Abstract
We study numerically the energy distribution of electrons and the hopping conductivity as a function of the temperature T and electric field E in the tail of the density of states of an amorphous semiconductor where states are localized with a localization length a. We find a Boltzmann distribution with an effective temperature (T,E) which in the limit of eEa≫T is close to 0.67eEa/. The conductivity σ(T,E) collapses to a single universal curve when plotted as a function of the effective temperature (T,E). This confirms the fact that determines the conductivity. The same effective temperature also determines the dependencies of the steady state and transient photoconductivities on T and E.
- Received 6 July 1992
DOI:https://doi.org/10.1103/PhysRevB.46.13100
©1992 American Physical Society