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8 December 2003 Superlattices for very long wavelength infrared detectors
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We examine the potential of (211) HgTe/CdTe superlattices for applications involving the detection of very long wavelength infrared radiation (cut-off wavelengths longer than 15μm at 40K). The superlattice electronic band structures and radiative and Auger recombination rates were theoretically modeled. The layer widths were optimized to suppress Auger recombination. Several of the theoretically designed superlattices were grown to 200 periods on (211)CdTe/Si substrates and characterized. Both the layer widths and crystal quality were determined by means of x-ray diffraction measurements. The temperature dependent absorption coefficient was measured to determine the cut-off wavelengths. Theory and experiment are in close agreement for energies above 60meV. Reliable experimental data could not be extracted below 60 meV, however the computed H1-E1 energies are useful assessments of the actual cut-offs. We also present transmission electron microscopy images and secondary ion mass spectroscopy data of the grown superlattices. Our results demonstrate the feasibility of using superlattices in very long wavelength infrared detector structures.
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Hye Son Jung, Christoph H. Grein, and Charles R. Becker "Superlattices for very long wavelength infrared detectors", Proc. SPIE 5209, Materials for Infrared Detectors III, (8 December 2003);


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