| Summary: | 碩士 === 國立中央大學 === 化學學系 === 102 === The dwindling of the fossil fuel reserves, searching for other cost-effective alternative energy has become an urgent work. Organic photovoltaics (OPVs) is one of hot research topics of the green energy due to their eminent advantages such as low cost, colorful, flexibility and solution-processable. Many scientists put their efforts in designing new material of active layer, especial p-type conjugated moecules, to increase the photovoltaic conversion efficiency (PCE) of OPVs. In this thesis, we designed and synthesized two new organic small molecule semiconductor S5 and S6 for applying as a p-type semiconductors in OPVs. These two molecules comprise a quinoxaline or a fused-ring, as the core unit, 3-hexylthiophene as a conjugate moiety and BT-EH (4-(5-(2-ethylhexyl) thiophen-2-yl)-7-(thiophen-2-yl)benzo[c][1,2,5] thiadiazole) as arms attached on each side. The absorption spectra (in dichloromethane) of both S5 and S6 have the an absorption maximum at 540 nm and molar absorption coefficient of 51600 M-1cm-1 and 54900 M-1cm-1, respectively. The bulk heterojunction (BHJ) organic photovoltaic devices based on these two organic p-type semiconductor were fabricated via solution process. When PC71BM were used as a n-type material, PCE of the devices based on S5 and S6 are 0.51% and 0.31%, respectively.
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