Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10716757 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2005 | 6 Pages |
Abstract
EXAFS spectra of AIIIBv heterostructures have been measured at the European Synchrotron Radiation Facility (ESRF, Grenoble, France), DUBBLE beam-line. It has been found that the first shell RGaâN interatomic distance in heterostructure GaN/AlN is equal to 1.91Â Ã
, which is 0.04Â Ã
smaller compared to crystalline GaN. For the second Ga-Ga shell an interatomic distance RGaâGa of 3.13Â Ã
was found, which is 0.06Â Ã
smaller than in crystalline GaN. The coordination number NGaâGa was found to be 6.0. Our results suggest that this heterostructure with discrete electronic spectra contains two-dimentional islands with strong elastic strains. The first shell interatomic distance RInâAs for the heterostructure containing InAs quantum dots (QDs) is 0.04Â Ã
lower in comparison with those for the bulk InAs and is 2.58Â Ã
. The second shell interatomic distance RInâIn is 3.99Â Ã
, i.e. 0.29Â Ã
smaller compared to the bulk InAs. The Debye-Waller factor was found to be 0.022Â Ã
2, the coordination number NInâInâ¼2.0. The results obtained suggest that InAs/AlAs heterostructure with discrete electronic spectra contains three-dimentional islands with unhomogeneity of microstructure due to elastic strain relaxation.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Instrumentation
Authors
S.B. Erenburg, N.V. Bausk, L.N. Mazalov, A.I. Toropov, K.S. Zhuravlev, V.G. Mansurov, T.S. Shamirsaev, W. Bras, S. Nikitenko,