Financial support from the ERC project SUPRAFUNCTION (GA-257305), the EC Marie-Curie projects IEF-MULTITUDES (PIEF-GA-2012-326666) and ITN iSwitch (GA no. 642196), the Agence Nationale de la Recherche through the LabEx project Chemistry of Complex Systems (ANR-10-LABX-0026_CSC), and the International Center for Frontier Research in Chemistry (icFRC). The computational work was supported by the Interuniversity Attraction Pole Programme (P7/05) initiated by the Belgian Science Policy Office, and by the Belgian National Fund for Scientific Research (FNRS). J.C. is an FNRS research director. Colin Van Dyck is a recipient of a Gustave Boël – Sofina Fellowship of the Belgian American Educational Foundation (BAEF). K.M., F.R. and M.M. acknowledge financial support by the Swiss National Science Foundation (SNF) and the Swiss Nanoscience Institute (SNI)

Artacho

Asadi

Azzam

Boudinet

Boulas

Brete

Béthencourt

Bürgi

Cavallini

Cheng

Cornil

Crivillers

Crudden

Delalande

Dhirani

Hamilton

Hohman

Hong

Junquera

Kang

Kuzumoto

Leydecker

Lide

MacLeod

Masillamani

Monkhorst

Orgiu

Park

Piot

Poirier

Protsailo

Richards

Rissner

Schwartz

Smith

Stoliar

Street

Tersoff

Thuo

Wang

Winroth

Wold

Yamada

Yang

Zhou

Journal of Materials Chemistry C

The rapid increase in charge carrier mobility in organic field-effect transistors (OFETs) in the past few years, with a number of reports >10 cm2 V−1 s−1, calls for a simultaneous improvement in charge injection at the electrode–semiconductor interface. Chemical modification of the electrodes with self-assembled monolayers (SAMs) allows the optimization of three key properties for lowering the contact resistance, thus fine-tuning the charge injection into OFET channels: the electrode work function, the surface energy of the modified electrodes and tunnelling resistance of the SAM. Understanding of the interplay of these properties is of vital importance for organic device design. In this paper, we report a model study based on the modulation of all three of these properties via chemisorption of fluorinated mono- or biphenylthiol molecules (PFBT and PF2BT, respectively) onto gold electrodes. Density functional theory simulations confirm the higher work function of the PFBT monolayers compared to PF2BT and provide evidence that this work function difference is entirely due to differences in the bond dipole to the gold surface. This observation is of importance for the development of future SAM molecules both for organic electronics and across the field of surface chemistry. Incorporation of these SAM-modified Au surfaces as the source and drain electrodes of an OFET with prototypical polymer semiconductors exhibiting different transport levels makes it possible to unravel the role of energetic alignment as well as surface energy and tunnelling resistance on the device performance. Interestingly, our results show that it is not always the high work function PFBT-modified electrodes that give the lowest contact resistance

Fenwick, O. (Olivier James)

Van Dyck, C. (Colin)

Murugavel, K. (Kathiresan)

Cornil, D. (David)

Reinders, F. (Federica)

Haar, S. (Sébastien)

Mayor, M. (Marcel)

Cornil, J. (Jérôme)

Samori, P. (Paolo)

univOAK

Modulating the charge injection in organic field-effect transistors: fluorinated oligophenyl self-assembled monolayers for high work function electrodes

International audienceThe rapid increase in charge carrier mobility in organic field-effect transistors (OFETs) in the past few years, with a number of reports 410 cm 2 V À1 s À1 , calls for a simultaneous improvement in charge injection at the electrode-semiconductor interface. Chemical modification of the electrodes with self-assembled monolayers (SAMs) allows the optimization of three key properties for lowering the contact resistance, thus fine-tuning the charge injection into OFET channels: the electrode work function, the surface energy of the modified electrodes and tunnelling resistance of the SAM. Understanding of the interplay of these properties is of vital importance for organic device design. In this paper, we report a model study based on the modulation of all three of these properties via chemisorption of fluorinated mono-or biphenylthiol molecules (PFBT and PF2BT, respectively) onto gold electrodes. Density functional theory simulations confirm the higher work function of the PFBT monolayers compared to PF2BT and provide evidence that this work function difference is entirely due to differences in the bond dipole to the gold surface. This observation is of importance for the development of future SAM molecules both for organic electronics and across the field of surface chemistry. Incorporation of these SAM-modified Au surfaces as the source and drain electrodes of an OFET with prototypical polymer semiconductors exhibiting different transport levels makes it possible to unravel the role of energetic alignment as well as surface energy and tunnelling resistance on the device performance. Interestingly, our results show that it is not always the high work function PFBT-modified electrodes that give the lowest contact resistance.</div

Fenwick, Oliver

van Dyck, Colin

Murugavel, Kathiresan

Cornil, David

Reinders, Federica

Haar, Sébastien

Mayor, Marcel

Cornil, Jérôme

Samorì, Paolo

HAL-Inserm

Dyck, Colin Van

Samori, Paolo

edoc

Experiment and theory reveals origin of work function and contact resistance of fluorinated oligophenylthiol-treated electrodes in organic transistors.</p

Oliver Fenwick

Colin Van Dyck

Kathiresan Murugavel

David Cornil

Federica Reinders

Sébastien Haar

Marcel Mayor

Jérôme Cornil

Paolo Samorì

Crossref

peer reviewedThe rapid increase in charge carrier mobility in organic field-effect transistors (OFETs) in the past few years, with a number of reports >10 cm2 V-1 s-1, calls for a simultaneous improvement in charge injection at the electrode-semiconductor interface. Chemical modification of the electrodes with self-assembled monolayers (SAMs) allows the optimization of three key properties for lowering the contact resistance, thus fine-tuning the charge injection into OFET channels: the electrode work function, the surface energy of the modified electrodes and tunnelling resistance of the SAM. Understanding of the interplay of these properties is of vital importance for organic device design. In this paper, we report a model study based on the modulation of all three of these properties via chemisorption of fluorinated mono- or biphenylthiol molecules (PFBT and PF2BT, respectively) onto gold electrodes. Density functional theory simulations confirm the higher work function of the PFBT monolayers compared to PF2BT and provide evidence that this work function difference is entirely due to differences in the bond dipole to the gold surface. This observation is of importance for the development of future SAM molecules both for organic electronics and across the field of surface chemistry. Incorporation of these SAM-modified Au surfaces as the source and drain electrodes of an OFET with prototypical polymer semiconductors exhibiting different transport levels makes it possible to unravel the role of energetic alignment as well as surface energy and tunnelling resistance on the device performance. Interestingly, our results show that it is not always the high work function PFBT-modified electrodes that give the lowest contact resistance

Van Dyck, Colin

ORBi UMONS

Modulating the charge injection in organic field-effect transistors: Fluorinated oligophenyl self-assembled monolayers for high work function electrodes

Fenwick, O

Van Dyck, C

Murugavel, K

Cornil, D

Reinders, F

Haar, S

Mayor, M

Cornil, J

Samori, P

Queen Mary Research Online

Fenwick, O.

Van Dyck, C.

Murugavel, K.

Cornil, D.

Reinders, F.

Haar, S.

Mayor, M.

Cornil, J.

Samori, P.

Repository KITopen

https://univoak.eu/islandora/object/islandora:55010/datastream/PDF/download/citation.pdf

Modulating the charge injection in organic field-effect transistors: fluorinated oligophenyl self-assembled monolayers for high work function electrodes

Abstract

Similar works

Full text

Available Versions