Detection of N-Te bonds in the as-deposited amorphous nitrogen-doped GeTe-based phase change alloys using N K-edge XANES spectroscopy and their impact on crystallization

M. Krbal, A. V. Kolobov, P. Fons, K. V. Mitrofanov, Y. Tamenori, B. Hyot, B. Andre, J. Tominaga

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Using N K-edge XANES studies, we demonstrate a noticeable difference in local structure around the nitrogen atoms in as-deposited amorphous and annealed N-doped GeTe-based phase change alloys. The pronounced changes appear as a ≈ 2 eV shift in the absorption edge to higher photon energies and the overall shape of the XANES spectrum. Comparison of the experimental XANES spectrum of the as-deposited amorphous phase with ab-initio XANES simulations discloses that the as-deposited phase mainly consists of the NGe3and the NTe3pyramidal units in approximately equal concentration. When annealed, NTe3units gradually rebond to the NGe3units and at the same time N atoms diffuse through the amorphous phase to form the GexNyaggregates. Upon long-standing annealing at 400C a compact interlayer of Ge3N4is formed in the crystalline phase.

Original languageEnglish
Pages (from-to)254-259
Number of pages6
JournalJournal of Alloys and Compounds
Volume704
DOIs
Publication statusPublished - 2017 Jan 1
Externally publishedYes

Keywords

  • Local structure
  • Phase-change memory
  • X-ray absorption spectroscopy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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