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 semic lassical hopping rates with respect to the possible widths and possibl e positions of the large polaron during the jump. For sufficient long chains and high enough fields, we arrive at an expression for the mobi lity which resembles a Fowler-Nordheim dependence with the field F, na mely, exp - (F-0/F) In this regime the mobility is weakly temperature dependent.