含二維側鏈之5,6-雙氟-2,1,3-苯并噻二唑與噻吩之共軛高分子及矽雜環戊二烯并二硒吩之共軛高分子之合成與鑑定

Abstract

本研究分別設計出兩系列的共軛高分子並應用於有機薄膜電晶體及有機太陽能電池上。在第一部分中，以PTh4FBT為高分子主鏈，在側鏈導入不同平面性的分子perylene及dithienylbenzothiadiazole (DTBT)進行共聚，成功合成出不同的共軛高分子 PTh4FBT-PERY 及PTh4FBT-DTBT研究其光電性質和結構分析並應用於OFET及OPV，得到電荷遷移率分別為4.04 × 10-1 cm2 V-1 s-1及1.08 × 10-1 cm2 V-1 s-1，其中PTh4FBT-PERY的電荷遷移率有比PTh4FBT(2.89 × 10-1 cm2 V-1 s-1)更佳的元件表現，在OPV方面，PTh4FBT-PERY及PTh4FBT-DTBT的光電轉換效率分別為5%及4.97%。

第二部分的研究，我們將silolo[3,2-b:4,5-b']bis(selenophene)(DSS)為主的電子施體(donor)與不同碳鏈的電子受體(acceptor) dithienodiketopyrrolopyrrole (DPP)做共聚，得到共軛高分子PDSSDPP-C2C6及PDSSDPP-C8，之後將這兩個共軛高分子與silolo[3,2-b:4,5-b']dithiophene與DPP共聚而得的高分子PDTSDPP-C8進行硒吩與噻吩對於共軛高分子的光電性質影響。PDSSDPP-C2C6 、PDSSDPP-C8電荷遷移率分別為2.67 × 10-2 cm2 V-1 s-1、2.47 × 10-2 cm2 V-1 s-1。兩者的元件表現皆比PDTSDPP-C8(3.89 × 10-3 cm2 V-1 s-1)有更高的電荷遷移率。

In this study, two series of conjugated polymers were synthesized for the application of organic thin film transistors (OTETs) and organic solar cells (OSCs). For the first series, perylene and dithienylbenzothiadiazole (DTBT) were introduced to the side chain of poly(5,6-difluoro-benzo-2,1,3-thiadiazole co-quaterthiophene) (PTh4FBT) to obtain two types of copolymers, i.e. PTh4FBT-PERY, PTh4FBT-DTBT. The obtained polymers were characterized by UV, CV, DSC, TGA, X-ray diffraction and their performance in OTFTs and OSCs. Both PTh4FBT-PERY and PTh4FBT-DTBT show the mobilities of 4.04 × 10-1 cm2 V-1 s-1 and 1.08 × 10-1 cm2 V-1 s-1 respectively. The mobility of PTh4FBT-PERY is higher than that (2.89 × 10-1 cm2 V-1 s-1) of PTh4FBT. The PCE values of PTh4FBT-PERY and PTh4FBT-DTBT based OPV devices are 5.0% and 4.97% respectively. For the second series, silolo[3,2-b:4,5-b']bis(selenophene)(DSS) were used as an electron donor unit and it was copolymerized with dithienodiketopyrrolopyrrole (DPP) containing octyl and 2-ethylhexyl side chains to obtain two alternating copolymers, i.e. PDSSDPP-C2C6 and PDSSDPP-C8. The obtained polymers were characterized by UV, CV, DSC, TGA, X-ray diffraction and their OTFTs performance. Both PDSSDPP-C2C6 and PDSSDPP-C8 show the mobilities of 2.67 × 10-2 cm2 V-1 s-1 and 2.47 × 10-2 cm2 V-1 s-1 respectively.Both values are higher than that (3.89 × 10-3 cm2 V-1 s-1) of homologue PDTSDPP-C8.