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- Title
Coplanar Donor-Acceptor Semiconducting Copolymers to Achieve Better Conjugated Structures: Side-Chain Engineering.
- Authors
Pei, Mingyuan; Kim, Ji‐Hoon; On, Sungmin; Lee, Han‐Koo; Cho, Kilwon; Hwang, Do‐Hoon; Yang, Hoichang
- Abstract
It is reported on the allocation effects of branched alkyl chains, when used as solubility and ordering enhancers of the conjugated donor-accepter (D-A) copolymer backbones, on the ordering and π-π overlapping of the copolymers, that drastically affect the electrical properties of organic field-effect transistors (OFETs). Triisopropylsilylethynyl-benzo[1,2-b:4,5-b′]dithiophene (TIPSBDT) and diketopyrrolopyrrole (DPP)-based copolymers, which have two linear alkyl spacers (methylene (C1) or butylene (C4)) between the DPP and side-substituent (C10H21) CH(C8H17)-, are synthesized by Suzuki cross-coupling. These copolymer films are spun cast onto a polymer-treated SiO2 dielectric surface, and some are further thermally annealed. The longer spacer, C4, is found to efficiently enhance the coplanarity and conjugation of the D-A backbone, while the C1 does not. The resulting C4-bridged TIPSBDTDPP-based copolymer readily develops a superior π-extended layer on the dielectric surface; the edge-on chains with randomly oriented side chains can be closely packed with a short π-planar distance (d(010)) of 3.57 Å. Its properties are superior to those of the short spacer C1 system with d(010) ≈3.93 Å. The C4-bridged TIPSBDT-DPP copolymer films yield a field-effect mobility up to 1.2 cm² V-1 s-1 in OFETs, 12 times as higher than that of the C1 spacer system.
- Subjects
ELECTRIC properties of polymers; COPOLYMERS; CONJUGATED polymers; SOLUBILITY; ORGANIC field-effect transistors
- Publication
Macromolecular Chemistry & Physics, 2017, Vol 218, Issue 16, p1
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.201700135