Observation of hexagonal nuclei in the once melt-quenched Ge2 Sb2 Te5 phase change contact dimensions

Min Soo Youm, Yong Tae Kim, Man Young Sung

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Abstract

The microstructures of once melt-quenched Ge2 Sb2 Te5 (GST) phase change contact dimensions are directly investigated with high resolution transmission electron microscopy (HR-TEM) by applying reset pulse of 7-13 V. The ovonic threshold switching voltage is decreased from 4.1 to 2.8 V when the as-deposited GST cells are once melt quenched by 10 V. HR-TEM reveals that there are hexagonal nuclei in the once melt-quenched GST and the GST can be partially left in not the amorphous but the crystalline state when the molten GST is not swiftly quenched, which is an origin of the switching failure.

Original languageEnglish
Article number083508
JournalApplied Physics Letters
Volume91
Issue number8
DOIs
Publication statusPublished - 2007 Aug 31
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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