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Rep, D.B.A.; Morpurgo, A.F.; Klapwijk, T.M.
Organic electronics, 12/2003, Letnik: 4, Številka: 4Journal Article
We investigate charge injection from gold into regioregular poly(3-hexylthiophene) (P3HT) as a function of doping, by studying the nonlinear current–voltage characteristics of Au/P3HT/Au devices at different doping levels. The comparison of these characteristics allows us to distinguish contact-limited from bulk-limited transport. We demonstrate that there is a significant barrier to charge-injection from the contacts into the polymer, in spite of the good alignment of the Au work-function relative to the energy gap of P3HT and that the contact limitation is particularly strong at low doping levels. The contact resistance with a Ti electrode is similarly doping-level dependent. Our results show that the ability to control the doping level in organic semiconductors can be used as a tool to investigate the electronic properties of devices prepared from these materials.
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