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Synthesis and characterization of donor-acceptor π-conjugated polymers for studying their charge transport properties 원문보기

  • 저자

    양다슬

  • 학위수여기관

    Graduate School, Korea University

  • 학위구분

    국내석사

  • 학과

    화학과

  • 지도교수

    최동훈

  • 발행년도

    2014

  • 총페이지

    xiii, 86장

  • 키워드

    Thin-film transistor Diketopyrrolopyrrole Conjugated polymer;

  • 언어

    eng

  • 원문 URL

    http://www.riss.kr/link?id=T13541931&outLink=K  

  • 초록

    Organic thin film transistors (OTFTs) have high potential to be applicable to the next generation of soft electronic devices due to their flexibility, light weight and low-cost manufacturing process at large area. However, there is a problem that the charge transport property of the organic material-based devices is inferior to that of inorganic devices. In order to overcome the shortcoming, there have been intensive reports on changes in manufacturing process, development of new materials containing flat conjugative moieties such as diketopyrrolopyrrole (DPP), isoindigo (IID), thienopyrroledione (TPD) and so on. In this study, four different DPP-based donor-acceptor conjugated polymers were synthesized and their properties were investigated. The polymers consist of alternate electron rich unit (donor) and electron deficient unit (acceptor) which can derive extensive delocalization of -electron along their backbone. Firstly, pyrene was selected as a donor unit because of its planar structure which can induce strong propensity for π-π stacking. Two new pyrene containing conjugated polymers were designed and synthesized. By changing the anchoring position of dithienyl DPP from 1,6- to the 2,7-position of the pyrene ring, the energies of the molecular frontier orbitals of the substituted polymers were successfully tuned. The organic thin-film transistors made of the P(DTDPP-alt-(2,7)PY) exhibited higher mobility (0.23 cm2 V–1 s–1) than that obtained using P(DTDPP-alt-(1,6)PY) due to more favorable edge-on orientation of polymer chains on the substrate. Secondly, the tellurophene unit was selected as a strong donor in the polymer repeating group. Polytellurophenes could be capable of supramolecular interactions owing to strong Te-Te interactions. Also, tellurophene has a narrow HOMO-LUMO band gap which could lead to red-shifted optical absorptions compared to those of polythiophenes. However, despite of advantages of tellurophene, a limited number of studies have been reported to date. The reason is that the synthesis of tellurophene moiety is very difficult to conduct. Despite the difficulties, tellurophene-containing conjugated polymer was successfully synthesized via Stille coupling reaction. As expected, tellurophene-containing polymer exhibited a high hole carrier mobility of 1.47 cm2 V-1 s-1. In brief, donor-acceptor type conjugate polymers were synthesized for Organic thin-film transistors (OTFTs). The diketopyrrolopyrrole (DPP) unit has been studied extensively due to their planar structure and specific molecular interaction. Thermal analysis, cyclic voltammetry, absorption spectroscopy and morphological analysis were employed to investigate their intrinsic properties. Eventually, thin film transistors were fabricated to study their semiconducting property.


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