| Summary: | 碩士 === 國立臺北科技大學 === 有機高分子研究所 === 95 === Knowing that oil and coal are exhausted, nuclear energy is not popular, and green house effect and broken ozone layer are aggravated by the emission of CO2, developed countries are actively developing clean and safe new energy. Solar energy is the one that arouses people’s interests and countries are offering incentives to promote it. Some predict that it will exceed the generation of nuclear power by the middle of next century. As a result, solar energy will play an important role in future energy industry. At the beginning of 1990’s, M. Grätzel et al., using the high-surface-area titania, developed a new type of solar cell to absorb the sunshine from the angle of incidence of visible light wavelength. The efficiency of such solar cell could reach 10-12%, as high as that of non-crystalline silocone solar cell. Moreover, porous nano semiconductor membrane is a key to the manufacture of die-sensitized solar cells. Therefore, the researcher used titanium isopropoxide as the starter to try to synthesize porous nano titania with sol-gel and hydrothermal methods. The manufactured porous nano titania was inspected with XRD, TEM and BET to analyze its property.
The results revealed that, with the catalyst for hydrolysis from 8.0 M acetic acid and the gel from two-stage heating mixture (8 hours under 80℃ and 2 hours under 200℃) in high temperature and pressure caldron, plus the calcinations under 150℃, the portion of titania porous membrane electrode and titanium coal arrived at 100%, surface was 227m2/g and crystallinity was 88%, particle diameter was 7.2 nm and the pore fell between 5 and 8 nm. The porous titania membrane cell was cleaned with UV ray method and then soaked in N719 for 18 hours in room temperature. It was then obtained a high die amount of 8.0×10-7mole/cm2. The component (acetonitrile with electrolyte as 0.5M LiI/0.05M I2), under the illumination of 100mW/cm2, had the optronics transformation efficiency of 4.2% and 5.4%.
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