Effect of charge compensation on the photoelectrochemical properties of Ho-doped SrTiO3 films

Long Zhao*, Liang Fang, Wen Dong, Fengang Zheng, Mingrong Shen, Tom Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


When Ho3 ions are substituted at Sr2 sites in SrTiO3 (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.

Original languageEnglish (US)
Article number121905
JournalApplied Physics Letters
Issue number12
StatePublished - Mar 25 2013

Bibliographical note

Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 10904101, 11004146, and 91233109) and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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