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

Sheng, Xia; Chen, Liping; Xu, Tao; Zhu, Kai; Feng, Xinjian

doi:10.1039/c5sc04076k

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

Journal Article · Tue Dec 08 00:00:00 EST 2015 · Chemical Science

DOI:https://doi.org/10.1039/c5sc04076k· OSTI ID:1242682

Sheng, Xia ^[1]; Chen, Liping ^[1]; Xu, Tao ^[2]; Zhu, Kai ^[3]; Feng, Xinjian ^[1]

Soochow Univ. (China)
Northern Illinois Univ., DeKalb, IL (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)

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.

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Research Organization:: National Renewable Energy Lab. (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1242682

Report Number(s):: NREL-JA-5900-66161; MainId:16876; UUID:66ef7464-f0ea-e511-97db-d89d67132a6d; MainAdminID:5354

Journal Information:: Chemical Science, Vol. 7, Issue 3; Related Information: Chemical Science; ISSN 2041-6520

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 27 works

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Tailoring TiO ₂ Nanotube-Interlaced Graphite Carbon Nitride Nanosheets for Improving Visible-Light-Driven Photocatalytic Performance Wang, Yang; Liu, Xueqin; Zheng, Cunchuan Advanced Science, Vol. 5, Issue 6 https://doi.org/10.1002/advs.201700844	journal	April 2018
Novel 3D Semiconducting Open-Frameworks based on Cuprous Bromides with Visible Light Driven Photocatalytic Properties Lei, Xiao-Wu; Yue, Cheng-Yang; Wei, Jun-Chao Chemistry - A European Journal, Vol. 23, Issue 58 https://doi.org/10.1002/chem.201702736	journal	September 2017
Recent Progress on Titanium Dioxide Nanomaterials for Photocatalytic Applications Nasr, Maryline; Eid, Cynthia; Habchi, Roland ChemSusChem, Vol. 11, Issue 18 https://doi.org/10.1002/cssc.201800874	journal	August 2018
Investigation of the physical properties of Fe:TiO ₂ -diluted magnetic semiconductor nanoparticles Prajapati, Brijmohan; Kumar, Shiv; Kumar, Manish Journal of Materials Chemistry C, Vol. 5, Issue 17 https://doi.org/10.1039/c7tc00233e	journal	January 2017
Photocatalytic hydrogen generation on low-bandgap black zirconia (ZrO ₂ ) produced by high-pressure torsion Wang, Qing; Edalati, Kaveh; Koganemaru, Yuta Journal of Materials Chemistry A, Vol. 8, Issue 7 https://doi.org/10.1039/c9ta11839j	journal	January 2020

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