MOCVD growth and annealing characteristics of Mg-doped AlGaN films
2008
We investigate the growth of Mg doped Al x Ga 1-x N films grown by metal organic chemical vapor deposition (MOCVD).
The high temperature AlN interlayer can improve the quality of films, reducing the density of dislocations. With the
increase of Al composition, the quality of films dramatically decreases, and a large number of island-shaped crystal
nuclei can be observed, for three-dimensional growth mode of Mg-doped Al x Ga 1-x N can not be transformed into two-dimensional
mode easily. Both the increase of Al composition and Cp 2 Mg flux can increase the density of screw
dislocations. The increase of Cp 2 Mg flux can considerably increase the density of edge dislocations, while the increasing
Al composition has little impact on the density of edge dislocations. Finally, annealing at 900°C for 15 minutes after
growth is the ideal annealing condition for obtaining p-type Al 0.2 Ga 0.8 N, with hole concentration of 1.0×10 17 cm -3 .
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