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ECN publication
Electron Transport in a Methanofullerene
Kroon, J.M.; Verhees, W.J.H.; Mihailetchi, V.D.; Duren, J.K.J. van; Blom, P.W.M.; Hummelen, J.C.; Janssen, R.A.J.; Rispens, T.; Wienk, M.M.
Published by: Publication date:
ECN Solar Energy 1-1-2003
ECN report number: Document type:
ECN-RX--03-007 Article (scientific)
Number of pages:

Published in: Advanced Functional Materials (Wiley-VCH), , 2003, Vol.13, p.43-46.

The current-voltage characteristics of methanofullerene [6,6]-phenylC61-butyric acid methyl ester (PCBM)-based devices are investigated as a function of temperature. The occurrence of space-charge limited current enables a direct determination of the electron mobility. At room temperature, an electron mobility of uc = 2 x 10 -7 m2V-1s-1 has been optained. This electron mobility is more than three orders of magnitude larger than the hole mobility of donor-type conjugated polymer poly(2-methoxy-5-(3',7'-dimethyloctyloxy)-p-phenylene vinylene) (OC1C10-PPV). As a result, the dark current in PCBM/OC1C10-PPV based devices is completely dominated by electrons. The observed field and temperature-dependence of the electron mobility of PCBM can be described with a Gaussian disorder model. This provides information about the energetic disorder and average transport-site separation in PCBM.

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