Extended Gaussian disorder model

Fig. 8 Temperature dependence of the zero field hole mobility in the low carrier density limit in a polyfluorene copolymer. The data are inferred from space-charge-limited current experiments and analyzed in terms of the extended Gaussian disorder model (see Sect. 4.1). From [90] with permission. Copyright (2008) by the American Institute of Physics...

Despite the considerable success of Eq. (7) in consistently rationalizing mobility data in many systems, the Gaussian Disorder Model misses the mark in one major way. The field-strength [E) dependence predicted for a realistic value of d (3.0, approximately the smallest a ever encountered in practice) and various values of E is shown in Figure 39 [63a,b]. Only for strong fields (sometimes only above 10 V cm ) are the results adequately described as linear functions of whereas experimentally this linearity usually extends to the lowest values of E accessible (sometimes as low as lO V cm ) [60b, 63c,d]. It was initially proposed that the... 

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