Temperature dependence of Ge2Sb2Te5conductivity and its change during aging

Abstract

Results of studies of conductivity activation energy and its evolution during the aging process are presented for the common phase change material Ge2Sb2Te5. The evolution of temperature dependence of conductivity during quasi-isothermal annealing are interpreted in the framework of simple Arrhenius model as the change of two corresponding parameters: activation energy and pre-exponential factor. It is shown, that the change in resistivity of the Ge2Sb2Te5 during aging is attributed to the simultaneous change of both parameters of the Arrhenius equation, that is, activation energy and pre-exponential factor. Temperature dependencies of those parameters are shown as well, and the Meyer-Neldel rule for conductivity of Ge2Sb2Te5 is tested on the basis of the obtained data.