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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.
Mihailetchi et al. (2003) studied this question.