On the temperature dependence of the hopping thermopower in disordered   semiconductors
  At low temperature using thermodynamics of irreversible processes the general expressions for the temperature dependence of the thermopower in the case of the hopping conductivity for disordered materials are found. The account of influence of impurity levels degeneration on the thermopower is lead. In a view of received results experimental data of the thermopower in amorphous and impurity semiconductors are discussed. 
O. E. Parfenov and F. A. Shklyaruk