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The archival life of phase-change memories (PCM) is determined by the thermal stability of amorphous phase in a crystalline matrix. In this paper, we report the effect of ion beam irradiation on the crystallization kinetics of amorphous Ge2Sb2Te5 alloy (GST). The transition rate of amorphous GST films was measured by in situ time resolved reflectivity (TRR). The amorphous to crystal transformation time decreases considerably in irradiated amorphous GST samples when ion fluence increases. The stability of amorphous Ge2Sb2Te5 thin films subjected to ion irradiation is discussed in terms of the free energy variation of the amorphous state because of damage accumulation.
Publication date: 
1 May 2008

R De Bastiani, AM Piro, I Crupi, MG Grimaldi, E Rimini

Biblio References: 
Volume: 266 Issue: 10 Pages: 2511-2514
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms