Multipodal and multilayer TiO2 nanotube arrays: Hierarchical structures for energy harvesting and sensing

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DOIResolve DOI: http://doi.org/10.1557/opl.2013.584
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TypeArticle
Proceedings title2013 MRS Spring Meeting - Symposium S – Nanostructured Metal Oxides for Advanced Applications
Series titleMaterials Research Society Symposium Proceedings; no. 1552
Conference2013 MRS Spring Meeting, 1 April 2013 through 5 April 2013, San Francisco, CA
ISSN0272-9172
ISBN9781605115290
Pages2934; # of pages: 6
AbstractOur ability to fabricate multipodal and multilayer TiO2 nanotube arrays enables us to increase performance and functionality in light harvesting devices such as excitonic solar cells and photocatalysts. Using a combination of simulations and experiments, we show that multilayer nanotube arrays enable photon management in the active toward enhancing the absorption and utilization of incident light. We show that the simultaneous utilization of TiO2 nanotubes with large (∼450 nm) and small (∼80 nm) diameters in stacked multilayer films increased light absorption and photocurrent in solar cells. Such enhanced light absorption is particularly desirable in the near-infrared region of the solar spectrum in which most excitonic solar cells suffer from poor quantum efficiencies and for blue photons at the TiO2 band-edge where significant room exists for improvement of photocatalytic quantum yields. Under AM 1.5 one sun illumination, multilayer nanotube arrays afforded us an approximately 20% improvement in photocurrent over single layer nanotube array films of the same thickness for N-719 sensitized liquid junction solar cells. Also, the possibility of multipodal TiO2 nanotube growth with different electrolyte recipes is presented. © 2013 Materials Research Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); National Institute for Nanotechnology (NINT-INNT)
Peer reviewedYes
NPARC number21270907
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Record identifier1c1d287a-20a1-4177-bebf-5f2bf2cf3b65
Record created2014-02-18
Record modified2016-05-09
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