Please use this identifier to cite or link to this item: https://doi.org/10.1038/nature03376
Title: General observation of n-type field-effect behaviour in organic semiconductors
Authors: Chua, L.-L. 
Zaumseil, J.
Chang, J.-F.
Ou, E.C.-W.
Ho, P.K.-H. 
Sirringhaus, H.
Friend, R.H.
Issue Date: 10-Mar-2005
Citation: Chua, L.-L., Zaumseil, J., Chang, J.-F., Ou, E.C.-W., Ho, P.K.-H., Sirringhaus, H., Friend, R.H. (2005-03-10). General observation of n-type field-effect behaviour in organic semiconductors. Nature 434 (7030) : 194-199. ScholarBank@NUS Repository. https://doi.org/10.1038/nature03376
Abstract: Organic semiconductors have been the subject of active research for over a decade now, with applications emerging in light-emitting displays and printable electronic circuits. One characteristic feature of these materials is the strong trapping of electrons but not holes1: organic field-effect transistors (FETs) typically show p-type, but not n-type, conduction even with the appropriate low-work-function electrodes, except for a few special high-electron-affinity2-4 or low-bandgap5 organic semiconductors. Here we demonstrate that the use of an appropriate hydroxyl-free gate dielectric-such as a divinyltetramethylsiloxane-bis(benzocyclobutene) derivative (BCB; ref. 6) - can yield n-channel FET conduction in most conjugated polymers. The FET electron mobilities thus obtained reveal that electrons are considerably more mobile in these materials than previously thought. Electron mobilities of the order of 10-3 to 10-2 cm2 V-1 s-1 have been measured in a number of polyfluorene copolymers and in a dialkyl-substituted poly(p-phenylene-vinylene), all in the unaligned state. We further show that the reason why n-type behaviour has previously been so elusive is the trapping of electrons at the semiconductor-dielectric interface by hydroxyl groups, present in the form of silanols in the case of the commonly used SiO2 dielectric. These findings should therefore open up new opportunities for organic complementary metal-oxide semiconductor (CMOS) circuits, in which both p-type and n-type behaviours are harnessed.
Source Title: Nature
URI: http://scholarbank.nus.edu.sg/handle/10635/96701
ISSN: 00280836
DOI: 10.1038/nature03376
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

1,801
checked on Dec 6, 2018

WEB OF SCIENCETM
Citations

1,725
checked on Nov 21, 2018

Page view(s)

43
checked on Dec 7, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.