TITLE

A model of threading dislocation density in strain-relaxed Ge and GaAs epitaxial films on Si (100)

AUTHOR(S)
Wang, G.; Loo, R.; Simoen, E.; Souriau, L.; Caymax, M.; Heyns, M. M.; Blanpain, B.
PUB. DATE
March 2009
SOURCE
Applied Physics Letters;3/9/2009, Vol. 94 Issue 10, pN.PAG
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Strain relaxation in large lattice-mismatched epitaxial films, such as Ge and III-V materials on Si, introduces high threading dislocation densities (TDDs). A thermodynamic model of TDD dependence on film thickness is developed. According to this model, the quasiequilibrium TDD of a given strain-relaxed film scales down with the inverse square of its thickness. The quasiequilibrium TDDs in both Ge and GaAs films follow this model consistently. Our model predicts the lowest possible TDD of a large lattice-mismatched film on Si (100), which is determined by the dislocation glide activation energy and the film thickness.
ACCESSION #
37043646

 

Related Articles

  • Controlled nucleation of dislocations by a spatially localized stress field. Kammler, M.; Chidambarrao, D.; Schwarz, K. W.; Black, C. T.; Ross, F. M. // Applied Physics Letters;9/26/2005, Vol. 87 Issue 13, p133116 

    We analyze the nucleation of dislocations in silicon at spatially localized stress fields generated by silicon nitride pads having a high intrinsic stress. The nucleation and final configuration of the dislocations were studied using hot-stage transmission electron microscopy and were compared...

  • Effective elastic constants in nonlinear elasticity. Bosher, S. H. B.; Dunstan, D. J. // Journal of Applied Physics;5/15/2005, Vol. 97 Issue 10, p10P305 

    The Lagrangian elastic constants cIJ and cIJK which are given in data-books are not stress-strain relationships. The relationships between them and any experimental observables are far from straightforward to evaluate under conditions of finite deformation when elasticity is nonlinear. We...

  • Time-resolved measurements of stress effects on solid-phase epitaxy of intrinsic and doped Si. Barvosa-Carter, W.; Aziz, M. J. // Applied Physics Letters;7/16/2001, Vol. 79 Issue 3 

    The effect of externally applied in-phase stresses on the solid-phase epitaxial growth rate of both intrinsic and B-doped Si has been measured using time-resolved reflectivity. The data are described phenomenologically by a product of a function of concentration, an Arrhenius function of...

  • Still states of bistable lattices, compatibility, and phase transition. Cherkaev, Andrej; Kouznetsov, Andrei; Panchenko, Alexander // Continuum Mechanics & Thermodynamics;Sep2010, Vol. 22 Issue 6-8, p421 

    We study a two-dimensional triangular lattice made of bistable rods. Each rod has two equilibrium lengths, and thus its energy has two equal minima. A rod undergoes a phase transition when its elongation exceeds a critical value. The lattice is subject to a homogeneous strain and is periodic...

  • Semi-circular surface cracks and flaking failures in silicon nitride bearings. Kida, Katsuyuki; Honda, Takashi; Santos, Edson Costa // Advanced Materials Letters;Nov2011, Vol. 2 Issue 5, p336 

    There is a well-known pattern of flaking failure under spherical ball-on-plate contact, i.e., the network between multiple Hertzian cracks causes the surface layer's separations. Based on this pattern previous researchers studied the failures of silicon nitride bearings. However, contrary to...

  • Nonlocal criteria for determining a prefracture zone in the process of defect growth for finite strains. Levin, V.; Morozov, E. // Doklady Physics;Jul2007, Vol. 52 Issue 7, p391 

    The article reports on the for creating a defect in elastic and viscoelastic bodies at finite strains. According to the author, the prefracture zone concept was used in the model. The material subjected to external loads change in the prefracture zone. The prefracture zone occurs when a certain...

  • Stability of deformation of isotropic hyperelastic bodies. Solodovnikov, V. N. // Journal of Applied Mechanics & Technical Physics;Nov/Dec2001, Vol. 42 Issue 6, p1043 

    The equations relating stress rates to strain rates are formulated and conditions of stable deformation of isotropic hyperelastic bodies are described. Stress–strain relations are presented for pure shear and uniaxial and axisymmetric loading of a material with a constitutive function...

  • On the stress function approach in three-dimensional elasticity. Bert�ti, E. // Acta Mechanica;Apr2007, Vol. 190 Issue 1-4, p197 

    Stress function-based solution procedures in elasticity require the knowledge of those stress functions that give zero complementary strain energy. In the two-dimensional case, the structure of the zero-energy first-order stress functions is as simple as that of the zero-energy displacements,...

  • Modeling of the Crack Tip Plastic Zone by Two Slip Lines and the Order of Stress Singularity. Kaminsky, Anatoly A.; Kipnis, Leonid A.; Dudik, Michael V. // International Journal of Fracture;May2004, Vol. 127 Issue 1, pl105 

    Modeling of initial plastic zone by two slip-lines is considered. It is shown that such a model does not remove stress singularity at the crack tip.

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics