Phase Separation in Cubic Group-III Nitride Alloys

✍ Scribed by Scolfaro, L.M.R.

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 155 KB
• Volume: 190
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/1521-396x(200203)190:1<15::aid-pssa15>3.0.co;2-a

✦ Synopsis

The thermodynamic properties of cubic group-III nitride ternary alloys In x Ga 1Àx N, In x Al 1Àx N, B x Ga 1Àx N, and B x Al 1Àx N have been studied through first principles total energy calculations combined with a cluster expansion method within the generalized quasi-chemical approach to disorder and composition effects. Focus will be given on the phase diagrams T versus x of the alloys. The interplay of miscibility gap and strain influence is analyzed. In particular for In x Ga 1Àx N, the calculations carried out here are used to investigate the origin of the light emission process in the InGaN-based optoelectronic devices through a comparison with recent high resolution X-ray and Raman spectroscopy measurements.