| Summary: | 碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系 === 99 === Various morphologies polyaniline (PANI) deposited on the interface betweenTiO2 and Dye (TiO2-Dye/PANI) and ITO counter electrode (PANI-ITO C.E.) were prepared by photo-chemical and electrochemical polymerization method, respectively, where deposited PANI used as the electro hole transport layer material (HTM) in the part of solid state dye-sensitized solar cell (DSSC). The solid state TiO2-Dye/PANI/ITO and TiO2/Dye/PANI-ITO solar cells were further fabricated by using sandwich assembling technique. As a result, in spite of the photo-chemical polymerization method can effectively improve the electric contact between TiO2 and PANI, leading to increase in current density, but the PANI chains may penetrate into the TiO2-Dye layer and growth on the surface of ITO, results in the total photoelectric conversion efficiency () is apparently depressed. As the total charge is 0.3 coulomb, the deposited PANI exhibits the best surface roughness, conjugated degree and electrochemical activity than those of applied coulombs. When 4-tert-Butylpyridine (TBP) added into HTM, the electron-hole recombination between TiO2 and HTM is significantly reduced; the Voc hence increases to 0.52 V. As TBP and LiI added into HTM, LiI acts as the dopant of PANI and the redox couple in the solar cell, leading to the improvement of photovoltaic characteristics. At 0.7M TBP and 0.1 M LiI, the η of TiO2/Dye/PANI-ITO solar cells is 0.643 %.
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