temperature-dependent x-ray diffraction measurements of infrared superlattices grown by mbe
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2016
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Abstract
Strained-layer superlattices (SLSs) are an active research topic in the molecular beam epitaxy (MBE) and infrared focal plane array communities. These structures undergo a >500 K temperature change between deposition and operation. As a result, the lattice constants of the substrate and superlattice are expected to change by approximately 0.3%, and at approximately the same rate. However, we present the first temperature-dependent X-ray diffraction (XRD) measurements of SLS material on GaSb and show that the superlattice does not contract in the same manner as the substrate. In both InAs/InAs0.65Sb0.35 and In0.8Ga0.2As/InAs0.65Sb0.35 SLS structures, the apparent out-of-plane strain states of the superlattices switch from tensile at deposition to compressive at operation. These changes have ramifications for material characterization, defect generation, carrier lifetime, and overall device performance of superlattices grown by MBE.
| Reference Key |
reyner2016crystalstemperature-dependent
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|---|---|
| Authors | ;Charles J. Reyner;Arnold M. Kiefer;Gamini Ariyawansa;Joshua M. Duran;John E. Scheihing |
| Journal | turk kardiyoloji dernegi arsivi |
| Year | 2016 |
| DOI |
10.3390/cryst6110150
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