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Simulations of charge transport in amorphous semiconductors are oftenperformed in microscopically sized systems. As a result, charge carriermobilities become system-size dependent. We propose a simple method forextrapolating a macroscopic, nondispersive mobility from the system-sizedependence of a microscopic one. The method is validated against atemperature-based extrapolation [Phys. Rev. B 82, 193202 (2010)]. In addition,we provide an analytic estimate of system sizes required to performnondispersive charge transport simulations in systems with finite chargecarrier density, derived from a truncated Gaussian distribution. This estimateis not limited to lattice models or specific rate expressions.

Finite-Size Scaling of Charge Carrier Mobility in Disordered Organic Semiconductors