화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.36, No.7, 1157-1163, July, 2019
DOI10.1007/s11814-019-0280-4  Export Citation
Vertically aligned TiO2/ZnO nanotube arrays prepared by atomic layer deposition for photovoltaic applications
Jae-Yup Kim†, Keun-Young Shin1, Muhammad Hamid Raza2, Nicola Pinna2, and Yung-Eun Sung3, †
  • Department of Chemical Engineering, Dankook University, Yongin 16890, Korea
  • 1Department of Materials Science and Engineering, Hallym University, Chuncheon 24252, Korea
  • 2Institut für Chemie and IRIS Adlershof, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, Berlin 12489, Germany
  • 3Center for Nanoparticle Research, Institute for Basic Science (IBS) and School of Chemical and Biological Engineering, Seoul National University, Seoul 08826, Korea
E-mail:,
Vertically aligned TiO2/ZnO nanotube (NT) arrays were developed for application to photoanodes in mesoscopic solar cells. By a two-step anodic oxidation, vertically aligned TiO2 NT arrays with highly ordered surface structure were prepared, followed by deposition of a ZnO shell with a precisely controlled thickness using atomic layer deposition (ALD). When applied to a photoanode of dye-sensitized solar cells (DSSCs), the photovoltage is gradually enhanced as the ZnO shell thickness of the TiO2/ZnO NT electrodes is increased. Furtheremore, the electron lifetime in photoanodes is significantly enhanced due to the ZnO shell, which is examined by open-circuit voltage decay (OCVD) measurement. Photocurrent density-voltage (J-V) curves under the dark condition and OCVD spectra reveal that a negative shift in TiO2 conduction band potential and an energy barrier effect owing to the ZnO shell concurrently contribute to the enhancement of VOC and electron lifetime.
Keywords:TiO2/ZnO Nanotube;Anodic Oxidation;Dye-sensitized Solar Cells;Atomic Layer Deposition
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