Absorption of Narrow Gap HgCdTe Near the Band Edge Including Nonparabolicity and the Urbach Tail (Preprint)

摘要

An analytical model describing the absorption behavior of Hg1-xCdxTe is developed. It simultaneously considers the contributions from non-parabolic conduction/light hole bands and parabolic heavy hole bands obtained from 14- band k&*(number sign)729;p electronic structure calculations as well as the Urbach tail. This model smoothly fits experimental absorption coefficients over energies ranging from the Urbach tail region to the intrinsic absorption region up to at least 300 me V above the band gap.