Biaxially Extended Conjugated Polymers with Thieno[3,2-b]thiophene Building Block for High Performance Field-Effect Transistor Applications

详细信息    查看全文

• 作者：Pei-Yin Chao ; Hung-Chin Wu ; Chien Lu ; Chian-Wen Hong ; Wen-Chang Chen
• 刊名：Macromolecules
• 出版年：2015
• 出版时间：August 25, 2015
• 年：2015
• 卷：48
• 期：16
• 页码：5596-5604
• 全文大小：537K
• ISSN：1520-5835

文摘

Biaxially thiophene side chain extended thieno[3,2-b]thiophene (TT2T)-based polymers, PTTT2T, P2TTT2T, PTTTT2T, and PTVTTT2T, were synthesized by Stille coupling polymerization with different conjugated moieties of thiophene (T), bithiophene (2T), thieno[3,2-b]thiophene (TT), and thiophene鈥搗inylene鈥搕hiophene (TVT), respectively. The electronic properties of the prepared polymers could be effectively tuned because the variant 蟺-conjugated building block affected the backbone conformation and the resulted morphology. The morphology of the thin films characterized by atomic force microscopy and grazing incidence X-ray diffraction showed that P2TTT2T and PTVTTT2T thin films possessed a better molecular packing with a nanofiber structure owing to their coplanar backbone. The average field-effect mobilities of PTTT2T, P2TTT2T, PTTTT2T, and PTVTTT2T were 6.7 脳 10^鈥?, 0.36, 2.2 脳 10^鈥?, and 0.64 cm² V^鈥? s^鈥? (maximum 0.71), respectively, attributed to the coplanarity of polymer skeleton. In addition, the fabricated FET devices showed a high on/off ratio over 10⁷ under ambient for over 3 months, suggesting the excellent environmental stability. The above results demonstrated that the biaxially extended fused thiophene based conjugated polymers could serve as a potential candidate for organic electronic device applications.