Ellipsometric studies of Cd1-xMgxTe (0<=x<=0.5) alloys

The determination of the above band gap optical properties of zincblende Cd1-xMgxTe (0 less than or equal to x less than or equal to 0.5) ternary alloys are reported on. Using the parabolic-band critical point model, room-temperature critical point energies of the E-0, E-0 + Delta(0), E-1, E-1 + Delta(1), E-2, and E-0' interband transitions from numerically calculated second energy derivatives of ellipsometric spectra were obtained. The presence of two distinct structures in the E-2 feature for x>0 was also observed. (C) 1997 American Institute of Physics.