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    Preparation, characterisation and photocurrent study of sol-gel-derived Al, Mg-doped ZnO transparent thin films
    (2014-01-01)
    Chongsri, K.
    ;
    Techitdheera, W.
    ;
    Pecharapa, W.
    In this work, sol-gel spin-coating was employed to prepare ZnO, Al-doped ZnO (AZO) and Mg-doped ZnO (MZO) thin films onto glass substrates. Structural properties and surface morphologies of as-prepared films were characterised by X-ray diffraction (XRD) and scanning electron microscope (SEM) while their optical properties were scrutinised from their transmission spectra measured by UV-VIS spectrophotometer. Their optical responses and sensitivity of the films were investigated by photocurrent spectroscopy. The XRD and SEM results show that the crystallinity and physical structure of as-prepared films are highly affected by Al and Mg doping. UV-VIS spectrophotometer results suggest that Mg and Al dopants could not only improve their optical transparency but also significantly cause the blue-shift in optical band gap of ZnO films. In addition, the enhancement in photosensitivity of ZnO films can be attained by specific Al and Mg doping content. Copyright © 2014 Inderscience Enterprises Ltd.
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    Characterization and photocurrent study of Al, Mg-doped ZnO transparent thin films prepared by sol-gel route
    (2013-03-13)
    Techitdheera, W.
    ;
    Chongsri, K.
    ;
    Pecharapa, W.
    In this work, ZnO, Al-doped ZnO (AZO) and Mg-doped ZnO (MZO) thin films were deposited onto glass substrates by sol-gel spin-coating method. The doping composition was varied from 0-10 at.%. Structural properties and surface morphologies of as-prepared films were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). Optical properties of the films were interpreted from their transmission spectra using UV-VIS spectrophotometer. The photocurrent spectroscopy was employed to study their optical response and sensitivity of the films. The XRD and SEM results disclosed that the crystallinity and grain size of as-prepared films were strongly influenced by Al and Mg doping. UV-VIS spectrophotometer results indicated that Mg and Al additives could not only efficiently improve the optical transparency but also obviously induce the blue-shift in optical band gap of ZnO films. The photocurrents of as-prepared films disclosed that the enhancement in photosensitivity of ZnO films can be achieved by specific content of either Al or Mg additives. © 2013 IEEE.