The energy gap E , is accurately determined from interband Landau level transitions observed in spectral measurements of photoconductivity at low temperatures in an external magnetic field. The temperature dependence of the optical absorption coefficient is measured on samples with different slopes of the exponential Urbach absorption edge. The results are compared with empirical formulae reported for E,(x, T). In the temperature region 10 to 300K, the best agreement is found for the rclation published by Seiler et al., but with a modified value of the temperature coefficient.Aus Band-Band-Ubergangen zwischen Landau-Zustanden, die in den Photoleitungsspektren im AuOenmagnetfeld bei niedrigen Temperaturen beobachtet wurden, wird die Energielucke E , priizis bestimmt. Die Temperaturabhangigkeit des optischen Absorptionkoeffizienten wird in Proben mit verschiedener Steigung der exponentiellen Urbachschen Absorptionskante gemessen. Die Ergebnissc wcrden mit veroffentlichten empirischen Beziehungen fur E,(x, T ) verglichen. Die beste Ubereinstimmung mit den Experimenten im Temperaturbereich 10 bis 300 K wird fur die Gleichung von Seiler et al. mit einem modifizierten Temperaturkoeffizienten gefunden.
Mercury cadmium telluride (MCT) has become the most important semiconducting material for fabrication of infrared sensors /1, 2 1 . The negative influence of native defects and impurities on the performance of these photon detectors is well known.
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