Interfacial phenomena affecting charge transport in small molecule organic thin-film transistors

Antonio Facchetti*, Choongik Kim, Myung Han Yoon, Tobin J. Marks

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Organic semiconductors exhibiting p-, n-type, or ambipolar majority charge transport are grown on six different bilayer dielectric structures consisting of various spin-coated polymers / HMDS on 300 nm SiO2/p*-Si, and are characterized by AFM, SEM, and WAXRD, followed by field-effect transistor (FET) electrical characterization. It is observed that in case of air-sensitive n-type semiconductors, dielectric surface modifications induce large variations in the corresponding OTFT performance parameters although the film morphologies and microstructures remain similar. In marked contrast, the device performance of air-stable n-type and p-type semiconductors is not significantly affected by the same dielectric surface modifications. This study provides key information on the chemical origin of the charge trapping sites at the FET dielectric-semiconductor interface. In parallel, bottom-contact FETs of n-type oligothiophenes were investigated by a combination of microscopy/electrical measurements and new insights for the poor electron injection efficiency from the Au contacts are presented.

Original languageEnglish (US)
Title of host publicationOrganic Electronics
Subtitle of host publicationMaterials, Devices and Applications
PublisherMaterials Research Society
Pages258-263
Number of pages6
ISBN (Print)9781604234176
DOIs
StatePublished - Jan 1 2006
Event2006 MRS Fall Meeting - Boston, MA, United States
Duration: Nov 27 2006Dec 1 2006

Publication series

NameMaterials Research Society Symposium Proceedings
Volume965
ISSN (Print)0272-9172

Other

Other2006 MRS Fall Meeting
Country/TerritoryUnited States
CityBoston, MA
Period11/27/0612/1/06

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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