Ion Gel Dynamic Templates for Large Modulation of Morphology and Charge Transport Properties of Solution-Coated Conjugated Polymer Thin Films

Erfan Mohammadi, Chuankai Zhao, Fengjiao Zhang, Ge Qu, Seok Heon Jung, Qiujie Zhao, Christopher Evans, Jin Kyun Lee, Diwakar Shukla, Ying Diao

Research output: Contribution to journalArticle

Abstract

Dynamic surfaces play a critical role in templating highly ordered complex structures in living systems but are rarely employed for directing assembly of synthetic functional materials. We design ion gel templates with widely tunable dynamics (Tg) to template solution-coated conjugated polymers. We hypothesize that the ion gel expedites polymer nucleation by reconfiguring its surface to facilitate cooperative multivalent interactions with the conjugated polymer, validated using both experimental and computational approaches. Varying ion gel dynamics enables large modulation of alignment, molecular orientation, and crystallinity in templated polymer thin films. At the optimal conditions, ion-gel-templated films exhibit 55 times higher dichroic ratio (grazing incidence X-ray diffraction) and 49% increase in the relative degree of crystallinity compared to those templated by the neat polymer matrix. As a result, the maximum hole mobilities increase by factors of 4 and 11 along the π-πstacking and the backbone directions. Intriguingly, we observe a synergistic effect between the gel matrix and the ionic liquid that produces markedly enhanced templating effect than either component alone. Molecular dynamics simulations suggest that complementary multivalent interactions facilitated by template reconfigurability underlie the observed synergy. We further demonstrate field-effect transistors both templated and gated by ion gels with average mobility exceeding 7 cm2 V-1 s-1.

Original languageEnglish (US)
JournalACS Applied Materials and Interfaces
DOIs
StatePublished - Jan 1 2019

Fingerprint

Conjugated polymers
Polymer films
Transport properties
Charge transfer
Gels
Modulation
Ions
Thin films
Ionic Liquids
Hole mobility
Functional materials
Molecular orientation
Field effect transistors
Polymer matrix
Ionic liquids
Molecular dynamics
Polymers
Nucleation
X ray diffraction
Computer simulation

Keywords

  • conjugated polymer
  • dynamic templates
  • ion gel
  • morphology control
  • printed electronics
  • responsive surfaces
  • solution coating

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Ion Gel Dynamic Templates for Large Modulation of Morphology and Charge Transport Properties of Solution-Coated Conjugated Polymer Thin Films. / Mohammadi, Erfan; Zhao, Chuankai; Zhang, Fengjiao; Qu, Ge; Jung, Seok Heon; Zhao, Qiujie; Evans, Christopher; Lee, Jin Kyun; Shukla, Diwakar; Diao, Ying.

In: ACS Applied Materials and Interfaces, 01.01.2019.

Research output: Contribution to journalArticle

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AU - Qu, Ge

AU - Jung, Seok Heon

AU - Zhao, Qiujie

AU - Evans, Christopher

AU - Lee, Jin Kyun

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AU - Diao, Ying

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