Charge transport in high-performance ink-jet printed single-droplet organic transistors based on a silylethynyl substituted pentacene/insulating polymer blend

Xiaoran Li, Wiljan T.T. Smaal, Charlotte Kjellander, Bas Van Der Putten, Kevin Gualandris, Edsger C.P. Smits, John Anthony, Dirk J. Broer, Paul W.M. Blom, Jan Genoe, Gerwin Gelinck

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

We present a systematic study of the influence of material composition and ink-jet processing conditions on the charge transport in bottom-gate field-effect transistors based on blends of 6,13-bis(triisopropyl-silylethynyl) pentacene (TIPS-PEN) and polystyrene. After careful process optimizations of blending ratio and printing temperature we routinely can make transistors with an average mobility of 1 cm2/Vs (maximum value 1.5 cm 2/Vs), on/off ratio exceeding 107, and sharp turn-on in current (sub-threshold slopes approaching 60 mV/decade). These characteristics are superior to the TIPS-PEN only transistors. Using channel scaling measurements and scanning Kelvin probe microscopy, the sharp turn-on in current in the blends is attributed to a contact resistance that originates from a thin insulating layer between the injecting contacts and the semiconductor channel.

Original languageEnglish
Pages (from-to)1319-1327
Number of pages9
JournalOrganic Electronics
Volume12
Issue number8
DOIs
StatePublished - Aug 2011

Bibliographical note

Funding Information:
We acknowledge Peter Graat (Philips Research) for helpful discussions. The research leading to these results has received funding from the European Community’s Seventh Framework Programme ( FP7/2007–2013 ) under grant agreement No. 212311 of the ONE-P project and No. 216546 of the FLAME project.

Keywords

  • Blend
  • Contact barrier
  • Organic transistor
  • Single-droplet ink-jet printing
  • Substituted pentacene

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Chemistry (all)
  • Biomaterials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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