Thickness scaling of the space-charge-limited current in poly (p -phenylene vinylene)

P.W.M. Blom, C. Tanase, D.M. de Leeuw, R. Coehoorn

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110 Citations (Scopus)


Charge transport in light-emitting diodes (LEDs) based on a poly (p -phenylene vinylene) (PPV) derivative is investigated as a function of sample thickness. Via the thickness dependence, the contributions from the electric field and charge carrier density to the mobility in space-charge-limited (SCL) diodes can be disentangled. It is demonstrated that a field-dependent mobility weakens the thickness dependence of the SCL current, whereas a carrier-density-dependent mobility gives rise to an enhanced thickness dependence. The enhanced thickness dependence of the experimental SCL current in PPV is in agreement with the predictions using a density-dependent mobility only. This observation confirms that in PPV-based LEDs, the hole transport is dominated by filling of the localized states.

Original languageEnglish
Article number092105
Number of pages3
JournalApplied Physics Letters
Issue number9
Publication statusPublished - 28 Feb 2005
Externally publishedYes


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