The Meyer-Neldel rule in organic thin-film transistors

We have measured and analyzed the temperature and gate voltage dependencies of the field-effect mobility in organic thin-film transistors. We find that the mobility prefactor increases exponentially with the activation energy in agreement with the Meyer-Neldel rule. This behavior is demonstrated in the mobility data of solution-processed pentacene, poly(2,5-thienylene vinylene) and in mobility data reported in literature. Surprisingly, the characteristic Meyer-Neldel energy for all analyzed. materials is close to 40 meV. Possible implications for the charge transport mechanism in these materials are discussed. (C) 2000 American Institute of Physics. [S0003-6951(00)02323-8].