Imperial College London


Faculty of Natural SciencesDepartment of Physics

Visiting Professor



+44 (0)20 7594 6669thomas.anthopoulos Website




Mrs Carolyn Dale +44 (0)20 7594 7579




1111Blackett LaboratorySouth Kensington Campus






BibTex format

author = {Paterson, AF and Faber, H and Savva, A and Nikiforidis, G and Gedda, M and Hidalgo, TC and Chen, X and McCulloch, I and Anthopoulos, TD and Inal, S},
doi = {10.1002/adma.201902291},
journal = {Adv Mater},
pages = {e1902291--e1902291},
title = {On the Role of Contact Resistance and Electrode Modification in Organic Electrochemical Transistors.},
url = {},
year = {2019}

RIS format (EndNote, RefMan)

AB - Contact resistance is renowned for its unfavorable impact on transistor performance. Despite its notoriety, the nature of contact resistance in organic electrochemical transistors (OECTs) remains unclear. Here, by investigating the role of contact resistance in n-type OECTs, the first demonstration of source/drain-electrode surface modification for achieving state-of-the-art n-type OECTs is reported. Specifically, thiol-based self-assembled monolayers (SAMs), 4-methylbenzenethiol (MBT) and pentafluorobenzenethiol (PFBT), are used to investigate contact resistance in n-type accumulation-mode OECTs made from the hydrophilic copolymer P-90, where the deliberate functionalization of the gold source/drain electrodes decreases and increases the energetic mismatch at the electrode/semiconductor interface, respectively. Although MBT treatment is found to increase the transconductance three-fold, contact resistance is not found to be the dominant factor governing OECT performance. Additional morphology and surface energy investigations show that increased performance comes from SAM-enhanced source/drain electrode surface energy, which improves wetting, semiconductor/metal interface quality, and semiconductor morphology at the electrode and channel. Overall, contact resistance in n-type OECTs is investigated, whilst identifying source/drain electrode treatment as a useful device engineering strategy for achieving state of the art n-type OECTs.
AU - Paterson,AF
AU - Faber,H
AU - Savva,A
AU - Nikiforidis,G
AU - Gedda,M
AU - Hidalgo,TC
AU - Chen,X
AU - McCulloch,I
AU - Anthopoulos,TD
AU - Inal,S
DO - 10.1002/adma.201902291
EP - 1902291
PY - 2019///
SP - 1902291
TI - On the Role of Contact Resistance and Electrode Modification in Organic Electrochemical Transistors.
T2 - Adv Mater
UR -
UR -
ER -