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Published in: Journal of Materials Science 10/2022

03-03-2022 | Electronic materials

Effect of Co, Pd and Pt ultra-thin films on the Ni-silicide formation: investigating the sandwich configuration

Authors: Khalid Quertite, Jianbao Gao, Marion Descoins, Maxime Bertoglio, Christophe Girardeaux, Dominique Mangelinck

Published in: Journal of Materials Science | Issue 10/2022

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Abstract

The effect of Co, Pd and Pt ultrathin films on the kinetics of the formation of Ni-silicide by reactive diffusion is investigated. 50 nm Ni/1 nm X/ 50 nm Ni (X = Co, Pd, Pt) deposited on Si(100) substrates are studied using in-situ and ex-situ measurements by X-ray diffraction (XRD). The presence of Co, Pd or Pt thin films in between the Ni layers delays the formation of the metal rich phase compared to the pure Ni/Si system and thus these films act as diffusion barriers. A simultaneous silicide formation (δ-Ni2Si and NiSi phases) different from the classic sequential formation is found during the consumption of the top Ni layer for which Ni has to diffuse through the barrier. A model for the simultaneous growth in the presence of a barrier is developed, and simulation of the kinetics measured by XRD is used to determine the permeability of the different barriers. Atom probe tomography (APT) of the Ni/Pd/Ni system shows that the Pd layer is located between the Ni top layer and δ-Ni2Si during the silicide growth, in accordance with a silicide formation controlled by Ni diffusion through the Pd layer. The effect of the barrier on the silicide formation and properties is discussed.

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Metadata
Title
Effect of Co, Pd and Pt ultra-thin films on the Ni-silicide formation: investigating the sandwich configuration
Authors
Khalid Quertite
Jianbao Gao
Marion Descoins
Maxime Bertoglio
Christophe Girardeaux
Dominique Mangelinck
Publication date
03-03-2022
Publisher
Springer US
Published in
Journal of Materials Science / Issue 10/2022
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-022-07012-2

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