Physics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992uchi.rept.....g&link_type=abstract
Final Report, 1 Aug. 1986 - 31 Aug. 1989 Illinois Univ., Chicago. Dept. of Physics.
Physics
Ellipsometry, Mercury Cadmium Tellurides, Mis (Semiconductors), Zinc Tellurides, Crystal Growth, Gallium Arsenides, Heterojunctions, Temperature Effects, Zinc Selenides
Scientific paper
The work performed under this contract represents an extension of our past work on mercury cadmium telluride (MCT). Under this contract we have focussed on the use of spectroscopic ellipsometry (SE) and the development of new theoretical and analytical tools for the analysis of SE data. Our major achievement was the demonstration of an excellent, physically understandable correlation between the low-temperature dark storage time of MIS devices built on bulk MCT samples and a parameter measured by room-temperature electrolyte electroreflectance (EER) on those samples. The analysis which led to this result required the input of SE data obtained under this contract as well as the EER data. The other experimental results obtained under this grant were the determination of the nature of the broadening of critical-point transition energies in semiconductor alloys and compounds and SE measurements of critical-point energies and of the thickness of the ZnSe epilayers for ZnSe/GaAs heterojunctions. Theoretical and analytical work performed under this contract included the determination of the origin of the quasiperiodic oscillations in numerically differentiated SE data, a procedure to minimize those oscillations, the development of a method to obtain more accurate values of critical-point energies and linewidths from SE data, and the initial work on the development of a greatly improved model for the optical dielectric function.
Garland James W.
Raccah Paul M.
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