| 摘要: | 有機光伏電池 (Organic Photovoltaics, OPVs) 因具有低成本、可大面積製作及可撓曲性等特點，成為綠色能源研究的重點之一。許多科學家致力於改良主動層分子的結構，來提高 OPVs 的光電轉換效率。本論文以三併環?吩dithieno[2,3-b:3’,2’-d]thiophene (DTT) 稠環單元為中心片段，4-(5-(2-ethylhexyl)thiophen-2-yl)-7-(thiophen-2-yl)
benzo[c][1,2,5]thiadiazole (BT-EH)為末端手臂，合成出小分子半導體S3，結構簡寫為EH-BT-(DTT-Th)-BT-EH，其最大吸收波長為518 nm，莫耳吸收係數為73400 M-1cm-1。此外，在合成過程中還得到一些合成中間體的偶合物 Dimer-BT-EH 及 Dimer-BT-TPA。 Dimer-BT-EH 的最大吸收波長為 527 nm，Dimer-BT-TPA的最大吸收波長為 563 nm 。 以S3、Dimer-BT-EH及Dimer-BT-TPA為p型材料，搭配PC71BM做為主動層，且由溶液製程所組裝的有機太陽能電池光電轉換效率分別為0.21 %、0.28 %、0.67 %。
Organic photovoltaic (OPV) is a hot research topic of the green energy due to its low-cost, large area processing and flexibility. Many scientists put efforts in preparing new active components molecular character of active layer, to improve the photoelectric conversion efficiency (PCE) of OPVs. In this thesis, we synthesized an organic small molecule semiconductor S3 for using as a p-type semiconductor for OPV. S3 comprises a dithieno [2,3-b:3',2'-d] thiophene (DTT), a fused-ring molecule, as the core unit, 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 maximum and molar absorption coefficient of S3 is 518 nm and 73400 M-1cm-1, respectively. Durning the synthesis of S3, two byproducts Dimer-BT-EH and Dimer-BT-TPA were also isolated. Dimer-BT-EH and Dimer-BT-TPA have the absorption maximum at 527 nm and 563 nm, respectively. The bulk heterojunction (BHJ) organic photovoltaic devices (OPVs) based on these three organic p-type semiconductor were fabricated via solution process. When PC71BM were used as a n-type acceptor, PCE of the devices based on S3, Dimer-BT-EH and Dimer-BT-TPA 0.21 %, 0.28 %, and 0.67 %, respectively. |
