Vacuum-processed polyethylene as a dielectric for low operating voltage organic field effect transistors


Kanbur Y., Irimia-Vladu M., Glowacki E. D. , Voss G., Baumgartner M., Schwabegger G., ...More

ORGANIC ELECTRONICS, vol.13, no.5, pp.919-924, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 13 Issue: 5
  • Publication Date: 2012
  • Doi Number: 10.1016/j.orgel.2012.02.006
  • Journal Name: ORGANIC ELECTRONICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.919-924
  • Keywords: Dielectric polymer, Vacuum processed polymer, Evaporable polyethylene, Low-operating voltage field effect transistors, FILMS
  • Middle East Technical University Affiliated: Yes

Abstract

We report on the fabrication and performance of vacuum-processed organic field effect transistors utilizing evaporated low-density polyethylene (LD-PE) as a dielectric layer. With C-60 as the organic semiconductor, we demonstrate low operating voltage transistors with field effect mobilities in excess of 4 cm(2)/Vs. Devices with pentacene showed a mobility of 0.16 cm(2)/Vs. Devices using tyrian Purple as semiconductor show low-voltage ambipolar operation with equal electron and hole mobilities of similar to 0.3 cm(2)/Vs. These devices demonstrate low hysteresis and operational stability over at least several months. Grazing-angle infrared spectroscopy of evaporated thin films shows that the structure of the polyethylene is similar to solution-cast films. We report also on the morphological and dielectric properties of these films. Our experiments demonstrate that polyethylene is a stable dielectric supporting both hole and electron channels. (C) 2012 Elsevier B.V. All rights reserved.