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

Jimmy Yao, Chih Min Lin, Stuart Yin

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    3 Scopus citations

    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.

    Original languageEnglish (US)
    Title of host publicationPhysics, Simulation, and Photonic Engineering of Photovoltaic Devices IV
    EditorsAlexandre Freundlich, Jean-Francois Guillemoles, Masakazu Sugiyama
    PublisherSPIE
    ISBN (Electronic)9781628414486
    DOIs
    StatePublished - Jan 1 2015
    EventPhysics, Simulation, and Photonic Engineering of Photovoltaic Devices IV - San Francisco, United States
    Duration: Feb 10 2015Feb 12 2015

    Publication series

    NameProceedings of SPIE - The International Society for Optical Engineering
    Volume9358
    ISSN (Print)0277-786X
    ISSN (Electronic)1996-756X

    Other

    OtherPhysics, Simulation, and Photonic Engineering of Photovoltaic Devices IV
    CountryUnited States
    CitySan Francisco
    Period2/10/152/12/15

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Computer Science Applications
    • Applied Mathematics
    • Electrical and Electronic Engineering

    Fingerprint Dive into the research topics of 'Density-controlled ZnO/TiO<sub>2</sub> nanocomposite photoanode for improving dye-sensitized solar cells performance'. Together they form a unique fingerprint.

  • Cite this

    Yao, J., Lin, C. M., & Yin, S. (2015). Density-controlled ZnO/TiO2 nanocomposite photoanode for improving dye-sensitized solar cells performance. In A. Freundlich, J-F. Guillemoles, & M. Sugiyama (Eds.), Physics, Simulation, and Photonic Engineering of Photovoltaic Devices IV [935819] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9358). SPIE. https://doi.org/10.1117/12.2085268