Browsing by Author "MAHROUG, Abdelhafid"

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    STUDIES ON STRUCTURAL, SURFACE MORPHOLOGICAL, OPTICAL, LUMINESCENCE AND UV PHOTODETECTION PROPERTIES OF SOL–GEL Mg-DOPED ZnO THIN FILMS
    (Université de M'sila, 2018-03) MAHROUG, Abdelhafid
    Undoped and magnesium-doped zinc oxide thin ¯lms were prepared by the sol–gel method. Results from X-ray di®raction indicated that the ¯lms exhibited a hexagonal wurtzite structure and were highly oriented along the c-axis. The intensity of the (002) di®raction peak increased with increasing the Mg doping concentration. Also, Mg doping inhibited the growth of crystallite size which decreased from 46nm to 38nm with doping concentration. Morphological studies by atomic force microscopy (AFM) indicated the uniform thin ¯lm growth and the decreasing of grain size and surface roughness with Mg doping. Optical analysis showed that the average transmittance of all ¯lms was above 90% in the visible range and Mg doping has signi¯cantly enhanced the bandgap energy of ZnO. Two Raman modes assigned to E2L and E2H for the ZnO wurtzite structure were observed for all ¯lms. UV emission peak and three defect emission peaks in the visible region were observed by photoluminescence measurements at room temperature. The intensity ratio of UV emission to the visible emission increased with the Mg concentration. Photocurrent measurements revealed that all ¯lms presented the photoresponses with n-type semiconducting behavior and their