Abstract
The Zn1−xLixO (x = 0, 0.01, 0.03, and 0.05) nanocrystalline films were synthesized on silicon (Si) substrates by using the sol-gel method. The crystal structure and surface morphology of these films were investigated by X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). We observed that the average grain size was gradually reduced with increasing doping Li content. Photoluminescence (PL) spectra show that increasing the Li content will deteriorate the crystalline quality and result in the decrease of ultraviolet emission from the excitonic recombination and the enhancement of visible emission from the recombination between the intrinsic defects. The current-voltage properties of Zn1−xLixO nanocrystalline films were also studied under dark and photo-illumination for photo-detection applications. The normalized photo-to-dark-current ratio (Iphoto − Idark)/Idark has been enhanced from 315 to 4161 by increasing the Li content of the Zn1−xLixO nanocrystalline films from zero to 0.05.
Highlights
Wide band gap materials with transparent properties are important for photovoltaic and optoelectronic devices
We report a study of the doping effect of Li atoms on the optical and structural properties of Zn1−x Lix O (x = 0, 0.01, 0.03, and 0.05) nanocrystalline films
It is clear from observations that only one main peak located at 2θ = 34.56 degree, which demonstrates that all the Zn1−x Lix O nanocrystalline films consisted of a unique phase
Summary
Wide band gap materials with transparent properties are important for photovoltaic and optoelectronic devices. ZnO crystals or films have been successfully prepared by various kinds of fabrication methods, such as Radio Frequency (RF) magnetic sputtering, chemical vapor deposition, pulsed laser deposition, and sol-gel methods Those fabricating systems require high vacuum and complicated temperature control processes, while the sol-gel process offers more merits due to ease of control of the chemical composition and a much simpler method for large-area coating at a low cost [12]. We report a study of the doping effect of Li atoms on the optical and structural properties of Zn1−x Lix O (x = 0, 0.01, 0.03, and 0.05) nanocrystalline films. We carried out the current-voltage (I–V) measurements under dark and UV illumination to investigate their optical detection properties
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