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

doi:10.1063/1.1604959

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 language	English
Pages (from-to)	4477-4479
Journal	Journal of Applied Physics
Volume	94
Issue number	7
DOIs	https://doi.org/10.1063/1.1604959
Publication status	Published - 2003

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title = "Injection-limited electron current in a methanofullerene",

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",

author = "{Duren, van}, J.K.J. and V.D. Mihailetchi and P.W.M. Blom and {Woudenbergh, van}, T. and J.C. Hummelen and M.T. Rispens and R.A.J. Janssen and M.M. Wienk",

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AU - Duren, van, J.K.J.

AU - Mihailetchi, V.D.

AU - Blom, P.W.M.

AU - Woudenbergh, van, T.

AU - Hummelen, J.C.

AU - Rispens, M.T.

AU - Janssen, R.A.J.

AU - Wienk, M.M.

PY - 2003

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AB - 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

U2 - 10.1063/1.1604959

DO - 10.1063/1.1604959

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