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General properties of the hopping transport of charge carriers in amorphousorganic and inorganic materials are discussed. We consider the case where therandom energy landscape in the materials is strongly spatially correlated. Thisis a very typical situation in the organic materials having the Gaussiandensity of states (DOS) and may be realized in some materials with theexponential DOS. We demonstrate that the different type of DOS leads to a verydifferent functional form of the mobility field dependence even in the case ofthe identical correlation function of random energy. We provide importantarguments in favor of the significant contribution of the local orientationalorder to the total magnitude of the energetic disorder in organic materials. Asimple but promising model of charge transport in highly anisotropic compositesmaterials is suggested.

Hopping charge transport in amorphous organic and inorganic materials with spatially correlated random energy landscape