Density-controlled ZnO/TiO2 nanocomposite photoanode for improving dye-sensitized solar cells performance

Jimmy Yao; Chih-Min Lin; Stuart (Shizhuo) Yin

doi:10.1117/12.2085268

16 March 2015 Density-controlled ZnO/TiO₂ nanocomposite photoanode for improving dye-sensitized solar cells performance

Jimmy Yao, Chih-Min Lin, Stuart (Shizhuo) Yin

Proceedings Volume 9358, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices IV; 935819 (2015) https://doi.org/10.1117/12.2085268
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

Dye-sensitized solar cells (DSSCs) via ZnO/TiO₂ nanocomposite photoanode with density-controlled abilities are presented in this paper. This nanocomposite photoanode is composed of TiO2 nanoparticles dispersed into densitycontrolled vertically aligned ZnO-TiO₂ core-shell nanorod arrays. The density-controlled ZnO-TiO₂ core-shell nanorod arrays were synthesized directly onto fluorine-doped tin oxide (FTO) substrates using an innovative two-step wet chemical route. First, the density-controlled ZnO nanorod arrays were formed by applying a ZnO hydrothermal process from a TiO₂ nanocrystals template. Second, the ZnO-TiO₂ core-shell nanorod arrays were formed by depositing a TiO₂ shell layer from a sol-gel process. The major advantages of a density-controlled ZnO/TiO₂ nanocomposite photoanode include (1) providing a better diffusion path from ZnO nanorod arrays and (2) reducing the recombination loss by introducing an energy barrier layer TiO₂ conformal shell coating. To validate the advantages of a density-controlled ZnO/TiO₂ nanocomposite photoanode, DSSCs based on a ZnO/TiO₂ nanocomposite photoanode were fabricated, in which N719 dye was used. The average dimensions of the ZnO nanorod arrays were 20 μm and 650 nm for the length and the diameter, respectively, while the designated spacing between each nanorod was around 5 μm. The performance of the solar cell was tested by using a standard AM 1.5 solar simulator from Newport Corporation. The experimental results confirmed that an open-circuit voltage, 0.93 V, was achieved, which was much higher than the conventional TiO₂ nanoparticles thin film structure for the same thickness. Thus, density-controlled ZnO/TiO₂ nanocomposite photoanodes could improve the performance of DSSCs by offering a better electron diffusion path.

Citation Download Citation

Jimmy Yao, Chih-Min Lin, and Stuart (Shizhuo) Yin "Density-controlled ZnO/TiO₂ nanocomposite photoanode for improving dye-sensitized solar cells performance", Proc. SPIE 9358, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices IV, 935819 (16 March 2015); https://doi.org/10.1117/12.2085268

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