MRS Proceedings

Table of Contents - Volume  482  - Symposium D – Nitride Semiconductors  

Editors : S.P. DenBaars, B.K. Meyer, S. Nakamura, F.A. Ponce, S. Strite


The core Structure Of Pure Edge Threading Dislocations In Gan Layers Grown On [0001] SiC Or Sapphire By Mbe

1997 MRS Fall Meeting.

P. Ruteranaa1, V. Potina1 and G. Noueta1

a1 Laboratoire d'Etudes et de Recherches sur les Matériaux, Institut des Sciences de la Mati~re et du Rayonnement, UPRESA-CNRS 6004, 6 Bd du Mardchal Juin 14050 Caen Cedex France,


The best layers of GaN grown on SiC or sapphire contain high densities of threading dislocations, which do not seem to exhibit a critically important electrical activity. It is possible that the electrical activity of these dislocations may change with time. The large majority of the threading dislocations are a type, with 1/3 <1120> Burgers vector and their line parallel to the [0001] growth direction. The atomic structure of the a threading dislocations was found to correspond to 5/7 or 8 atoms rings core with rather equal frequency. The 8 atoms ring cores contain dangling bonds and will present favourable sites for atomic impurities which eventuallly can modify the good performances of the devices.