The effect of InxGa1-xN back-barriers on the dislocation densities in Al0.31Ga0.69N/AlN/GaN/InxGa1-xN/GaN heterostructures (0.05 <= x <= 0.14)


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Sarikavak-Lisesivdin B. , Lisesivdin S. B. , Ozbay E.

CURRENT APPLIED PHYSICS, cilt.13, sa.1, ss.224-227, 2013 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 13 Konu: 1
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1016/j.cap.2012.07.012
  • Dergi Adı: CURRENT APPLIED PHYSICS
  • Sayfa Sayıları: ss.224-227

Özet

Al0.31Ga0.69N/AlN/GaN/InxGa1-xN/GaN heterostructures grown with the metal-organic chemical vapor deposition (MOCVD) technique with different InxGa1-xN back-barriers with In mole fractions of 0.05 <= x <= 0.14 were investigated by using XRD measurements. Screw, edge, and total dislocations, In mole fraction of back-barriers, Al mole fraction, and the thicknesses of front-barriers and lattice parameters were calculated. Mixed state dislocations with both edge and screw type dislocations were observed. The effects of the In mole fraction difference in the back-barrier and the effect of the thickness of front-barrier on crystal quality are discussed. With the increasing In mole fraction, an increasing dislocation trend is observed that may be due to the growth temperature difference between ultrathin InxGa1-xN back-barrier and the surrounding layers. (C) 2012 Elsevier B.V. All rights reserved.