title: Vacuum-processed polyethylene as a dielectric for low operating voltage organic field effect transistors.
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 C60as the organic semiconductor, we demonstrate low operating voltage transistors with field effect mobilities in excess of 4 cm2/Vs. Devices with pentacene showed a mobility of 0.16 cm2/Vs. Devices using tyrian Purple as semiconductor show low-voltage ambipolar operation with equal electron and hole mobilities of ∼0.3 cm2/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.
authors.affiliation: Department of Polymer Science and Technology, Middle East Technical University, Balgat, Ankara, Turkey ; Linz Institute for Organic Solar Cells (LIOS), Physical Chemistry, Johannes Kepler University, Linz, Austria.
authors.forename: Yasin
authors.initials: Y
authors.lastname: Kanbur
authors.forename: Mihai
authors.initials: M
authors.lastname: Irimia-Vladu
authors.forename: Eric D
authors.initials: ED
authors.lastname: Głowacki
authors.forename: Gundula
authors.initials: G
authors.lastname: Voss
authors.forename: Melanie
authors.initials: M
authors.lastname: Baumgartner
authors.forename: Günther
authors.initials: G
authors.lastname: Schwabegger
authors.forename: Lucia
authors.initials: L
authors.lastname: Leonat
authors.forename: Mujeeb
authors.initials: M
authors.lastname: Ullah
authors.forename: Hizir
authors.initials: H
authors.lastname: Sarica
authors.forename: Sule
authors.initials: S
authors.lastname: Erten-Ela
authors.forename: Reinhard
authors.initials: R
authors.lastname: Schwödiauer
authors.forename: Helmut
authors.initials: H
authors.lastname: Sitter
authors.forename: Zuhal
authors.initials: Z
authors.lastname: Küçükyavuz
authors.forename: Siegfried
authors.initials: S
authors.lastname: Bauer
authors.forename: Niyazi Serdar
authors.initials: NS
authors.lastname: Sariciftci
keywords: Dielectric polymer; Evaporable polyethylene; Low-operating voltage field effect transistors; Vacuum processed polymer