Xiaoqing Chen et al 2011 Sci. Technol. Adv. Mater. 12 044604 doi:10.1088/1468-6996/12/4/044604
Xiaoqing Chen1,2,3, Peng Li1,2,3, Hua Tong1,3, Tetsuya Kako2,3 and Jinhua Ye1,2,3
Show affiliationsA layered photoelectrode consisting of a conductive indium tin oxide substrate, a WO3 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 WO3 film. The optical absorption of the photoelectrode combined the intrinsic absorption of WO3 and plasmonic absorption of Au. Using this photoelectrode, we investigated the effect of the Au nanoprism array on the optoelectronic conversion performance of the WO3 film. Photoelectrochemical measurement indicated that the array substantially enhanced the photocurrent in the WO3 film. Electrochemical impedance measurements revealed that the Schottky junctions formed between Au and WO3 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.
78.67.Bf Nanocrystals and nanoparticles
82.45.Yz Nanostructured materials in electrochemistry
81.16.Rf Nanoscale pattern formation
Issue 4 (August 2011)
Received 2 March 2011, accepted for publication 15 April 2011
Published 7 July 2011
Total article downloads: 787
Xiaoqing Chen et al 2011 Sci. Technol. Adv. Mater. 12 044604