Equilibrium limits of coherency in strained nanowire heterostructures

DOI PDF 被引用文献23件
  • Elif Ertekin
    University of California Department of Materials Science and Engineering, 210 Hearst Memorial Mining Building, , Berkeley, California 94720-1760 and Materials Sciences Division, 1 Cyclotron Road, M.S. 66, , Berkeley, California
  • P. A. Greaney
    University of California Department of Materials Science and Engineering, 210 Hearst Memorial Mining Building, , Berkeley, California 94720-1760 and Materials Sciences Division, 1 Cyclotron Road, M.S. 66, , Berkeley, California
  • D. C. Chrzan
    University of California Department of Materials Science and Engineering, 210 Hearst Memorial Mining Building, , Berkeley, California 94720-1760 and Materials Sciences Division, 1 Cyclotron Road, M.S. 66, , Berkeley, California
  • Timothy D. Sands
    Purdue University School of Materials Engineering, School of Electrical and Computer Engineering, and Birck Nanotechnology Center, 501 Northwestern Avenue, , West Lafayette, Indiana 47907-2044

書誌事項

公開日
2005-06-01
DOI
  • 10.1063/1.1903106
公開者
AIP Publishing

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説明

<jats:p>Due to their unique boundary conditions, nanowire heterostructures may exhibit defect-free interfaces even for systems with large lattice mismatch. Heteroepitaxial material integration is limited by lattice mismatches in planar systems, but we use a variational approach to show that nanowire heterostructures are more effective at relieving mismatch strain coherently. This is an equilibrium model based on the Matthews critical thickness in which the lattice mismatch strain is shared by the nanowire overlayer and underlayer, and could as well be partially accomodated by the introduction of a pair of misfit dislocations. The model is highly portable to other nanowire material systems and can be used to estimate critical feature sizes. We find that the critical radius of this system is roughly an order of magnitude larger than the critical thickness of the corresponding thin film/substrate material system. Finite element analysis is used to assess some aspects of the model; in particular, to show that the variational approach describes well the decay of the strain energy density away from the interface.</jats:p>

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