Published online by Cambridge University Press: 26 February 2011
Firstly, a general discussion on the crystallization of amorphous multilayer structures is presented from the viewpoints of thermodynamics, where both a nature of the heterointerface and a repeat distance of the layer are theoretically shown to be key factors for determining the crystallization temperature (Tc). Secondly, experimental observations are described of the effect of each layer thickness and the heterointerface on the structural stability of reactively-sputtered a-Ge:H(a-Ge)/a-GeNx multilayer films. It is demonstrated that Tc of a-Ge:H(a-Ge) increases with decreasing its layer thickness and/or increasing the thickness of a-GeNx layer, which is interpreted qualitatively within the framework of the macroscopic thermodynamics. Relevant phenomena observed by other groups as well as the present results are discussed in a unified manner.