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Ultrafast Charge Carrier Dynamics and Photoelectrochemical Properties of Hydrogen-treated TiO2 Nanowire Arrays

Published online by Cambridge University Press:  18 April 2012

Damon A. Wheeler ,
Gongming Wang ,
Bob C. Fitzmorris ,
Staci A. Adams ,
Yat Li  and
Jin Z. Zhang
Damon A. Wheeler
Affiliation:
Department of Chemistry and Biochemistry, University of California, Santa Cruz, Santa Cruz, CA 95064
Gongming Wang
Affiliation:
Department of Chemistry and Biochemistry, University of California, Santa Cruz, Santa Cruz, CA 95064
Bob C. Fitzmorris
Affiliation:
Department of Chemistry and Biochemistry, University of California, Santa Cruz, Santa Cruz, CA 95064
Staci A. Adams
Affiliation:
Department of Chemistry and Biochemistry, University of California, Santa Cruz, Santa Cruz, CA 95064
Yat Li*
Affiliation:
Department of Chemistry and Biochemistry, University of California, Santa Cruz, Santa Cruz, CA 95064
Jin Z. Zhang*
Affiliation:
Department of Chemistry and Biochemistry, University of California, Santa Cruz, Santa Cruz, CA 95064
*
*Corresponding Author: yli@chemistry.ucsc.edu, Tel: (831) 459-1952; zhang@ucsc.edu, Tel: (831) 459-3776
*Corresponding Author: yli@chemistry.ucsc.edu, Tel: (831) 459-1952; zhang@ucsc.edu, Tel: (831) 459-3776
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Abstract

Here we report studies of photoelectrochemical (PEC) properties and ultrafast charge carrier relaxation dynamics of hydrogen-treated TiO2 (H:TiO2) nanowire arrays. PEC measurements showed the photocurrent density of the H:TiO2 was approximately double that of TiO2, attributed to increased donor density due to the formation of oxygen vacancies in H:TiO2 due to hydrogen treatment Charge carrier dynamics of H:TiO2, measured using fs transient absorption spectroscopy, showed a fast decay of ∼20 ps followed by slower decay persisting to tens of picoseconds. The fast decay is attributed to bandedge electron-hole recombination and the slower decay is attributed to recombination from trap states. Visible absorption is attributed to either electronic transitions from the valence band to oxygen vacancy states or from oxygen vacancy states to the conduction band of the TiO2, which is supported by incident photon to current conversion efficiency (IPCE) data. H:TiO2 represents a unique material with improved photoelectrochemical properties for applications including PEC water splitting, solar cells, and photocatalysis.

Keywords

absorptionlaserTi
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1387: Symposium E – Advanced Materials for Solar-Fuel Generation , 2012 , mrsf11-1387-e04-07
Copyright
Copyright © Materials Research Society 2012

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References

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