RAMAN, INFRARED, PHOTOLUMINESCENCE AND THEORETICAL-STUDIES OF THE II-VI-VI TERNARY CDSETE

We have examined Bridgman-grown zincblende CdSeTe1-x (x < 0.36) by Ram an scattering, Fourier transform infrared reflectivity, photoluminesce nce and theoretical analysis. The Raman data showed evidence of surfac e structural improvement by long-term room temperature annealing. The combined Raman and infrared data confirmed the interpretation that a t hird infrared mode besides the CdTe- and CdSe-like transverse optical phonon modes, arose from non-random atomic clustering. Room temperatur e photoluminescence spectra were obtained and compared with pseudopote ntial calculations.