Self-assembled SiO2 particle coating on 2 layer anti-reflection films for efficiency enhancement of GaAs PV cells

Kentaroh Watanabe, Akio Higo, Masakazu Sugiyama, Yoshiaki Nakano

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

    4 Citations (Scopus)


    An anti-reflection coating (ARC) with sub-micrometer size of structure has brought significant advantage in solar cell efficiency. Owing to the diffraction and light trapping effect caused by a sub-wavelength size of structure, the reduced reflectance covering a wide-wavelength can be expected at a surface of the photovoltaic (PV) cell. We proposed and tried a nano-scale structure fabrication by small-size particles combined with conventional 2 layers ARC on GaAs PV cells. The small-size spherical particles show well aligned self-assembly on the substrate when the solution containing micro-spheres were dried with a proper sheer force. Using the pure water solution of colloidal SiO2 spheres and an ordinal spin-coating technique, a well aligned mono-particle layer has been fabricated on the 2 layer ARC (TiO2 and SiO 2) on a GaAs PV cell. In this research, we tried 3 samples with different size of particles (400 nm, 200 nm and 100 nm in diameter). As the evaluation of PV cell, I-V characteristics under the AM1.5G illumination and external quantum efficiency (EQE) spectra were measured. For each sample, the I-V and EQE were obtained from the same sample: before and after application of particle coating. Measured relative efficiency enhancement of the additional mono-layer coating was +7.1, +5.7 and -0.3 in % for particle sizes of 100, 200 and 400 nm, respectively. As well as enhancement in light incorporation to the inside of a PV cell, there seem to be scattering loss by the particles on the cell. In the range of tested particle size, the smaller particle was preferable to avoid scattering loss and provides a larger efficiency enhancement to GaAs PV cells.

    Original languageEnglish
    Title of host publicationProgram - 35th IEEE Photovoltaic Specialists Conference, PVSC 2010
    Number of pages4
    Publication statusPublished - 2010 Dec 20
    Event35th IEEE Photovoltaic Specialists Conference, PVSC 2010 - Honolulu, HI, United States
    Duration: 2010 Jun 202010 Jun 25

    Publication series

    NameConference Record of the IEEE Photovoltaic Specialists Conference
    ISSN (Print)0160-8371


    Other35th IEEE Photovoltaic Specialists Conference, PVSC 2010
    Country/TerritoryUnited States
    CityHonolulu, HI

    ASJC Scopus subject areas

    • Control and Systems Engineering
    • Industrial and Manufacturing Engineering
    • Electrical and Electronic Engineering


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