Evaluation of the quality of the etching process with the piezoelectric spectroscopy method

This paper is the presentation of photothermal piezoelectric studies of the optical properties performed on a series of AII-BVI mixed crystals. This approach enables not only determination of the basic optical parameters of mixed crystals such as the energy gap value or Urbach edge parameters but it also turned out to be a useful tool for investigations of the surface quality of the samples.