Study on Raman spectrum of CdZnTe wafer

The effects of surface treatments, laser power and wavelength changes on Raman spectrum of CdZnTe wafers were studied. The experiment shows that mechanical polishing, Br-MeOH solution and Br-MeOH + KOH/MeOH solution treatment can lead to the changes of lattice perfection of CdZnTe wafer surface, which make Raman spectrum exhibit greater variation. Raman scattering spectra of CdZnTe wafers were also different at 514.5 nm, 632.8 nm and 785 nm laser excitation wavelengths, and Raman scattering spectra of basic phonon vibrations from CdZnTe wafer were submergence by the fluorescence signals in range 100-200 cm^-1. we should choose lower power of laser when Raman spectra of CdZnTe wafer were measured.