| Summary: | 碩士 === 國立成功大學 === 化學系 === 102 === In our experiments, CAS and CIAS were deposited on ITO glass from chloride electrolytes by the method of co-electrodeposition. The parameters include: individual ion concentration, annealing temperature and annealing time, TEA concentration, deposition potential and deposition time. Among all conditions, the optimum condition was 5 mM CuCl2 + 30 mM AlCl3 + 22 mM SeO2 + 0.2 M TEA deposited at pH 2.50 and then under annealing at 300 °C for 1.0 hr.
Current density, particle size, thickness and band gap were found to be affected by the deposition potential. The crystal structure, compositions and morphologies of the deposited thin films were determined by X-ray powder diffractometer, energy dispersive spectrometer and scanning electron microscope, respectively. X-ray diffraction patterns revealed the peak intensities of the deposits were altered when the parameters mentioned above changed. From the analysis of EDS, the atomic ratios of Se in the films of deposits were discovered lower than the stoichiometric ratio. This phenomenon would narrow down the band gap, which can be calculated from formulas.
To investigate the optical properties, transmittance and reflectance of the films could be examined by UV-VIS-NIR-Spectrophotometer, and it would cause different absorption coefficients which were calculated from formulas. Overall, the absorption coefficient of the deposited films was as high as 104 cm-1, demonstrates that the films are potential absorbing materials because it possesses strong sunlight-absorbing characteristics.
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