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

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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