Please use this identifier to cite or link to this item: https://doi.org/10.1038/nature03376
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dc.titleGeneral observation of n-type field-effect behaviour in organic semiconductors
dc.contributor.authorChua, L.-L.
dc.contributor.authorZaumseil, J.
dc.contributor.authorChang, J.-F.
dc.contributor.authorOu, E.C.-W.
dc.contributor.authorHo, P.K.-H.
dc.contributor.authorSirringhaus, H.
dc.contributor.authorFriend, R.H.
dc.date.accessioned2014-10-16T09:26:31Z
dc.date.available2014-10-16T09:26:31Z
dc.date.issued2005-03-10
dc.identifier.citationChua, 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
dc.identifier.issn00280836
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/96701
dc.description.abstractOrganic 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.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1038/nature03376
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentPHYSICS
dc.description.doi10.1038/nature03376
dc.description.sourcetitleNature
dc.description.volume434
dc.description.issue7030
dc.description.page194-199
dc.description.codenNATUA
dc.identifier.isiut000227494500039
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