Skip to main content Accessibility help
×
Home
Hostname: page-component-7ccbd9845f-mpxzb Total loading time: 0.271 Render date: 2023-01-30T22:44:07.997Z Has data issue: true Feature Flags: { "useRatesEcommerce": false } hasContentIssue true

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
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
Get access

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.

Type
Research Article
Copyright
Copyright © Materials Research Society 2012

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

(1) Fujishima, A.; Honda, K. Nature 1972, 238, 3738.CrossRefGoogle Scholar
(2) Alexander, B. D.; Kulesza, P. J.; Rutkowska, L.; Solarska, R.; Augustynski, J. Journal Of Materials Chemistry 2008, 18, 22982303.CrossRefGoogle Scholar
(3) Hensel, J.; Wang, G.; Li, Y.; Zhang, J. Z. Nano letters 2010, 10, 478483.CrossRefGoogle Scholar
(4) Larsen, G.; Fitzmorris, R. C.; Zhang, J. Z.; Zhao, Y. The Journal of Physical Chemistry C.Google Scholar
(5) Chen, X.; Liu, L.; Yu, P. Y.; Mao, S. S. Science 2011, 331, 746750.CrossRefGoogle Scholar
(6) Wang, G.; Wang, H.; Ling, Y.; Tang, Y.; Yang, X.; Fitzmorris, R. C.; Wang, C.; Zhang, J. Z.; Li, Y. Nano Letters 2011, 11, 30263033.CrossRefGoogle Scholar
(7) Liu, B.; Aydil, E. S. Journal of the American Chemical Society 2009, 131, 39853990.CrossRefGoogle Scholar
(8) Newhouse, R. J.; Wang, H.; Hensel, J. K.; Wheeler, D. A.; Zou, S.; Zhang, J. Z. The Journal of Physical Chemistry Letters 2011, 2, 228.CrossRefGoogle Scholar
(9) Chen, C.; Huang, Y.; Chung, W.; Tsai, D.; Tiong, K. Journal of Materials Science: Materials in Electronics 2009, 20, 303306.Google Scholar
(10) Colombo, D. P.; Bowman, R. M. The Journal of Physical Chemistry 1996, 100, 1844518449.CrossRefGoogle Scholar
(11) Rothenberger, G.; Moser, J.; Graetzel, M.; Serpone, N.; Sharma, D. K. Journal of the American Chemical Society 1985, 107, 80548059.CrossRefGoogle Scholar
(12) Serpone, N.; Lawless, D.; Khairutdinov, R.; Pelizzetti, E. The Journal of Physical Chemistry 1995, 99, 1665516661.CrossRefGoogle Scholar
(13) Zhou, W.-c.; Li, Z.-c.; Zhang, Z.-j.; Onda, K.; Ogihara, S.; Okimoto, Y.; Koshihara, S.-y. Frontiers of Materials Science in China 2009, 3, 403408.CrossRefGoogle Scholar
(14) Cronemeyer, D. C. Physical Review 1959, 113, 12221226.CrossRefGoogle Scholar
(15) Cronemeyer, D. C.; Gilleo, M. A. Physical Review 1951, 82, 975976.CrossRefGoogle Scholar
(16) Kim, W.-T.; Kim, C.-D.; Choi, Q. W. Physical Review B 1984, 30, 36253628.CrossRefGoogle Scholar
(17) Nakamura, R.; Nakato, Y. Journal of the American Chemical Society 2004, 126, 12901298.CrossRefGoogle Scholar
(18) Imanishi, A.; Okamura, T.; Ohashi, N.; Nakamura, R.; Nakato, Y. Journal of the American Chemical Society 2007, 129, 1156911578.CrossRefGoogle Scholar

Save article to Kindle

To save this article to your Kindle, first ensure coreplatform@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.

Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

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

Save article to Dropbox

To save this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you used this feature, you will be asked to authorise Cambridge Core to connect with your Dropbox account. Find out more about saving content to Dropbox.

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

Save article to Google Drive

To save this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you used this feature, you will be asked to authorise Cambridge Core to connect with your Google Drive account. Find out more about saving content to Google Drive.

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

Reply to: Submit a response

Please enter your response.

Your details

Please enter a valid email address.

Conflicting interests

Do you have any conflicting interests? *