Modulation Spectroscopy of Disordered Solids.
Final rept. 15 Jan 74-30 Jun 75,
ARIZONA UNIV TUCSON OPTICAL SCIENCES CENTER
Pagination or Media Count:
Two problems were faced at the beginning of this reporting period. The first was the problem of interference fringes hiding the intrinsic response in the infrared below the absorption edge. The other problem was one of the general interpretation of the thermoreflectance spectra of amorphous semiconductors. The authors studied compositions in the Ge-Te alloy system. Through this research it was hoped to learn more about the electronic structure of the system, and also to develop modulation spectroscopy into a viable method for studying amorphous materials. The separation of the structures agree well with the separation of peaks found in the valence band density of states from photoemission studies. Much work has been done in expressing the thermoreflectance in terms of the electronic structure, in particular the density of states profiles of the valence and conduction bands. A procedure has been developed for modeling the density of states profiles to give a theoretical modulated response resembling the experimental data.
- Solid State Physics