| Summary: | 博士 === 國立交通大學 === 應用化學系碩博士班 === 99 === In this thesis, we the preparation of TiO2 pastes and photovoltaic measurement of DSSC devices. We tried to understand how the quality of the TiO2 pastes and the composites of the device affecting the device performance. The investigations were collaborated with Prof. Chen-Yu Yeh (NCHU). Novel porphyrin meso- or β- substituted porphyrins with a carboxyl group have been tested as sensitizers for DSSC. The results suggested that the photovoltaic properties of the DSSC can be affected by either the position of a bridge connecting the porphyrin ring and the number of carboxylic acid group. Because YD1 device showed the prominent performance the other porphyrin molecules were designed based on the structure of YD1. We investigated the effect of electron-donating group attached on a meso-position. The results show that the porphyrin with as alkyl-substituted diaryamino group (YD2), has higher stability and superior device performance. Then, we studied porphyrins with different types of bridges (YD11-13) for porphyrin-sensitized solar cell. The IPCE spectrum of YD12 has a Q-band shoulder slightly extended to longer wavelengths, resulting in a greater Jsc and higher power efficiency for YD12 than for YD11. In the last part, we studied the influence of electrolyte additives 4-t-butylpyridine (TBP) for porphyrin sensitized solar cell. We measured the device performance of YD12 and YD12CN with electrolytes containing different ratios of TBP. The additive TBP showed a significant influence on promoting the Voc of device. However, the effects of TBP additive on the device performance are different for YD12 and YD12CN. Electron-injection and charge-collection kinetics were reported to discuss the observed discrepancy.
|
|---|
