A layered photoelectrode consisting of a conductive indium tin oxide substrate, a WO 3 nanocrystalline film and an array of Au nanoprisms was fabricated via a multistep process. Scanning electron microscopy and atomic force microscopy showed that the Au nanoprisms had a uniform size and shape and formed periodic hexagonal patterns on the WO 3 film. The optical absorption of the photoelectrode combined the intrinsic absorption of WO 3 and plasmonic absorption of Au. Using this photoelectrode, we investigated the effect of the Au nanoprism array on the optoelectronic conversion performance of the WO 3 film. Photoelectrochemical measurement indicated that the array substantially enhanced the photocurrent in the WO 3 film. Electrochemical impedance measurements revealed that the Schottky junctions formed between Au and WO 3 can facilitate the separation of photogenerated carriers as well as the interfacial carrier transfer. In this study, we demonstrate that covering a semiconductor with plasmonic noble metal nanoparticles can improve its optoelectronic conversion efficiency.
ISSN:1468-6996
1878-5514
DOI:10.1088/1468-6996/12/4/044604