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Electron Transport in a Methanofullerene
Author(s) -
Mihailetchi V.D.,
van Duren J.K.J.,
Blom P.W.M.,
Hummelen J.C.,
Janssen R.A.J.,
Kroon J.M.,
Rispens M.T.,
Verhees W.J.H.,
Wienk M.M.
Publication year - 2003
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200390004
Subject(s) - materials science , electron mobility , electron , electron transport chain , optoelectronics , space charge , conjugated system , polymer , analytical chemistry (journal) , organic chemistry , chemistry , composite material , biochemistry , physics , quantum mechanics
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.