Molecularly Smooth Self-Assembled Monolayer for High-Mobility Organic Field-Effect Transistors

Saurabh Das, Byoung Hoon Lee, Roscoe T.H. Linstadt, Keila Cunha, Youli Li, Yair Kaufman, Zachary A. Levine, Bruce H. Lipshutz, Roberto D. Lins, Joan Emma Shea, Alan J. Heeger, B. Kollbe Ahn

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


Despite the need for molecularly smooth self-assembled monolayers (SAMs) on silicon dioxide surfaces (the most common dielectric surface), current techniques are limited to nonideal silane grafting. Here, we show unique bioinspired zwitterionic molecules forming a molecularly smooth and uniformly thin SAM in "water" in <1 min on various dielectric surfaces, which enables a dip-coating process that is essential for organic electronics to become reality. This monomolecular layer leads to high mobility of organic field-effect transistors (OFETs) based on various organic semiconductors and source/drain electrodes. A combination of experimental and computational techniques confirms strong adsorption (Wad > 20 mJ m-2), uniform thickness (0.5 or 1 nm) and orientation (all catechol head groups facing the oxide surface) of the "monomolecular" layers. This robust (strong adsorption), rapid, and green SAM represents a promising advancement toward the next generation of nanofabrication compared to the current nonuniform and inconsistent polysiloxane-based SAM involving toxic chemicals, long processing time (>10 h), or heat (>80 °C).

Original languageEnglish
Pages (from-to)6709-6715
Number of pages7
JournalNano Letters
Issue number10
StatePublished - 12 Oct 2016

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.


  • bioinspired self-assembled monolayer
  • nanofabrication
  • organic field-effect transistor
  • polysiloxane
  • zwitterionic molecules


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