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Title: Effect of charge compensation on the photoelectrochemical properties of Ho-doped SrTiO{sub 3} films

Abstract

When Ho{sup 3+} ions are substituted at Sr{sup 2+} sites in SrTiO{sub 3} (STO), the excess positive charges are compensated via three complementary routes: (1) strontium vacancies, (2) titanium vacancies, and (3) conduction electrons. In this study, we show that the photoelectrochemical properties of Ho-doped STO films are dependent on the charge compensation mechanisms. The compensation mechanism via the titanium vacancies exhibits the highest photocurrent density, which is 1.7 times higher than that of the pure STO sample. Based on the measured dielectric properties and electrochemical impedance spectroscopy data, we propose that the enhanced dielectric constant of the films can enlarge the width of the space charge region at the film/liquid interface, which eventually leads to the increase of the photocurrent density. Further enhancement of photocurrent density is obtained in the samples decorated with appropriate amounts of Pt nanoparticles, showing the advantage of composites for achieving the efficient photoelectrochemical property.

Authors:
; ; ; ;  [1];  [2]
  1. Jiangsu Key Laboratory of Thin Films and Department of Physics, Soochow University, Suzhou 215006 (China)
  2. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371 (Singapore)
Publication Date:
OSTI Identifier:
22162809
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 102; Journal Issue: 12; Other Information: (c) 2013 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COMPOSITE MATERIALS; CRYSTALS; DOPED MATERIALS; ELECTROCHEMISTRY; ELECTRONS; HOLMIUM ADDITIONS; IMPEDANCE; INTERFACES; NANOSTRUCTURES; PERMITTIVITY; PHOTOCONDUCTIVITY; PLATINUM; SPACE CHARGE; SPECTROSCOPY; STRONTIUM TITANATES; THIN FILMS; VACANCIES

Citation Formats

Zhao, Long, Fang, Liang, Dong, Wen, Zheng, Fengang, Shen, Mingrong, and Wu, Tom. Effect of charge compensation on the photoelectrochemical properties of Ho-doped SrTiO{sub 3} films. United States: N. p., 2013. Web. doi:10.1063/1.4798829.
Zhao, Long, Fang, Liang, Dong, Wen, Zheng, Fengang, Shen, Mingrong, & Wu, Tom. Effect of charge compensation on the photoelectrochemical properties of Ho-doped SrTiO{sub 3} films. United States. https://doi.org/10.1063/1.4798829
Zhao, Long, Fang, Liang, Dong, Wen, Zheng, Fengang, Shen, Mingrong, and Wu, Tom. 2013. "Effect of charge compensation on the photoelectrochemical properties of Ho-doped SrTiO{sub 3} films". United States. https://doi.org/10.1063/1.4798829.
@article{osti_22162809,
title = {Effect of charge compensation on the photoelectrochemical properties of Ho-doped SrTiO{sub 3} films},
author = {Zhao, Long and Fang, Liang and Dong, Wen and Zheng, Fengang and Shen, Mingrong and Wu, Tom},
abstractNote = {When Ho{sup 3+} ions are substituted at Sr{sup 2+} sites in SrTiO{sub 3} (STO), the excess positive charges are compensated via three complementary routes: (1) strontium vacancies, (2) titanium vacancies, and (3) conduction electrons. In this study, we show that the photoelectrochemical properties of Ho-doped STO films are dependent on the charge compensation mechanisms. The compensation mechanism via the titanium vacancies exhibits the highest photocurrent density, which is 1.7 times higher than that of the pure STO sample. Based on the measured dielectric properties and electrochemical impedance spectroscopy data, we propose that the enhanced dielectric constant of the films can enlarge the width of the space charge region at the film/liquid interface, which eventually leads to the increase of the photocurrent density. Further enhancement of photocurrent density is obtained in the samples decorated with appropriate amounts of Pt nanoparticles, showing the advantage of composites for achieving the efficient photoelectrochemical property.},
doi = {10.1063/1.4798829},
url = {https://www.osti.gov/biblio/22162809}, journal = {Applied Physics Letters},
issn = {0003-6951},
number = 12,
volume = 102,
place = {United States},
year = {Mon Mar 25 00:00:00 EDT 2013},
month = {Mon Mar 25 00:00:00 EDT 2013}
}