Local Bonding Arrangements in Amorphous Ge2Sb2Te5: The Importance of GE and TE Bonding
Final rept. 1 Aug 2003-5 Dec 2006
NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF PHYSICS
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Studies of amorphous a- semiconductors have been driven by technological advances as well as fundamental theories. Observation of electrical switching, for example, fueled early interest in a-chalcogenides. More recently a-chalcogenides switching has been applied successfully to programmable memory devices, as well as DVD technology where the quest for the discovery of better-suited materials continues. Thus, switching grants researchers today with an active arena of technological as well as fundamental study. Bond constraint theory and rigidity theory provided a powerful framework for understanding the structure and properties of a-materials. Application of these theories to switching in a-chalcogenides holds the promise of finding the best composition suited for switching applications. Extended X-ray Absorption Fine Structure EXAFS spectroscopy is an ideally suited technique to investigate the switching properties of these materials. Results of previous EXAFS experiments are presented and viewed through the lens of bond constraint theory and rigidity theory.
- Physical Chemistry
- Electrical and Electronic Equipment
- Ceramics, Refractories and Glass