Temperature, Thickness, and Interfacial Composition Effects on the Absorption Properties of (Hg, Cd)Te Epilayers Grown by Liquid-Phase Epitaxy on CdZnTe
Authors: Littler, C.L.; Gorman, B.P.; Weirauch, D.F.; Liao, P.K.; Schaake, H.F.
Source: Journal of Electronic Materials, Volume 34, Number 6, June 2005 , pp. 768-772(5)
Abstract:Transmission spectra of liquid-phase epitaxy (LPE) Hg1−xCdxTe with Cd mole fractions in the range of 0.23 < x < 0.30 have been obtained as a function of temperature and thickness. The results are described using a model consisting of exponential (Urbach) absorption in the band tail region and band-to-band absorption, predicted by a Kane k . p model, for the above band gap region. Modifications to the Urbach and transmission expressions are found to be necessary to properly describe the shape, temperature, and thickness dependence of the spectra. A known composition gradient was found to be sufficient to describe the spectra obtained for thin (<20-m) samples.
Document Type: Research Article
Publication date: 2005-06-01