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New dithienophosphole-based donor-acceptor alternating copolymers: Synthesis and structure property relationships in OFET

  • Min Jae Sung
  • , Yebyeol Kim
  • , Sang Bong Lee
  • , Gi Back Lee
  • , Tae Kyu An
  • , Hyojung Cha
  • , Se Hyun Kim
  • , Chan Eon Park
  • , Yun Hi Kim
  • Gyeongsang National University
  • Pohang University of Science and Technology
  • Korea National University of Transportation
  • Yeungnam University

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Two donor-acceptor conjugated copolymers comprised of a novel dithienophosphole (DTP) as the acceptor unit and bithiophene (BT) or decylthiophenebenzodithiophene (DTBDT) as the donor unit were synthesized and characterized to elucidate the relationship between donor-acceptor (D-A) architecture and organic field-effect transistors (OFETs) performance. These characteristics of D-A copolymers were affected by the structural suitability of donor and acceptor units. Poly(DTP-BT) had an ordered structure that facilitated charge carrier transfer. The crystallinity of poly(DTP-BT) increased as annealing temperature (Tann) increased. In contrast, poly(DTP-DTBDT) was amorphous regardless of Tann due to the long alkyl chains of the DTBDT units. OFET devices made with poly(DTP-BT) and annealed at 200°C exhibit a highly crystalline morphology and a relatively high field-effect mobility (4.9 × 10-3 cm2/(V·s)).

Original languageEnglish
Pages (from-to)316-322
Number of pages7
JournalDyes and Pigments
Volume125
DOIs
StatePublished - Feb 2016

Keywords

  • Dithienophosphole
  • Donor-acceptor (D-A) architecture
  • Organic field effect transistor (OFET)
  • Polymeric semiconductor
  • Well ordered crystalline structure
  • X-ray diffraction

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