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Title:
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Electron Transport in a Methanofullerene
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Author(s):
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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.
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Published by:
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Publication date:
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ECN
Solar Energy
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1-1-2003
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ECN report number:
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Document type:
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ECN-RX--03-007
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Article (scientific)
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Number of pages:
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4
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Published in: Advanced Functional Materials (Wiley-VCH), , 2003, Vol.13, p.43-46.
Abstract:
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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