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Issue 3, 2016
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Understanding and removing surface states limiting charge transport in TiO2 nanowire arrays for enhanced optoelectronic device performance

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Abstract

Charge transport within electrode materials plays a key role in determining the optoelectronic device performance. Aligned single-crystal TiO2 nanowire arrays offer an ideal electron transport path and are expected to have higher electron mobility. Unfortunately, their transport is found not to be superior to that in nanoparticle films. Here we show that the low electron transport in rutile TiO2 nanowires is mainly caused by surface traps in relatively deep energy levels, which cannot be removed by conventional approaches, such as oxygen annealing treatment. Moreover, we demonstrate an effective wet-chemistry approach to minimize these trap states, leading to over 20-fold enhancement in electron diffusion coefficient and 62% improvement in solar cell performance. On the basis of our results, the potential of TiO2 NWs can be developed and well-utilized, which is significantly important for their practical applications.

Graphical abstract: Understanding and removing surface states limiting charge transport in TiO2 nanowire arrays for enhanced optoelectronic device performance

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Supplementary files

Article information


Submitted
27 Oct 2015
Accepted
08 Dec 2015
First published
08 Dec 2015

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2016,7, 1910-1913
Article type
Edge Article
Author version available

Understanding and removing surface states limiting charge transport in TiO2 nanowire arrays for enhanced optoelectronic device performance

X. Sheng, L. Chen, T. Xu, K. Zhu and X. Feng, Chem. Sci., 2016, 7, 1910
DOI: 10.1039/C5SC04076K

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    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
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    [Original citation] - Published by The Royal Society of Chemistry.

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