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Type: 
Journal
Description: 
We experimentally investigate the isothermal amorphous-to-fcc polycrystalline phase transition process in amorphous Ge2Sb2Te5 thin films prepared by sputtering. The amorphous layers were either as deposited or formed by Ar+ ion implantation after crystallization at 300 °C. The kinetics of the amorphous-to-polycrystal transition are analyzed through electrical measurements, in which the Johnson–Mehl–Avrami–Kolmogorov theory is employed. The procedure to extract the kinetics of the phase transition from conductivity versus time data is carefully discussed and compared to data of cross-sectional transmission electron microscopy images versus anneal time. By following this proposed procedure, the nucleation and growth parameters, and the activation energies have been determined. Results indicate that the process of isothermal crystallization in Ge2Sb2Te5 takes place in two stages, in which the Avrami …
Publisher: 
AIP
Publication date: 
15 Apr 2009
Authors: 

Pietro La Fata, Felice Torrisi, Salvatore Lombardo, Giuseppe Nicotra, Rosaria Puglisi, Emanuele Rimini

Biblio References: 
Volume: 105 Issue: 8 Pages: 083546
Origin: 
Journal of Applied Physics