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Heterointegration of Pt/Si/Ag Nanowire Photodiodes and Their Photocatalytic Properties

Qu, Yongquan and Xue, Teng and Zhong, Xin and Lin, Yung-Chen and Liao, Lei and Choi, Jina and Duan, Xiangfeng (2010) Heterointegration of Pt/Si/Ag Nanowire Photodiodes and Their Photocatalytic Properties. Advanced Functional Materials, 20 (18). pp. 3005-3011. ISSN 1616-301X. PMCID PMC3099239.

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Photocatalyst mediated photoelectrochemical processes can make use of the photogenerated electrons and holes onsite for photocatalytic redox reactions, and enable the harness and conversion of solar energy into chemical energy, in analogy to natural photosynthesis. However, the photocatalysts available to date are limited by either poor efficiency in the visible light range or insufficient photoelectrochemical stability. Here, it is shown that a Pt/Si/Ag nanowire heterostructure can be rationally synthesized to integrate a nanoscale metal-semiconductor Schottky diode encased in a protective insulating shell with two exposed metal catalysts. The synthesis of Pt/Si/Ag nanowire diodes involves a scalable process including the formation of silicon nanowire array through wet chemical etching, electrodeposition of platinum and photoreduction of silver. The Pt/Si/Ag diodes exhibit highly efficient photocatalytic activity for a wide range of applications including environmental remediation and solar fuel production in the visible range. In this article, photodegradation of indigo carmine and 4-nitrophenol are used to evaluate the photoactivity of Pt/Si/Ag diodes. The Pt/Si/Ag diodes also show high activity for photoconversion of formic acid into carbon dioxide and hydrogen.

Item Type:Article
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URLURL TypeDescription CentralArticle
Duan, Xiangfeng0000-0002-4321-6288
Additional Information:© 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Received: April 30, 2010. Revised: June 7, 2010. Published online: July 22, 2010. We acknowledge support by the NIH Director’s New Innovator Award Program, part of the NIH Roadmap for Medical Research, through Grant 1DP2OD004342-01. We acknowledge Electron Imaging Center for Nanomachines (EICN) at UCLA for support for TEM, Nanoelectronics Research Facility at UCLA for support of etching process. We are grateful to Professor Michael R. Hoffmann for hydrogen quantification equipment.
Funding AgencyGrant Number
Subject Keywords:nanowires; heterostructures; photodiodes; photocatalysis
Issue or Number:18
PubMed Central ID:PMC3099239
Record Number:CaltechAUTHORS:20101103-073859741
Persistent URL:
Official Citation:Qu, Y., Xue, T., Zhong, X., Lin, Y.-C., Liao, L., Choi, J. and Duan, X. (2010), Heterointegration of Pt/Si/Ag Nanowire Photodiodes and Their Photocatalytic Properties. Advanced Functional Materials, 20: 3005–3011. doi: 10.1002/adfm.201000857
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20643
Deposited By: Ruth Sustaita
Deposited On:03 Nov 2010 15:46
Last Modified:09 Mar 2020 13:18

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