DC electronic transport in binary arsenic chalcogenide glasses

dc conductivity and Seebeck measurements have been carried out at temperatures below T_g on well characterized bulk samples of amorphous As₂Te₃, As₂Se₃, and As₂S₃. Several models for conduction in these materials have been compared to the data. It is concluded that the models involving polaron hopping conduction are in better agreement with available data than are models involving hopping in the tails of localized band-tail states.