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HL: Fachverband Halbleiterphysik
HL 30: Photovoltaics: Nanostructured materials
HL 30.4: Vortrag
Dienstag, 17. März 2015, 11:00–11:15, ER 164
Enhanced photoelectrochemical activity of vertically aligned ZnO-coated TiO2 nanotubes — •Hua Cai1,2, Qin Yang2, Zhigao Hu3, Zhihua Duan3, Qinghu You2, Jian Sun2, and Jiada Wu2 — 1Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2Fudan University, Shanghai, China — 3East China Normal University, Shanghai, China
Vertically aligned ZnO-TiO2 hetero-nanostructures constructed of anatase TiO2 nanotubes (NTs) and wurtzite ZnO coatings are fabricated by atomic layer deposition of ZnO coatings on electrochemical anodization formed TiO2 NTs, and their photoelectrochemical activities are studied through photoelectrochemical and electrochemical characterization. Compared with bare TiO2 NTs, the transient photocurrent increases to over 1.5-fold for the annealed ZnO-coated TiO2 NTs under visible illumination. The ZnO-coated TiO2 NTs also show a longer electron lifetime, a lower charge-transfer resistance and a more negative flat-band potential than the bare TiO2 NTs, confirming the improved photoelectrochemical activity due to the enhanced charge separation.