Vertically aligned TiO2/ZnO nanotube arrays prepared by atomic layer deposition for photovoltaic applications
- Authors
- Kim, Jae-Yup; Shin, Keun-Young; Raza, Muhammad Hamid; Pinna, Nicola; Sung, Yung-Eun
- Issue Date
- Jul-2019
- Publisher
- KOREAN INSTITUTE CHEMICAL ENGINEERS
- Keywords
- TiO2; ZnO Nanotube; Anodic Oxidation; Dye-sensitized Solar Cells; Atomic Layer Deposition
- Citation
- KOREAN JOURNAL OF CHEMICAL ENGINEERING, v.36, no.7, pp.1157 - 1163
- Journal Title
- KOREAN JOURNAL OF CHEMICAL ENGINEERING
- Volume
- 36
- Number
- 7
- Start Page
- 1157
- End Page
- 1163
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/39962
- DOI
- 10.1007/s11814-019-0280-4
- ISSN
- 0256-1115
- Abstract
- 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 V-OC and electron lifetime.
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