Extracting the limiting factors in photocurrent measurements on TiO2 nanotubes and enhancing the photoelectrochemical properties by Nb doping

Özkan S, Mazare AV, Schmuki P (2015)


Publication Type: Journal article

Publication year: 2015

Journal

Book Volume: 176

Pages Range: 819-826

DOI: 10.1016/j.electacta.2015.07.023

Abstract

In the present work, we extract the key factors that influence and limit the photoresponse of anodic TiO2 nanotubular layers. For this we formed nanotube layers of different thicknesses, annealed the structures at different temperatures and evaluated the doping effect of Nb. Using various analytical characterization tools (SEM, XRD, XPS, ToF-SIMS), we found that a most crucial impact on limiting the photoresponse in nanotubular layers is the formation of a rutile layer at the metal/oxide interface during the thermal annealing process (by thermal oxidation of Ti metal underneath tubes). This rutile layer increases severely in thickness with annealing temperature. We show that this detrimental effect can be overcome by doping the TiO2 NTs with very low amounts of Nb (0.1 at% Nb), which can result in a 12-fold increase of the IPCE for high temperature annealed TiO2 NTs.

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APA:

Özkan, S., Mazare, A.V., & Schmuki, P. (2015). Extracting the limiting factors in photocurrent measurements on TiO2 nanotubes and enhancing the photoelectrochemical properties by Nb doping. Electrochimica Acta, 176, 819-826. https://doi.org/10.1016/j.electacta.2015.07.023

MLA:

Özkan, Selda, Anca Valentina Mazare, and Patrik Schmuki. "Extracting the limiting factors in photocurrent measurements on TiO2 nanotubes and enhancing the photoelectrochemical properties by Nb doping." Electrochimica Acta 176 (2015): 819-826.

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