Enhancing silicide formation in Ni/Si(111) by Ag-Si particles at the interface

Cheng Hsun Tony Chang, Pei Cheng Jiang, Yu Ting Chow, Hsi Lien Hsiao, Wei Bin Su, Jyh Shen Tsay

Research output: Contribution to journalArticle

Abstract

Compound formation at a metal/semiconductor interface plays crucial roles in the properties of many material systems. Applications of Ni silicides span numerous areas and have the potential to be used as new functionalities. However, the magnetic properties of ultrathin Ni layers on silicon surfaces and related chemical compositions at the interface are not fully understood and the influence of Ag additives on the reactivity of Ni/Si(111) remain unclear. We report herein on the fact that the dominant species produced at the interface is NiSi, which is produced by the spontaneous formation of strong bonds between Ni and Si atoms. Assuming that a Ni layer is formed over a NiSi layer with the total coverage as a constraint, we established a chemical shift-related concentration model that, in effect, represents a practical method for determining the amount of ultrathin Ni silicides that are produced at the buried interface. The formation of Ag-Si particles provide a viable strategy for enhancing silicide formation via a specific interaction transfer mechanism, even at room temperature. The mechanism is related to differences in the enthalpies of formation ΔHAg-Si, ΔHNi-Ag, and ΔHNi-Si, for these phases and provides insights into strategies for producing ultrathin silicides at a buried interface.

Original languageEnglish
Article number8835
JournalScientific Reports
Volume9
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1

ASJC Scopus subject areas

  • General

Fingerprint Dive into the research topics of 'Enhancing silicide formation in Ni/Si(111) by Ag-Si particles at the interface'. Together they form a unique fingerprint.

  • Cite this