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Author: search.filters.author.Chaisitsak, S.Subject: search.filters.subject.CuInS2

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    Spray deposited CuInS2/TiO2 thin film solar cells
    (2013-09-02)
    Kaliang, J.
    ;
    Chaisitsak, S.
    Copper indium sulfide (CIS) solar cells with Ag/CIS/TiO<inf>2</inf>/FTO/ glass structure were fabricated by non-vacuum methods. The nanoporous TiO <inf>2</inf> and nanocrystalline CIS films were prepared by screen-printing and spray pyrolysis techniques, respectively. The obtained films were examined using field-emission scanning electron microscopy and X-ray diffraction. The solar cell properties were characterized under AM 1.5. The porous nature of TiO <inf>2</inf> layer was found to cause the formation of nanocrystalline CIS with a very small grain size within the TiO<inf>2</inf> matrix. The photocurrent could not be observed in any devices without a TiO<inf>2</inf> layer (i.e. CIS/FTO), while it was detected for the devices consisting of TiO<inf>2</inf> layer (i.e. CIS/TiO<inf>2</inf>/FTO). The thickness of TiO<inf>2</inf> layer was optimized for maximum efficiency. The highest efficiency obtained solar cells was 2.3 × 10<sup>-5</sup> % (V<inf>oc</inf>: 0.147 V, J<inf>sc</inf>: 6.5×10<sup>-7</sup>A/cm<sup>2</sup>, FF: 0.24) with a 3-μm-thick TiO<inf>2</inf>. © 2013 IEEE.