Critical thickness for transformation of epitaxially stabilized cubic AlN in superlattices

  • Kim I
  • Li Q
  • Marks L
 et al. 
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The epitaxial stabilization and transformation of cubic AlN layers in AlN/VN and AlN/TiN superlattices, grown by reactive sputtering on MgO (001), is described. In AlN/VN, the critical AlN thickness lC for transformation from cubic to hexagonal increased from ˜3.0 to >4 nm when the VN superlattice layer thickness was increased from 2.0 to 6.0 nm. The effect of lattice mismatch was observed by comparing AlN/VN (mismatch= 1.46%) and AlN/TiN (mismatch = 3.84%). The lC values were smaller, 2-2.5 nm, for the larger mismatch AlN/TiN system. The dependence of lC on the lattice mismatch and stabilizing layer thickness is discussed based on models of epitaxial stabilization. © 2001 American Institute of Physics.

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