Solution processed low-voltage organic transistors based on self-assembled monolayer gate dielectrics

James M. Ball, Paul H. Wöbkenberg, Florian Colléaux, Jeremy Smith, Donal D.C. Bradley, Thomas D. Anthopoulos

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Reduction in the operating voltage of organic field-effect transistors (OFETs) is sought for their successful implementation into future portable and low-power electronic applications. Here we demonstrate OFETs with operation below 2 V enabled by the use of self-assembled monolayer (SAM) gate dielectrics with high geometrical capacitances. A high surface energy monolayer is chosen to allow processing of small molecule semiconductors from solution. Impedance spectroscopy measurements of metal-insulator-semiconductor devices suggest the geometrical capacitance of the alumina-SAM dielectric can reach ∼1 μF/cm2 when accumulating charge at the semiconductor-insulator interface. Atomic force microscopy images reveal that the glass substrates and the SAM-functionalized aluminum gate electrode display significant roughness. Despite this, mobilities of 0.02 cm2/Vs are demonstrated. These results represent an important step towards low-power solution processable electronics.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
DOIs
StatePublished - Dec 1 2009
Externally publishedYes
EventOrganic Field-Effect Transistors VIII - San Diego, CA, United States
Duration: Aug 3 2009Aug 5 2009

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7417
ISSN (Print)0277-786X

Other

OtherOrganic Field-Effect Transistors VIII
CountryUnited States
CitySan Diego, CA
Period08/3/0908/5/09

Keywords

  • Atomic force microscopy
  • Low-voltage
  • Metal-insulator-semiconductor
  • Organic field-effect transistor
  • Organic semiconductor
  • Organic thin-film transistor
  • Self-assembled monolayer

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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