以咔唑及噻吩熔合之七環化合物所形成之共軛高分子之合成及其在有機場效電晶體之應用

Abstract

本研究主要重點在合成dithienocyclopenta-carbazole（DTCC）七環小分子以及使用DTCC作為單體的共軛高分子，並將合成的共軛高分子製作成有機薄膜電晶體元件並量測它們在空氣下的載子遷移率。 隨後我們將七環小分子DTCC與thiophene(1T)、2,5-bis(2-ethylhexyl)-3,6-di(thiophen-2-yl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione(DPP)、2-(thiophen-2-yl)thiophene(2T)、2,5-di(thiophen-2-yl)thiophene(3T)、 benzodithiophene(BDT)、benzo[c][1,2,5]thiadiazole(BT)以及 thieno[3,2-b]thiophene(TT)進行聚合反應得到七個高分子PDTCC1T、PDTCCDPP、PDTCC2T、PDTCC3T、PDTCCBDT、PDTCCBT以及PDTCCTT。 在這七個共軛高分子中，PDTCCDPP 和 PDTCC3T在電晶體的表現最好。PDTCCDPP載子遷移率為1.98×10-2 cm2 V-1 s-1，開關比約為 104，起始電壓為 1.8 V。PDTCC3T載子遷移率為1.36×10-2 cm2 V-1 s-1，開關比約為104，起始電壓為 −4.6 V。

In this study, we focused on the synthesis of ladder-type conjugated polymers based on dithienocyclopenta-carbazole(DTCC)heptacyclic unit, and their corresponding polymers. The obtained polymers were fabricated to form the OFET devices to mesure their carrier transport in the ambient condition. The obtained heptacyclic monomer DTCC were copolymerized with 2,5-bis(2-ethylhexyl)-3,6-di(thiophen-2-yl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione(DPP), 2-(thiophen-2-yl)thiophene(2T), 2,5-di(thiophen-2-yl)thiophene(3T), benzodithiophene(BDT), benzo[c][1,2,5]thiadiazole(BT), thiophene(1T), and thieno[3,2-b]thiophene(TT) units to form seven kinds of polymers PDTCCDPP, PDTCC2T, PDTCC3T, PDTCCBDT, PDTCCBT, PDTCC1T, and PDTCCTT. Among seven kinds of polymers, both PDTCCDPP and PDTCC3T show better performances. The TFT device of PDTCCDPP shows the mobility of 1.98×10-2 cm2 V-1 s-1, on-off ratio is about 104, and threshold voltage is 1.8 V. And The TFT device of PDTCC3T shows the mobility of 1.36×10-2 cm2 V-1 s-1, on-off ratio is approximately104, and threshold voltage is −4.6 V.