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Title: First stage of CoSi{sub 2} formation during a solid-state reaction

The kinetics of CoSi{sub 2} formation via a solid-state reaction between CoSi and single crystal Si has been the object of many studies in the past. Because of the importance of nucleation, complex kinetics has been reported. In this work, we investigate CoSi{sub 2} formation kinetics with in-situ diffraction during isothermal annealing of CoSi films on Si (100). In-situ measurements allow capturing the initial stage of CoSi{sub 2} formation. An initial t{sup 3/2} time-dependent evolution is observed and attributed to 3D growth of individual nuclei. This first regime is followed after the coalescence of the nuclei by a classical parabolic t{sup 1/2} one-dimensional film growth. We evidence a marked influence of the initial Co thickness (50 nm vs 10 nm) on the growth kinetics. A significant slowdown of the CoSi{sub 2} formation kinetics is observed for the thinnest film, whereas the activation energy remains the same. These results shine a new light on the complex formation kinetics of CoSi{sub 2} during solid-state reaction between CoSi and single crystal silicon and bring new knowledge about what occurs in the ultra-thin film regime, which is important for nanotechnologies.
Authors:
 [1] ;  [2] ; ;  [1] ; ;  [3]
  1. CNRS, IM2NP (UMR 7334)—Faculté des Sciences, Aix-Marseille Université, Campus de Saint-Jérôme, Avenue Escadrille Normandie Niemen—Case 142, F-13397 Marseille Cedex (France)
  2. (France)
  3. STMicroelectronics, 190 Avenue Célestin Coq, 13106 Rousset (France)
Publication Date:
OSTI Identifier:
22399186
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 24; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACTIVATION ENERGY; ANNEALING; COALESCENCE; COBALT SILICIDES; DIFFRACTION; MONOCRYSTALS; NANOTECHNOLOGY; NUCLEATION; REACTION KINETICS; SILICON; SLOWING-DOWN; SOLIDS; THICKNESS; THIN FILMS; TIME DEPENDENCE; VISIBLE RADIATION