TEMPERATURE AND ALLOY COMPOSITIONAL DEPENDENCES OF ENERGY GAP OF HG1-XCDXTE

The temperature and compositional dependences of the energy gap are determined for the alloy semiconductor mercury-cadmium telluride (Hg 1-xCdxTe). The cutoff wavelength was measured on photoconductive and photovoltaic infrared detectors where 0.17<x<0.60 over a temperature range 20<T< 300°K. Spectral response curves are shown to indicate the precision of the method. The temperature and compositional dependences of the energy gap are shown and the empirical expression E g (eV) = 1.59x-0.25+5.233(10-4)T(1-2.08x)+0.327x 3 is deduced. © 1969 The American Institute of Physics.