Atomic intermixing and interface roughness in short-period InAs/GaSb superlattices for infrared photodetectors

A set of advanced characterization methods, including high-resolution X-ray diffraction (measurements and simulations), cross-sectional scanning tunneling microscopy, and high-angle annular dark-field scanning transmission electron microscopy is applied to quantify the interface roughness and atomic...

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Veröffentlicht in:Journal of applied physics 2014-09, Vol.116 (12)
Hauptverfasser: Ashuach, Y., Lakin, E., Saguy, C., Kaufmann, Y., Zolotoyabko, E.
Format: Artikel
Sprache:eng
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Zusammenfassung:A set of advanced characterization methods, including high-resolution X-ray diffraction (measurements and simulations), cross-sectional scanning tunneling microscopy, and high-angle annular dark-field scanning transmission electron microscopy is applied to quantify the interface roughness and atomic intermixing (in both cation and anion sub-lattices) in short period (6–7 nm) InAs/GaSb superlattices intended for mid-wavelength (M) and long-wavelength (L) infrared detectors. The undesired atomic intermixing and interface roughness in the L-samples were found to be considerably lower than in the M-samples. In all specimens, anion intermixing is much higher than that in the cation sub-lattice. Possible origins of these findings are discussed.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4896834