Imperial College London


Faculty of Natural SciencesDepartment of Chemistry

Professor of Organic Materials



+44 (0)20 7594 1248m.heeney Website




401GMolecular Sciences Research HubWhite City Campus






BibTex format

author = {Paterson, AF and Mottram, AD and Faber, H and Niazi, MR and Fei, Z and Heeney, M and Anthopoulos, TD},
doi = {10.1002/aelm.201800723},
journal = {Advanced Electronic Materials},
title = {Impact of the gate dielectric on contact resistance in high-mobility organic transistors},
url = {},
volume = {5},
year = {2019}

RIS format (EndNote, RefMan)

AB - The impact of the gate dielectric on contact resistance in organic thin-film transistors (OTFTs) is investigated using electrical characterization, bias-stress stability measurements, and bandgap density of states (DOS) analysis. Two similar dielectric materials, namely Cytop and poly[4,5-difluoro-2,2-bis(trifluoromethyl)-1,3-dioxole-co-tetrafluoroethylene] (Teflon AF2400), are tested in top-gate bottom-contact OTFTs. The contact resistance of Cytop-based OTFTs is found to be greater than that of the AF2400-based devices, even though the metal/OSC interface remains identical in both systems. The Cytop devices are also found to perform worse in bias-stress stability tests which, along with the DOS calculations, suggests that charge trapping at the OSC/dielectric interface is more prevalent with Cytop than AF2400. This increased charge trapping at the Cytop OSC/dielectric interface appears to be associated with the higher contact resistance in Cytop OTFTs. Differences in the molecular structure between Cytop and AF2400 and the large difference in the glass transition temperature of the two polymers may be responsible for the observed difference in the transistor performance. Overall, this study highlights the importance of the gate dielectric material in the quest for better performing OTFTs and integrated circuits.
AU - Paterson,AF
AU - Mottram,AD
AU - Faber,H
AU - Niazi,MR
AU - Fei,Z
AU - Heeney,M
AU - Anthopoulos,TD
DO - 10.1002/aelm.201800723
PY - 2019///
SN - 2199-160X
TI - Impact of the gate dielectric on contact resistance in high-mobility organic transistors
T2 - Advanced Electronic Materials
UR -
UR -
VL - 5
ER -