Crystallization behavior of as-deposited, melt quenched, and primed amorphous states of Ge2Sb2.3Te5 films

We compare the crystallization behavior of thin films of Ge2Sb2.3Te5 in various amorphous states, namely, as-deposited, melt-quenched, and primed. These films are embedded in a quadrilayer stack similar in structure to the commercially available phase-change optical disks. This study shows that the melt-quenched amorphous film has a shorter crystallization onset time and a higher crystallization rate in comparison to the as-deposited amorphous film. We also observed that variable priming leads to crystallization behavior falling between that of the as-deposited and melt-quenched states. A qualitative model of the modification in crystallization behavior due to priming is given based on the notion that priming produces crystalline embryos which hastens crystallization process.

[1]  M Mansuripur,et al.  Measurement of the thermal conductivity of erasable phase-change optical recording media. , 2000, Applied optics.

[2]  J W Goodman,et al.  Laser-induced local heating of multilayers. , 1982, Applied optics.

[3]  M Mansuripur,et al.  Crystallization and amorphization studies of a Ge(2)Sb(2.3)Te(5) thin-film sample under pulsed laser irradiation. , 2000, Applied optics.

[4]  N. Yamada,et al.  Rapid‐phase transitions of GeTe‐Sb2Te3 pseudobinary amorphous thin films for an optical disk memory , 1991 .

[5]  C. Peng,et al.  Experimental and theoretical investigations of laser-induced crystallization and amorphization in phase-change optical recording media , 1997 .

[6]  J. Frankel.  Kinetic theory of liquids , 1946 .

[7]  M Mansuripur,et al.  Laser-induced local heating of moving multilayer media. , 1983, Applied optics.

[8]  M Mansuripur,et al.  Static tester for characterization of phase-change, dye-polymer, and magneto-optical media for optical data storage. , 1999, Applied optics.

[9]  J. E. McDonald,et al.  Homogeneous Nucleation of Vapor Condensation. II. Kinetic Aspects , 1963 .

[10]  James E. McDonald,et al.  Homogeneous Nucleation of Vapor Condensation. I. Thermodynamic Aspects , 1962 .

[11]  Kenichi Nishiuchi,et al.  High-density recording on phase-change optical disks , 1995, Other Conferences.

[12]  T. Ohta,et al.  Overwritable phase-change optical disk recording , 1998 .

[13]  J. H. Coombs,et al.  Laser‐induced crystallization phenomena in GeTe‐based alloys. I. Characterization of nucleation and growth , 1995 .

[14]  F. Farley.  The theory of the condensation of supersaturated ion-free vapour , 1952, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.