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Title: High Density n-Si/n-TiO2 Core/Shell Nanowire Arrays with Enhanced Photoactivity

Abstract

There are currently great needs to develop low-cost inorganic materials that can efficiently perform solar water splitting as photoelectrolysis of water into hydrogen and oxygen has significant potential to provide clean energy. We investigate the Si/TiO2 nanowire heterostructures to determine their potential for the photooxidation of water. We observed that highly dense Si/TiO2 core/shell nanowire arrays enhanced the photocurrent by 2.5 times compared to planar Si/TiO2 structure due to their low reflectance and high surface area. We also showed that n-Si/n-TiO2 nanowire arrays exhibited a larger photocurrent and open circuit voltage than p-Si/n-TiO2 nanowires due to a barrier at the heterojunction.

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Materials Sciences Division
OSTI Identifier:
960435
Report Number(s):
LBNL-1951E
Journal ID: ISSN 1530-6984; TRN: US200923%%440
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: American Chemical Society-Nano Letters; Journal Volume: 9; Journal Issue: 1; Related Information: Journal Publication Date: 12/01/2008
Country of Publication:
United States
Language:
English
Subject:
36; ELECTRIC POTENTIAL; HYDROGEN; OXYGEN; PHOTOCURRENTS; PHOTOELECTROLYSIS; SURFACE AREA; WATER; High Density n-Si/n-TiO2 Core/Shell Nanowire Arrays with Enhanced Photoactivity

Citation Formats

Hwang, Yun Jeong, Boukai, Akram, and Yang, Peidong. High Density n-Si/n-TiO2 Core/Shell Nanowire Arrays with Enhanced Photoactivity. United States: N. p., 2008. Web.
Hwang, Yun Jeong, Boukai, Akram, & Yang, Peidong. High Density n-Si/n-TiO2 Core/Shell Nanowire Arrays with Enhanced Photoactivity. United States.
Hwang, Yun Jeong, Boukai, Akram, and Yang, Peidong. Sat . "High Density n-Si/n-TiO2 Core/Shell Nanowire Arrays with Enhanced Photoactivity". United States. doi:. https://www.osti.gov/servlets/purl/960435.
@article{osti_960435,
title = {High Density n-Si/n-TiO2 Core/Shell Nanowire Arrays with Enhanced Photoactivity},
author = {Hwang, Yun Jeong and Boukai, Akram and Yang, Peidong},
abstractNote = {There are currently great needs to develop low-cost inorganic materials that can efficiently perform solar water splitting as photoelectrolysis of water into hydrogen and oxygen has significant potential to provide clean energy. We investigate the Si/TiO2 nanowire heterostructures to determine their potential for the photooxidation of water. We observed that highly dense Si/TiO2 core/shell nanowire arrays enhanced the photocurrent by 2.5 times compared to planar Si/TiO2 structure due to their low reflectance and high surface area. We also showed that n-Si/n-TiO2 nanowire arrays exhibited a larger photocurrent and open circuit voltage than p-Si/n-TiO2 nanowires due to a barrier at the heterojunction.},
doi = {},
journal = {American Chemical Society-Nano Letters},
number = 1,
volume = 9,
place = {United States},
year = {Sat Nov 15 00:00:00 EST 2008},
month = {Sat Nov 15 00:00:00 EST 2008}
}