A timely synthetic tailoring of biaxially extended thienylenevinylene-like polymers for systematic investigation on field-effect transistors

Dohyuk Yoo, Benjamin Nketia-Yawson, Seok Ju Kang, Hyungju Ahn, Tae Joo Shin, Yong Young Noh, Changduk Yang

Research output: Contribution to journalArticlepeer-review

57 Scopus citations

Abstract

Considering there is growing interest in the superior charge transport in the ( E )-2-(2-(thiophen-2-yl)-vinyl)thiophene (TVT)-based polymer family, an essential step forward is to provide a deep and comprehensive understanding of the structure-property relationships with their polymer analogs. Herein, a carefully chosen set of DPP-TVT-n polymers are reported here, involving TVT and diketopyrrolopyrrole (DPP) units that are constructed in combination with varying thiophene content in the repeat units, where n is the number of thiophene spacer units. Their OFET characteristics demonstrate ambipolar behavior; in particular, with DPP-TVT-0 a nearly balanced hole and electron transport are observed. Interestingly, the majority of the charge-transport properties changed from ambipolar to p-type dominant, together with the enhanced hole mobilities, as the electron-donating thiophene spacers are introduced. Although both the lamellar d-spacings and π-stacking distances of DPP-TVT-n decreased with as the number of thiophene spacers increased, DPP-TVT-1 clearly shows the highest hole mobility (up to 2.96 cm2 V-11 s-1) owing to the unique structural conformations derived from its smaller paracrystalline distortion parameter and narrower plane distribution relative to the others. These in-depth studies should uncover the underlying structure-property relationships in a relevant class of TVT-like semiconductors, shedding light on the future design of top-performing semiconducting polymers.

Original languageEnglish
Pages (from-to)586-596
Number of pages11
JournalAdvanced Functional Materials
Volume25
Issue number4
DOIs
StatePublished - 28 Jan 2015

Keywords

  • Diketopyrrolopyrrole
  • Organic field-effect transistors
  • Paracrystalline distortion parameters
  • Plane distribution
  • Thienylenevinylene

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