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http://dx.doi.org/10.5012/bkcs.2012.33.7.2200

One-Dimensional Core/Shell Structured TiO2/ZnO Heterojunction for Improved Photoelectrochemical Performance  

Ji, In-Ae (Department of Chemistry and Applied Chemistry, Hanyang University)
Park, Min-Joon (Department of Chemical Engineering, Hanyang University)
Jung, Jin-Young (Department of Chemical Engineering, Hanyang University)
Choi, Mi-Jin (Department of Chemistry and Applied Chemistry, Hanyang University)
Lee, Yong-Woo (Department of Chemistry and Applied Chemistry, Hanyang University)
Lee, Jung-Ho (Department of Chemical Engineering, Hanyang University)
Bang, Jin-Ho (Department of Chemistry and Applied Chemistry, Hanyang University)
Publication Information
Abstract
One-dimensional $TiO_2$ array grown on optically transparent electrode holds a promise as a photoelectrode for photoelectrochemical water splitting; however, its crystal structure is rutile, imposing constraints on the potent use of this nanostructure. To address this issue, a heterojunction with type-II band alignment was fabricated using atomic layer deposition (ALD) technique. One-dimensional core/shell structured $TiO_2$/ZnO heterojunction was superior to $TiO_2$ in the photoelectrochemical water splitting because of better charge separation and more favorable Fermi level. The heterojunction also possesses better light scattering property, which turned out to be beneficial even for improving the photoelectrochemical performance of semiconductor-sensitized solar cell.
Keywords
$TiO_2$/ZnO heterojunction; Photoelectrochemical water splitting; Atomic layer deposition; Semiconductor-sensitized solar cell;
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