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High transmittance contrast in amorphous to hexagonal phase of Ge2Sb2Te5: Reversible NIR-window.
- Source :
- Applied Physics Letters; 12/25/2017, Vol. 111 Issue 26, p1-4, 4p
- Publication Year :
- 2017
-
Abstract
- Ge<subscript>2</subscript>Sb<subscript>2</subscript>Te<subscript>5</subscript> (GST) is one of the best phase change materials because of its splendid set of properties, viz., high thermal stability, fast crystallization speed, good endurance, scalability, and reliability. Phase transition [amorphous → face centered cubic (fcc) → hexagonal close packed (hcp)] of GST thin films with annealing was studied using X-ray diffraction. Thin films in amorphous, fcc, and hcp phases are highly, medium, and negligible transparent in the near infra-red region, respectively. The optical transmission in amorphous, fcc, and hcp phases is ~92%, ~46%, and ~2%, respectively, at the wavelength of 2740 nm. At 2740 nm, a high transmission contrast (~90%) is observed with phase transition from the amorphous to hcp phase. By utilizing large transmission contrast, it is demonstrated that GST can be availed as a potential candidate for reversible near infra-red-window. The sharp change in optical transmission with phase transition can be understood from the change in density of states in the valence band. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 111
- Issue :
- 26
- Database :
- Complementary Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 127104568
- Full Text :
- https://doi.org/10.1063/1.5009610