Selenophene-Flanked Diketopyrrolopyrrole Based Conjugated Polymers for Ambipolar Field-Effect Transistors
作者机构：Beijing National Laboratory for Molecular SciencesCAS Key Laboratory of Organic SolidsCAS Center of Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical SciencesUniversity of Chinese Academy of SciencesBejjing 100049China
出 版 物：《Chinese Journal of Chemistry》 (中国化学（英文版）)
年 卷 期：2020年第38卷第10期
页 面：1075-1080页
核心收录：
学科分类：07[理学] 070305[理学-高分子化学与物理] 0703[理学-化学]
基 金：We would like to thank NSFC(61890943,21790360) National Key R&D Program of China(2018YFE0200700,2017YFA0204701) the Youth Innovation Promotion Association CAS(No.2015024)。
主 题：planar conjugated fused
摘 要：Summary of main observation and conclusion The development of selenophene-flanked DPP(SeDPP)based copolymers,especially for the ambipolar ones,lags behind other aromatic group flanked DPP-based polymers.Herein,we report two new ambipolar SeDPP-based conjugated polymers.One is the alternating polymer PSeDPPFT with normal SeDPP and 3,4-difluorothiophene units.The other is PSeFDFT,in which the electron acceptor unit is replaced by a new SeDPP derivative,referred as to half-fused SeDPP.The more planar structure of half fused SeDPP endows the backbone of PSeFDFT with good rigidity and planarity.Both polymers exhibit ambipolar transporting properties in air.The PSeFDFT based fleld-effect transistors(FETs)display higher and more balanced ambipolar properties with μnave of 0.27 cm2·V-1·s-1,μe ave of 0.18 cm2·V-1·s-1,and μh ave/μeave of 1.5 than those of PSeDPPFT(μhave=0.11cm2·V-1·s-1,μeave=0.042cm2·V-1·s-1,and μh/μe=2.6).This is attributed to the more planar structure,lower LUMO level,higher HOMO level,and better interchain packing orientations of PSeFDFT by comparing with PSeDPPFT.Therefore,a new molecular design strategy to modulate the hole and electron transporting properties is proposed for conjugated D-A polymers.
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