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Structural Evolution of Amorphous Ge2Sb2Te5 Thin Films in the Transition to the Crystalline Phase

Published online by Cambridge University Press:  01 February 2011

Riccardo De Bastiani ,
Alberto Maria Piro ,
Maria Grazia Grimaldi ,
Emanuele Rimini ,
Giuseppe Baratta  and
Giovanni Strazzulla
Riccardo De Bastiani
Affiliation:
riccardo.debastiani@ct.infn.it, Università di Catania and MATIS CNR-INFM, Dipartimento di Fisica ed Astronomia, 64 via S. Sofia, I-95123 Catania, Italy, Catania, 95123, Italy, +390953785289
Alberto Maria Piro
Affiliation:
alberto.piro@ct.infn.it, Università di Catania and MATIS CNR-INFM, Dipartimento di Fisica ed Astronomia, 64 via S. Sofia, Catania, 95123, Italy
Maria Grazia Grimaldi
Affiliation:
mariagrazia.grimaldi@ct.infn.it, Università di Catania and MATIS CNR-INFM, Dipartimento di Fisica ed Astronomia, 64 via S. Sofia, Catania, 95123, Italy
Emanuele Rimini
Affiliation:
emanuele.rimini@ct.infn.it, Università di Catania and CNR-IMM, Dipartimento di Fisica ed Astronomia, 64 via S. Sofia, Catania, 95123, Italy
Giuseppe Baratta
Affiliation:
gba@oact.inaf.it, INAF, Osservatorio Astrofisico di Catania, via S. Sofia 78, Catania, 95123, Italy
Giovanni Strazzulla
Affiliation:
gianni@oact.inaf.it, INAF, Osservatorio Astrofisico di Catania, via S. Sofia 78, Catania, 95123, Italy
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Abstract

The crystallization kinetics of as-deposited amorphous Ge2Sb2Te5 thin films has been measured by in situ time resolved reflectivity. X-ray diffraction and Raman scattering analyses of partially transformed samples allowed to correlate the evolution of the transition to the structural modification in the long and short range configuration. The experimental results evidenced that during the early stages of crystallization there is a reduction of Ge-Te tetrahedral bonds, characteristics of the Ge coordination in amorphous Ge2Sb2Te5 films.

Keywords

phase transformationx-ray diffraction (XRD)Raman spectroscopy
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1072: Symposium G – Phase-Change Materials for Reconfigurable Electronics and Memory Applications , 2008 , 1072-G02-05
Copyright
Copyright © Materials Research Society 2008

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References

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