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Investigation of Phase Transition in Stacked Ge-Chalcogenide/SnTe Phase-change Memory Films

  • Feiming Bai (a1), Surendra Gupta (a2), Archana Devasia (a3), Santosh Kurinec (a4), Morgan Davis (a5) and Kris A Campbell (a6)...

Abstract

Phase transitions in stacked GeTe/SnTe and Ge2Se3/SnTe thin layers for potential phase-change memory applications have been investigated by X-ray diffraction using a two-dimensional area detector system. The as-deposited underlying GeTe or Ge2Se3 layer is amorphous, whereas the top SnTe layer is crystalline. In the GeTe/SnTe stack, the crystallization of GeTe phase occurs near 170°C, and upon further heating, the GeTe phase disappears, followed by the formation of rocksalt-structured GexSn1−xTe solid solution. In the Ge2Se3/SnTe stack, the phase transition starts with the separation of a SnSe phase due to the migration of Sn ions into the Ge2Se3 layer. SnSe is believed to facilitate the crystallization of Ge2Se3-SnTe solid solution at ∼360°C, which is much lower than the crystallization temperature of Ge2Se3, therefore consuming less power during the phase transition.

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Keywords

Investigation of Phase Transition in Stacked Ge-Chalcogenide/SnTe Phase-change Memory Films

  • Feiming Bai (a1), Surendra Gupta (a2), Archana Devasia (a3), Santosh Kurinec (a4), Morgan Davis (a5) and Kris A Campbell (a6)...

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