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Dye-Sensitized Solar Cells Using Aluminum-Doped Zinc Oxide/Titanium Dioxide Photoanodes in Parallel

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Graduate School of Electronic Engineering, National Yunlin University of Science and Technology, Douliu 64002, Taiwan
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Graduate School of Chemical and Materials Engineering, National Yunlin University of Science and Technology, Douliu 64002, Taiwan
*
Author to whom correspondence should be addressed.
Energies 2019, 12(18), 3469; https://doi.org/10.3390/en12183469
Received: 23 July 2019 / Revised: 3 September 2019 / Accepted: 5 September 2019 / Published: 9 September 2019
(This article belongs to the Special Issue Advanced Dye-Sensitized Solar Cells)
In this study, both zinc oxide (ZnO) nanorods and aluminum-doped zinc oxide (AZO) nanosheets were deposited by hydrothermal growth on fluorine-doped tin oxide (FTO) glass. After a photoanode was added to ZnO nanorods or AZO nanosheets, the photovoltaic conversion efficiency (PCE) increased due to improved electron transport and enhanced dye absorption. The improvement in electron transport was verified by electrochemical impedance spectroscopy (EIS), and the increase in dye absorption was verified by ultraviolet-visible spectroscopy. Both of these factors facilitated an increase in PCE. Parameters for dye-sensitized solar cells (DSSCs) using ZnO nanorods/TiO2 and AZO nanosheets/TiO2 photoanodes were tested and the results were recorded using EIS. The results indicated that the addition of the ZnO nanorods increased the short-circuit current density (Jsc) from 9.07 mA/cm2 to 10.91 mA/cm2, the open circuit voltage (Voc) from 0.68 V to 0.70 V, and the PCE from 3.70% to 4.73%, respectively. When the DSSCs were produced in a parallel silver-grid device, the results showed that PCE could be increased from 3.67% to 4.04% due to the reduction in connection resistance. View Full-Text
Keywords: dye-sensitized solar cells (DSSCs); aluminum-doped zinc oxide (AZO); titanium dioxide (TiO2); parallel connection dye-sensitized solar cells (DSSCs); aluminum-doped zinc oxide (AZO); titanium dioxide (TiO2); parallel connection
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Chou, J.-C.; Ko, C.-C.; Chang, J.-X.; Lai, C.-H.; Nien, Y.-H.; Kuo, P.-Y.; Chen, H.-H.; Hsu, H.-H.; Hu, G.-M. Dye-Sensitized Solar Cells Using Aluminum-Doped Zinc Oxide/Titanium Dioxide Photoanodes in Parallel. Energies 2019, 12, 3469.

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