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Title: Unusual crystallization behavior in Ga-Sb phase change alloys

Combined in situ X-ray scattering techniques using synchrotron radiation were applied to investigate the crystallization behavior of Sb-rich Ga-Sb alloys. Measurements of the sheet resistance during heating indicated a reduced crystallization temperature with increased Sb content, which was confirmed by in situ X-ray diffraction. The electrical contrast increased with increasing Sb content and the resistivities in both the amorphous and crystalline phases decreased. It was found that by tuning the composition between Ga:Sb = 9:91 (in at.%) and Ga:Sb = 45:55, the change in mass density upon crystallization changes from an increase in mass density which is typical for most phase change materials to a decrease in mass density. At the composition of Ga:Sb = 30:70, no mass density change is observed which should be very beneficial for phase change random access memory (PCRAM) applications where a change in mass density during cycling is assumed to cause void formation and PCRAM device failure.
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [4]
  1. Aix-Marseille Université, IM2NP, Campus de Saint-Jérôme, F-13397 Marseille (France)
  2. (France)
  3. Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden (Germany)
  4. IBM/Macronix PCRAM Joint Project, IBM T. J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598 (United States)
Publication Date:
OSTI Identifier:
22269582
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL Materials; Journal Volume: 1; Journal Issue: 6; Other Information: (c) 2013 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; CRYSTALLIZATION; DENSITY; FAILURES; HEATING; PHASE CHANGE MATERIALS; SYNCHROTRON RADIATION; X-RAY DIFFRACTION