Structural transition and enhanced phase transition properties of Se doped Ge2Sb2Te5 alloys


Autoria(s): Vinod, EM; Ramesh, K; Sangunni, KS
Data(s)

2015

Resumo

Amorphous Ge2Sb2Te5 (GST) alloy, upon heating crystallize to a metastable NaCl structure around 150 degrees C and then to a stable hexagonal structure at high temperatures (>= 250 degrees C). It has been generally understood that the phase change takes place between amorphous and the metastable NaCl structure and not between the amorphous and the stable hexagonal phase. In the present work, it is observed that the thermally evaporated (GST)(1-x)Se-x thin films (0 <= x <= 0.50) crystallize directly to the stable hexagonal structure for x >= 0.10, when annealed at temperatures >= 150 degrees C. The intermediate NaCl structure has been observed only for x, 0.10. Chemically ordered network of GST is largely modified for x >= 0.10. Resistance, thermal stability and threshold voltage of the films are found to increase with the increase of Se. The contrast in electrical resistivity between the amorphous and crystalline phases is about 6 orders of magnitude. The increase in Se shifts the absorption edge to lower wavelength and the band gap widens from 0.63 to 1.05 eV. Higher resistance ratio, higher crystallization temperature, direct transition to the stable phase indicate that (GST)(1-x)Se-x films are better candidates for phase change memory applications.

Formato

application/pdf

Identificador

http://eprints.iisc.ernet.in/50941/1/sci_rep_5_2015.pdf

Vinod, EM and Ramesh, K and Sangunni, KS (2015) Structural transition and enhanced phase transition properties of Se doped Ge2Sb2Te5 alloys. In: SCIENTIFIC REPORTS, 5 .

Publicador

NATURE PUBLISHING GROUP

Relação

http://dx.doi.org/ 10.1038/srep08050

http://eprints.iisc.ernet.in/50941/

Palavras-Chave #Physics
Tipo

Journal Article

PeerReviewed