Fabrication and structure of nanometer Zn_1-xFe_xSe films

Nanometer Zn_1-xFe_xSe diluted magnetic semiconductor films are fabricated by the double-source deposition. The crystal structure and phonon spectrum feature of the films were studied by X-ray diffraction and Ra-man-scattered spectra. The results show that the lattice parameter of the nanocrystals in Zn_1-xFe_xSe films increases linearly with Fe concentration. The phonon localized effect is observed obviously from the Raman-scattered spectrum. The Raman-scattered peak corresponding to the optical phonon mode for Zn_1-xFe_xSe films displays the broadening and red-shifting with respect to the bulk ZnSe. The expansion of lattice for the nanocrystals results in that the red-shifting of Raman-scattered peak increases linearly with Fe concentration.