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The probability of finding In–N and N–N closely spaced pairs in In x Ga 1− x As 1− y N y∕ Ga As quasi-lattice-matched quantum wells (x= 0.13, y= 0.045) has been measured by cross-sectional scanning tunneling microscopy. The average number of In–N bonds is higher than expected for a random distribution in both as-grown and annealed samples, but lower than that predicted by current theoretical calculations. Our measurements show no N outdiffusion and little change in the spatial distribution of In atoms as a result of annealing. However, a remarkable decrease in the number of N–N nearest neighbors and associated localized states is observed in annealed quantum wells.
American Physical Society
Publication date: 
3 Aug 2005

R Duca, G Ceballos, C Nacci, D Furlanetto, P Finetti, S Modesti, A Cristofoli, G Bais, M Piccin, S Rubini, F Martelli, A Franciosi

Biblio References: 
Volume: 72 Issue: 7 Pages: 075311
Physical Review B