High-field mobility in an assembly of conjugated polymer segments

We present a calculation of the hopping rate between the finite chains of a conjugated polymer. It is based on the optimization of the semiclassical hopping rates with respect to the possible widths and possible positions of the large polaron during the jump. For sufficient long chains and high enough fields, we arrive at an expression for the mobility which resembles a Fowler-Nordheim dependence with the field F, namely, exp-(F₀/F). In this regime the mobility is weakly temperature dependent. {} 1996 The American Physical Society.