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Since this effect scales with eFa=s, the onset of saturation should occur at lower fields if the energetic disorder decreases. 3 Conceptual Frameworks: Polaronic Contribution to Transport So far we have disregarded polaronic effects. However, upon ionizing a molecule or a polymer chain by adding an extra electron there is a readjustment of bond lengths because the electron distribution changes. In optical transitions this effect is revealed by the coupling of the excitation to molecular vibrations.

In view of the extended range of the lnm vs F dependence, the data have been analyzed in terms of the correlated GMD model. Note that in their analysis the authors used a Poole–Frenkel-type of field 2 dependence in Child’s law for space-charge-limited current flow, jChild ¼ 98 ee0dmF . In this approach, the authors do not consider the modification of the mobility due to filling of tail states in the DOS (see Sect. 1). However, this modification to Child’s law is only justified if the field dependence of m is weak since a field dependent mobility has a feedback on the spatial distribution of the space charge [77, 78].

In this approach, the authors do not consider the modification of the mobility due to filling of tail states in the DOS (see Sect. 1). However, this modification to Child’s law is only justified if the field dependence of m is weak since a field dependent mobility has a feedback on the spatial distribution of the space charge [77, 78]. Under these circumstances there is no explicit solution for jChild(F) under spacecharge-limited conditions [79]. However, the essential conclusion relates to the absolute value of the hole mobility and the verification of the predicted temperature dependence.

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