Effects of TiO2 Photoelectrode and Polyaniline on the Photovoltaic Properties of Solid State Dye-Sensitized Solar Cell

• Main Authors: Chia-Hao Hus, 許家豪
• Other Authors: Ko-Shan Ho
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/02030967615752519681

碩士 === 國立高雄應用科技大學 === 化學工程系碩士班 === 96 === The solid-state TiO2/Dye/PANI solar cells were fabricated by the sandwich assemble technique, where the porous nano-TiO2, commercial N3 derivative and synthesized tube-like PANI act as photoelectrode, electron donor and hole transport layer (HTL), respectively. Effects of pH value of sol-gel reaction and annealing conditions on the particle size, surface area and crystallization of TiO2 as well as the photovoltaic characteristics and photo-to-electron conversion efficiency () of the solid-state TiO2/Dye/PANI solar cell were studied. The influence of PANI morphology and its conductivity was also discussed. I-V characteristics curve measurements showed that the of solid-state TiO2/Dye/PANI solar cell is strongly related to the preparing pH value, annealing conditions and film thickness of annealed TiO2. The significantly decreased with increasing the annealing temperature and annealing time due to the increase in the micropore volume of annealed TiO2. The highest  (ca. 0.00916 %) of solid-state TiO2/Dye/PANI solar cell can be obtained when the pH was 7.0,TiO2 annealed at 450℃for 30 min and the thickness of annealed TiO2 was 2.014 μm. When (Zn(DBS)2) was added into PANI, the PANI molecule chain became apparently aggregation and exhibited a blue shift phenomenon, as compared with the free-(Zn(DBS)2) PANI system, the hole mobility in PANI significantly decreased from 1.356 to 0.3060 cm2/Vs, leading to the decrease in . In spite of that the Isc value of HTL increased gradually with increasing the illumination time, the is lower than that of PANI system free of (Zn(DBS)2). As for I-V characteristics measurements, values of Voc and Isc of solid-state TiO2/Dye/PANI-LICl solar cell are apparently improved due to the decrease in HOMO and reduced resistance and transition distance of electrons in the conductive band. At 0.5M LiCl, the of TiO2/Dye/ PANI-LICl solar cell was about 0.2468 %.