Controlling Conjugation and Solubility of Donor鈥揂cceptor Semiconducting Copolymers for High-Performance Organic Field-Effect Transistors

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• 作者：Mi Jang ; Ji-Hoon Kim ; Do-Hoon Hwang ; Hoichang Yang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：June 17, 2015
• 年：2015
• 卷：7
• 期：23
• 页码：12781-12788
• 全文大小：537K
• ISSN：1944-8252

文摘

Diketopyrrolopyrrole (DPP)-based copolymers, including poly[2,5-bis(2-octyldodecyl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione-(E)-1,2-di([2,2鈥?bithiophen]-5-yl)ethene] (PDDBE) and poly[2,5-bis(2-octyldodecyl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione-(E)-1,2-bis(6-hexylthieno[3,2-b]thiophen-2-yl)ethene] (PDTTE), were synthesized by alternating a DPP-derivative acceptor (A) block with different donor (D) blocks, such as (E)-1,2-di([2,2鈥?bithiophen]-5-yl)ethene (DBE) and (E)-1,2-bis(6-hexylthieno[3,2-b]thiophen-2-yl)ethene (TTE). As solution-processed semiconducting channel layers in organic field-effect transistors (OFETs), PDDBE and PDTTE copolymers had drastically different ordered structures on polymer-grafted SiO₂ dielectrics. Multiple-layered domains of PDDBE had a long-range, 蟺-conjugated extension but a wide 蟺-stacking distance, d₍₀₁₀₎, of 3.90 脜. One-dimensional nanorod-percolated agglomerates of PDTTE had a much shorter d₍₀₁₀₎ of 3.71 脜, originating from the alternating A鈥揇 structures of the DPP derivative with different D blocks. The corresponding ordered domains yielded a wide range of field-effect mobilities from 0.01 to 1.40 cm² V^鈥? s^鈥? in the OFETs.