Doped a-Si H below the equilibration temperature

The electronic structure is frozen below the equilibration temperature and the density of electrons is constant. The second term in Eq. (7.18) is therefore zero and the statistical shift of the Fermi 

The effect of the statistical shift can be calculated from Eq. (7.18) and the density of states distribution, just as for the equilibrium state except that the density of electrons is now constant. The resulting values of Yp are in the range 3k-6k, so that the correction to the prefactor of exp(Yp/ ) from the statistical shift is a factor of 10-100. The calculated conductivity is shown in Fig. 7.5 and a good fit to the data is found with a conductivity prefactor of 100 cm and the same transport energy as was obtained from the analysis of the equilibrium regime. The modeling of the conductivity therefore shows that the only difference 

Assume that the conductivity of an undoped a-Si H sample is o, at the measurement temperature of T. If the temperature dependence of o T) reveals an activated behaviour near then 

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