“…The attempts 13,16,17,[19][20][21] that have been made to explain a maximum or decreasing mobility for an increasing field 12,13,20,22,23 in disordered organic materials as an effect of Marcus theory and its inverted region have in many cases been abandoned in favor of the disorder model. 11,12,20,23,24 The common reason for this is that the parameters needed to fit the analytical expressions given by Eqs. (7) and (8) fall outside the interval of physically reasonable values and therefore, in many cases, the conclusions have been that polaron effects do not play an important role for charge transport in conjugated polymers.…”