The speed limit for sequential charge hopping in molecular materials

Elementary arguments are used to show that there is a maximum charge mobility that can be described by sequential hopping between molecules and that this maximum mobility can be expressed in terms of physical quantities that are all experimentally accessible. The evaluation of the maximum hopping mobility with realistic parameters suggests that sequential charge hopping is not the correct transport mechanism for the best molecular materials used for organic transistors. (C) 2011 Elsevier B. V. All rights reserved.