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Phys Rev Lett. 2008 Feb 29;100(8):086802. Epub 2008 Feb 26.

Determination of injection barriers in organic semiconductor devices from capacitance measurements.

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  • 1Department of Applied Physics, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands.


The low-frequency differential capacitance of single-carrier (metal/organic semiconductor/metal) devices with a sandwich structure is shown to display a distinct peak if the injection barrier of at least one of the electrodes is sufficiently small. The effect is shown to be caused by the diffusion contribution to the current density. Depending on the height of the injection barriers, the peak voltage can be a few tenths of a volt below the built-in voltage, V_(bi). We show how the peak voltage and the peak height can be used to accurately determine the injection barriers and V_(bi), and we demonstrate the method by applying it to polyfluorene-based devices.

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