| Summary: | 碩士 === 國立交通大學 === 應用化學研究所 === 98 === In this study we investigate the effect of phosphorous doping in TiO2 on water-splitting and DSSC efficiencies. We take advantage of SEM, XPS, XRD and EPMA analyses to characterize the P-doped TiO2 nanotubes. We found that phosphorous ion (P5+) could partially replace of titanium ion (Ti4+), resulting in charge imbalance which can decrease the electron-hole recombination. In the experiment of water-splitting, we can clearly see that the efficiency of P-doped TiO2 nanotubes is higher than the undoped ones, because the P-doped sample has shown a red-shift in the UV-Vis absorption spectrum. The absorption in the long-wavelength results in the increase in the efficiency of water-splitting. We also tested the effects of treatment on the doped TiO2 nanotubes with TiCl4 and varying the concentration of H3PO4 in the anodization electrolyte, the former treatment led to enhanced DSSC efficiencies, whereas the latter test showed that a higher H3PO4 concentration gave rise to shortened nanotubes with observable cracks and lower DSSC efficiencies. We also deposited InN semiconductor on P-doped TiO2 nanotubes by plasma enhanced chemical vapor deposition; we could see clearly the enhanced absorption wavelength range and absorption intensity, resulting in an enhancement in photoconversion by 11%.
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