Performance improvement of a pentacene organic field-effect transistor through a DNA interlayer

Wei Shi, Junsheng Yu, Wei Huang, Yifan Zheng

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

Organic field-effect transistors (OFETs) with a top-contact structure were fabricated by applying deoxyribonucleic acid (DNA) as a hole injection layer using a simple spray-coating process. Compared with that of the bare OFET, the OFETs incorporated with a DNA hole injection layer exhibited a remarkable enhancement of field-effect mobility from 0.02 to 0.104cm2V -1s-1. By analysing the electrical characteristics of OFETs and the surface morphology of pentacene film, the results showed that the dipole formation effect of the DNA interlayer effectively reduced the contact resistance between gold electrodes and pentacene. Consequently, improved hole injection was obtained along with enhanced electrical characteristics. This effect was also observed in OFETs based on an α-hexathiophene organic semiconductor and OFETs based on silver electrodes. In addition, a guanine base-pair, a major constituent of DNA, was selected to be further analysed and confirmed the existence of the dipole formation effect.

Original languageEnglish (US)
Article number205402
JournalJournal of Physics D: Applied Physics
Volume47
Issue number20
DOIs
StatePublished - May 21 2014

Keywords

  • deoxyribonucleic acid (DNA)
  • dipole formation effect (DFE)
  • hole injection
  • organic field-effect transistor
  • pentacene

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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