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Vertically aligned TiO2/ZnO nanotube arrays prepared by atomic layer deposition for photovoltaic applications
- Source :
- Korean Journal of Chemical Engineering. 36:1157-1163
- Publication Year :
- 2019
- Publisher :
- Springer Science and Business Media LLC, 2019.
-
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 VOC and electron lifetime.
- Subjects :
- Photocurrent
Nanotube
Mesoscopic physics
Materials science
business.industry
General Chemical Engineering
Shell (structure)
02 engineering and technology
General Chemistry
021001 nanoscience & nanotechnology
Spectral line
Atomic layer deposition
020401 chemical engineering
Electrode
Optoelectronics
0204 chemical engineering
0210 nano-technology
business
Deposition (law)
Subjects
Details
- ISSN :
- 19757220 and 02561115
- Volume :
- 36
- Database :
- OpenAIRE
- Journal :
- Korean Journal of Chemical Engineering
- Accession number :
- edsair.doi...........6da72223f27019b0023910b00c2fe631