RAMAN-SCATTERING IN NOVEL (CUALSE2)(X)(2ZNSE)(1-X) AND (CUGASE2)(X)(2ZNSE)(1-X) MIXED-CRYSTALS

The new semiconductor materials (CuAlSe2)(x)(2ZnSe)(1-x) and (CuGaSe2) (x) (2ZnSe)(1-x) are grown by the chemical transport method over all t he compositional range Raman spectra of the mixed crystals are measure d at room temperature. Order-disorder phase transitions from chalcopyr ite to disordered zincblende structure are observed in both materials. Phonon modes are identified on the basis of the phonon assignments of the end components. Some new bands assigned as vibrational modes of t he CuSe and AlSe complexes in ZnSe are found.