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Charge transport in amorphous semiconductors having spatially correlatedexponential density of states (DOS) has been considered for the arbitrarybehavior of the correlation function of random energies. Average carriervelocity is exactly calculated for the quasi-equilibrium (nondispersive)transport regime. For the symmetric exponential DOS with exponential tails forlow and high energies and non-positive correlation function the temperature forthe transition to the dispersive transport regime depends on correlationproperties and becomes greater than the traditional estimation based on the DOSdecay energy $kT=U_0$. Another new feature of the transport in the landscapehaving non-positive correlation function is the decay of the mobility withfield in low field region.

Charge transport in the spatially correlated exponential random energy landscape: effect of the non-positive correlation function