Abstract
Modulation spectroscopy is a powerful tool for the study and characterization of semiconductor microstructures such as superlattices, quantum wells and heterojunctions. The richness of the modulated spectra, even at room temperature, can be conveniently used to investigate quantities such as band offsets, well and barrier widths, excitons, strain (lattice mismatched systems), coupling between wells, two-dimensional electron gas, etc. The influence on the quantum levels of external parameters such as pressure, temperature, electric fields, etc. can be explored. In this paper we review some recent works on the GaAs GaAlAs , GaSb AlSb , CdTe CdMnTe and a-Si:H/a-SiC:H systems using various techniques such as photoreflectance, piezoreflectance and thermoreflectance.
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