New dithienophosphole-based donor–acceptor alternating copolymers: Synthesis and structure property relationships in OFET. (February 2016)

• Record Type: Journal Article
• Authors: Sung, Min Jae; Kim, Yebyeol; Lee, Sang Bong; Lee, Gi Back; An, Tae Kyu; Cha, Hyojung; Kim, Se Hyun; Park, Chan Eon; Kim, Yun-Hi
• Is Part Of: Dyes and pigments. Volume 125(2016)
• Page Start: 316
• Page End: 322
• Publication Date: 2016-02
• Subjects: Organic field effect transistor (OFET) -- Dithienophosphole -- Donor–acceptor (D–A) architecture -- X-ray diffraction -- Polymeric semiconductor -- Well ordered crystalline structure; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2015.09.026
• Languages: English
• ISSNs: 0143-7208

Abstract

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 ( T ann ) increased. In contrast, poly(DTP-DTBDT) was amorphous regardless of T ann 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 cm 2 /(V·s)). Graphical abstract: Highlights: A dithienophosphole derivative (DTP) was used as a novel acceptor for OFETs. The DTP unit was combined with two donors: poly(DTP-BT) and poly(DTP-DTBDT). The DTP-based polymers yielded varied morphology according to donor units. The Poly(DTP-BT) exhibited higher mobility but large V th than poly(DTP-DTBDT).