Fluorination of Donor-Acceptor Copolymer Active Layers Enhances Charge Mobilities in Thin-Film Transistors

Brandon H. Smith, Qianqian Zhang, Mary Allison Kelly, Joshua H. Litofsky, Dinesh Kumar, Alexander Hexemer, Wei You, Enrique Daniel Gomez

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Several recent reports have demonstrated that fluorinated analogues of donor/acceptor copolymers surpass nonfluorinated counterparts in terms of performance in electronic devices. Using a copolymer series consisting of fluorinated, partially fluorinated, and nonfluorinated benzotriazole, we confirm that the addition of fluorine substituents beneficially impacts charge transport in polymer semiconductors. Transistor measurements demonstrated a factor of 5 increase in carrier mobilities with the degree of fluorination of the backbone. Furthermore, grazing-incidence X-ray diffraction data indicates progressively closer packing between the conjugated cores and an overall greater amount of π-stacking in the fluorinated materials. It is likely that attractive interactions between the electron-rich donor and fluorinated electron-deficient acceptor units induce very tightly stacking crystallites, which reduce the energetic barrier for charge hopping. In addition, a change in crystallite orientation was observed from primarily edge-on without fluorine substituents to mostly face-on with fluorinated benzotriazole.

Original languageEnglish (US)
Pages (from-to)1162-1167
Number of pages6
JournalACS Macro Letters
Volume6
Issue number10
DOIs
StatePublished - Oct 17 2017

Fingerprint

Fluorination
Fluorine
Thin film transistors
Copolymers
Electrons
Carrier mobility
Crystallites
Charge transfer
Polymers
Transistors
Semiconductor materials
X ray diffraction
benzotriazole

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Smith, Brandon H. ; Zhang, Qianqian ; Kelly, Mary Allison ; Litofsky, Joshua H. ; Kumar, Dinesh ; Hexemer, Alexander ; You, Wei ; Gomez, Enrique Daniel. / Fluorination of Donor-Acceptor Copolymer Active Layers Enhances Charge Mobilities in Thin-Film Transistors. In: ACS Macro Letters. 2017 ; Vol. 6, No. 10. pp. 1162-1167.
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Fluorination of Donor-Acceptor Copolymer Active Layers Enhances Charge Mobilities in Thin-Film Transistors. / Smith, Brandon H.; Zhang, Qianqian; Kelly, Mary Allison; Litofsky, Joshua H.; Kumar, Dinesh; Hexemer, Alexander; You, Wei; Gomez, Enrique Daniel.

In: ACS Macro Letters, Vol. 6, No. 10, 17.10.2017, p. 1162-1167.

Research output: Contribution to journalArticle

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