Journal
JOURNAL OF APPLIED PHYSICS
Volume 87, Issue 9, Pages 4340-4343Publisher
AMER INST PHYSICS
DOI: 10.1063/1.373413
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We present a study of controlled n-type doping in molecular organic semiconductors: Naphthalenetetracarboxylic dianhydride is doped by cosublimation with the donor molecule bis(ethylenedithio)-tetrathiafulvalene. Electrical parameters are deduced from temperature-dependent measurements of the conductivity and the thermopower for various dopant concentrations. The results are compared to the predictions of a standard model commonly used for crystalline semiconductors. The Fermi level shifts towards the transport level, the conductivity is increased, and the mobility decreases with the doping ratio. (C) 2000 American Institute of Physics. [S0021-8979(00)00607-1].
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