Dithieno-naphthalimide based copolymers for air-stable field effect transistors: synthesis, characterization and device performance
作者:Gaole Dai、Jingjing Chang、Jishan Wu、Chunyan Chi
DOI:10.1039/c2jm34251k
日期:——
A new thiophene-fused naphthalimide building block, 9-(2-decyltetradecyl)-8H-dithieno-[3′,2′:3,4; 2′′,3′′:5,6]benzo[1,2-f]isoindole-8,10(9H)-dione (4), was synthesized and three novel conjugated copolymers P1–P3 based on this building block and electron-rich units such as 4,4′-didodecyl-2,2′-bithiophene (for P1), benzo[1,2-b:4,5-b′]dithiophene (for P2) and 3,6-didodecylthieno[3,2-b]thiophene (for P3) were prepared by Stille coupling polymerization. The optical, electrochemical and thermal properties of polymers P1–P3 were studied and their applications in organic field effect transistors (OFETs) were also investigated. These new polymers have good solubility in common organic solvents and exhibit good thermal stability. Polymers P1 and P3 entered nematic liquid crystalline phases above 213 and 313 °C, respectively. The average field-effect hole mobilities were evaluated to be 0.15, 3 × 10−3 and 0.05 cm2 V−1 s−1 for P1, P2 and P3, respectively, under ambient conditions, with a high on/off ratios of 105–107. All the OFETs based on these polymers showed good environmental stability when stored in air.
一种新的噻吩融合萘二甲酰亚胺结构单元--9-(2-癸基十四烷基)-8H-二噻吩-[3′,2′:3,4; 2′′,3′′:5,6]苯并[1,2-f]异吲哚-8,10(9H)-二酮 (4),并以该结构单元和富电子单元(如 4,4′-二十二烷基-2,2′-噻吩(P1)、苯并[1,2-b:4,5-b′]二噻吩(P2)和 3,6-十二烷基噻吩并[3,2-b]噻吩(P3)。研究了 P1-P3 聚合物的光学、电化学和热学特性,并探讨了它们在有机场效应晶体管(OFET)中的应用。这些新型聚合物在常见有机溶剂中具有良好的溶解性和热稳定性。聚合物 P1 和 P3 分别在 213 ℃ 和 313 ℃ 以上进入向列液晶相。在环境条件下,P1、P2 和 P3 的平均场效应空穴迁移率分别为 0.15、3 × 10-3 和 0.05 cm2 V-1 s-1,导通/截止比高达 105-107。所有基于这些聚合物的 OFET 在空气中储存时都表现出良好的环境稳定性。