Electron Transport in a Methanofullerene

V.D. Mihailetchi(University of Groningen), J. K. J. van Duren(Eindhoven University of Technology), Paul W. M. Blom, J.C. Hummelen(University of Groningen), René A. J. Janssen(Eindhoven University of Technology), J.M. Kroon(Energy Research Centre of the Netherlands), Minze T. Rispens(University of Groningen), Wiljan Verhees(Energy Research Centre of the Netherlands), Martijn M. Wienk(Eindhoven University of Technology)
Advanced Functional Materials
January 16, 2003
10.1002/adfm.200390004
Cited by 635

Abstract

Abstract The current–voltage characteristics of methanofullerene [6,6]‐phenyl C 61 ‐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 μ e = 2 × 10 –7 m 2 V –1 s –1 has been obtained. 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) (OC 1 C 10 ‐PPV). As a result, the dark current in PCBM/OC 1 C 10 ‐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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