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 tha t 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 viny lene) and in mobility data reported in literature. Surprisingly, the charac teristic Meyer-Neldel energy for all analyzed. materials is close to 40 meV . Possible implications for the charge transport mechanism in these materia ls are discussed. (C) 2000 American Institute of Physics. [S0003-6951(00)02 323-8].