The Dipole Moment Inversion Effects in Self-Assembled Nanodielectrics for Organic Transistors

Binghao Wang, Gabriele Di Carlo, Riccardo Turrisi, Li Zeng, Katie Stallings, Wei Huang, Michael J. Bedzyk, Luca Beverina*, Tobin J. Marks, Antonio Facchetti

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


We compare and contrast the properties of hybrid organic-inorganic self-assembled nanodielectrics (SANDs) based on alternating layers of solution-processed ZrOx and either of two phosphonic acid-functionalized azastilbazolium π-units having opposite dipolar orientations. Conventional Zr-SAND and new inverted IZr-SAND are characterized by Kevin probe, optical spectroscopy, capacitance-voltage measurements, AFM, X-ray reflectivity, and electronic structure computation. The molecular dipolar orientation affects thin-film transistor (TFT) threshold and turn-on voltages for devices based on either p-channel pentacene or n-channel copper perfluorophthalocyanine. Specifically, Zr-SAND shifts the threshold and turn-on voltages to more positive values, whereas IZr-SAND shifts them in the opposite direction. Capping these SANDs with -SiMe3 groups enhances the effect, affording a 1.3 V difference in turn-on voltage for IZr-SAND vs Zr-SAND-gated organic TFTs. Such tunability should facilitate the engineering of more complex circuits.

Original languageEnglish (US)
Pages (from-to)9974-9980
Number of pages7
JournalChemistry of Materials
Issue number23
StatePublished - Dec 12 2017

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry


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