Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 99: Organic Semiconductors: Transport
HL 99.6: Vortrag
Freitag, 30. März 2012, 10:45–11:00, EW 203
Bipolar organic semiconductors: application in thin film transistors and photovoltaic cells — •Andreas Opitz1,2, Andreas Wilke1, Norbert Koch1, Mark Gruber2, Ulrich Hörmann2, Matthias Horlet2, Michael Kraus2, Julia Wagner2, and Wolfgang Brütting2 — 1Institut für Physik, Humboldt-Universität zu Berlin — 2Institut für Physik, Universität Augsburg
Organic semiconductors used in thin-film devices have traditionally been reported as either electron or hole transporting materials. For this contribution the transport of electrons and holes in molecular semiconductors is analysed in organic field-effect transistors [1]. Additionally the ability of molecular semiconductors to act as donor or acceptor material was investigated [2,3]. Furthermore the device behaviour is compared to the energy levels of the semiconductors [2].
Our findings show that the classical distinction between hole and electron conducting organic semiconductors is mostly related to the suppression of electron transport due to electron traps at oxide surfaces for the former and the impossibility of hole injection into the deep lying HOMO level for the latter. By adjusting the energy levels for injection at the contacts and for exciton dissociation at the organic/organic interface the same molecular semiconductors (e.g. diindenoperylene) can be used as active material in light-emitting transistors and as donor or acceptor material in solar cells with the appropriate counterpart.
[1] M. Horlet et al., Appl. Phys. Lett. 98 (2011) 233304.
[2] J. Wagner et al., Adv. Func. Mater. 20 (2010) 4295.
[3] U. Hörmann et al., phys. stat. sol. RRL 5 (2011) 241.