Temperature dependence of the energy gap and free carrier absorption in bulk InAs[sub 0.05]Sb[sub 0.95] single crystals

Bansal, Bhavtosh; Dixit, V. K.; Venkataraman, V.; Bhat, H. L.
June 2003
Applied Physics Letters;6/30/2003, Vol. 82 Issue 26, p4720
Academic Journal
Temperature dependence of the energy gap and free carrier absorption in a high-quality InAs[SUB0.05]Sb[SUB0.95] single crystal was studied between 90 K and 430 K through the absorption spectra. At this alloy concentration, the room-temperature energy gap was measured to be 0.15 eV. Varshni- and the Bose-Einstein-type fit parameters were obtained from the measured temperature dependence of the energy gap, and the latter gave the zero-temperature gap to be 0.214 eV. It was found that although Weider's empirical formula for the dependence of the energy gap on temperature and the alloy concentration agrees with the value of the gap at room temperature, it is inaccurate in describing its temperature dependence. From the free carrier absorption measurements, the phonon limited cross section of 7.35×10[SUP-16] cm[SUP-2] at 15 mm was deduced at room temperature.


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