The Mobility of Charge Carriersin Molecularly Doped Polymer Films with Various Thicknesses

摘要

The dependence of the mobility of charge carriers in molecularly doped polycarbonate on thethickness of the polymer was studied at two dopant DEH concentrations (30 and 50 wt %). The mobilityof holes in the more concentrated polymer did decrease as the film thickness increased in close agreementwith the predictions of the theory of weakly nonequilibrium transport with a dispersion parameter of 0.75.For films with a lower dopant concentration, such a categorical statement cannot be made, because mobil-ity can either decrease as the film thickness increases or remain almost unchanged depending on themethod for data processing. For this reason, it is not recommended to use the dependence of the time offlight on film thickness as a criterion for selecting the mechanism of the transport of charge carriers inmolecularly doped polymers.