| Summary: | 碩士 === 吳鳳技術學院 === 光機電暨材料研究所 === 95 === CuInSe2 is one of the most promising absorber materials for thin film solar cells. Furthermore, CuInSe2-based solar cells have shown long-term stability and the highest conversion efficiencies of all thin film solar cells, above 18 %. According to some reported papers, we believe it is a potential to combine electrodeposition CuInSe2 and ZnO for establishing a new route for CIS thin film solar cells development.
In this study, two different electrodeposition methods (constant-potential and constant-current) have been applied to investigate the formation mechanism of the ZnO / CuInSe2 on indium tin oxide (ITO). The crystallinity , surface morphology, composition and transmittance of the co-deposition ZnO / CuInSe2 on ITO substrate were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), electron probe X-ray microanalyzer (EPMA), Energy Dispersive Spectrometer (EDS), and UV-Visible Spectrometer.
Based on the experimental results, The dense ZnO films has been deposited onto n-type CuInSe2 from an aqueous solutions containing 1×10－3M ZnCl2 , 0.1 M KCl and 10×10－3 M H2O2 adjusted to pH=5. The as-deposited ZnO films had wurtzite structure with exhibited optical bandgap energy of 3.3 eV. XRD shows a preferential orientation (002) that increases strong depend on deposition time and pH value. Additionally, SEM micrographs show the ZnO electrodeposits consisted of columnar grains, which grew with c axis perpendicular to the substrate. Furthermore, Experimental results indicate that smaller grains, uniformity and higher transmittance of ZnO films from electrodeposition under constant-potential. At least we found that add complexing agent triethanolamine (TEA) will significant enhance ZnO / CuInSe2 adhesion.
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