We have measured the temperature dependence of the spectral features of the direct gaps of ZnSe and ${\mathrm{Zn}}_{0.56}$${\mathrm{Cd}}_{0.44}$Se in the temperature range 25 K<T<400 K using contactless electroreflectance. The parameters that describe the temperature variation of the energy (including thermal expansion effects) and broadening function of the band gaps have been evaluated. © 1996 The American Physical Society.

• Received 3 January 1996

DOI:https://doi.org/10.1103/PhysRevB.54.1819