Injection-limited electron current in a methanofullerene

J.K.J. Duren, van, V.D. Mihailetchi, P.W.M. Blom, T. Woudenbergh, van, J.C. Hummelen, M.T. Rispens, R.A.J. Janssen, M.M. Wienk

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Abstract

The dark current of bulk-heterojunction photodiodes consisting of a blend of a methanofullerene (PCBM) as n-type electron acceptor and a dialkoxy-(p-phenylene vinylene) (OC1C10-PPV) as a p-type electron donor sandwiched between electrodes with different work functions was studied. With ohmic contacts for hole and electron injection, the dark current appears completely dominated by the electron current in the PCBM, as a result of a much higher electron mobility. This electron current is bulk space-charge limited. With Au as a high work function metal, the electron current becomes injection limited. The injection-limited electron current from the Au electrode into PCBM is explained within a thermally assisted hopping model. In spite of the presence of an injection barrier of .apprx.0.76 eV, the injection-limited electron current from a Au electrode into PCBM still exceeds the bulk-limited hole current in OC1C10-PPV
Original languageEnglish
Pages (from-to)4477-4479
JournalJournal of Applied Physics
Volume94
Issue number7
DOIs
Publication statusPublished - 2003

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