Abstract
The temperature dependence of the direct band gap in CdTe is investigated theoretically. The available experimental data shows that the band edges vary as T 2 at low temperatures. The calculations indicate the band shifts are due to hole interactions with acoustical phonons; the temperature dependent shifts in the conduction band are negligible. Good agreement between predicted and measured band edge shifts are obtained when the degeneracy and p-symmetry of the valence band are considered. This allows the influence of TA phonons to be included, which provide the major contribution to the hole self energies.
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