1D versus 2D Growth of Soluble Acene Crystals from Soluble Acene/Polymer Blends Governed by a Residual Solvent Reservoir in a Phase-Separated Polymer Matrix

Jung Hun Lee, Hyun Ho Choi, Yeong Don Park, John E. Anthony, Jung Ah Lim, Jangwhan Cho, Dae Sung Chung, Jinhyun Hwang, Ho Won Jang, Kilwon Cho, Wi Hyoung Lee

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

The growth mechanism of soluble acene is highly dependent on the remaining residual solvent following solution processing. The relationship between the amount of residual solvent and the growth modes of a prototypical soluble acene, 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene) are examined under spin casting TIPS-pentacene/insulating polymer blends. Changing spin time of the blend solution allows to control the amount of residual solvent, which significantly determines the growth modes of TIPS-pentacene vertically segregated onto the insulating polymer. In situ observation of crystal growth reveals that excess residual solvent in short spin time induces a convective flow in a drying droplet, thereby resulting in 1D growth of TIPS-pentacene crystals. On the other hand, optimal amount of residual solvent in a moderate spin time results in 2D growth of TIPS-pentacene crystals. The well-developed 2D spherulites allow for higher field-effect mobility than that of the 1D crystals because of the higher perfectness and coverage of TIPS-pentacene crystals. The use of other types of soluble acene and insulating polymer only changes the kinetics of crystallization, while the transition of growth mode from 1D to 2D is still observed. This general growth mechanism facilitates the understanding of crystallization behavior of soluble acene for the development of high-performance organic transistors.

Original languageEnglish
Article number1802875
JournalAdvanced Functional Materials
Volume28
Issue number34
DOIs
StatePublished - Aug 22 2018

Bibliographical note

Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • blends
  • crystal growth modes
  • organic field-effect transistors
  • residual solvents
  • soluble acene

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Chemistry
  • Condensed Matter Physics
  • General Materials Science
  • Electrochemistry
  • Biomaterials

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