Published online by Cambridge University Press: 16 February 2011
The low temperature thermally stimulated conductivity (TSC) in a-Si:H film has been investigated in the temperature range from 20 to 150 K. Unlike the results of the high temperature TSC, the low temperature peak value and position (T m ) of TSC do not depend on the starting temperature T0 at low temperatures. This new phenomenon can not be explained by TSC theory [1]. Based on the multiple trapping (MT) Model, TSC theory limits its application to the intermediate and high temperature range. In this paper, a model of the hopping conduction with the transport energy E t in the band tail is proposed to understand the behavior of the low temperature TSC in which the thermal emission energy E m does not depend on the starting temperature of TSC.