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Effect of Co and Ni on Au/Zn1-xMxO Nanorods (M = Co and Ni) Schottky Photodiodes Performance

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Au/Zn1-xMxO nanorods (M = Co and Ni) Schottky photodiodes were fabricated on p-Si substrate. The surface morphology, structural, vibrational, electrical and capacitive properties were characterized by field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), Raman spectroscopy, current–voltage (I–V), capacitance–voltage (C–V), and ultraviolet (UV)-illumination measurements. FE-SEM and XRD results show that NR arrays are well distributed, orthogonal to the substrate, and highly oriented along the preferential (002) plane. Distinct peaks of Co and Ni were found in their respective energy dispersive X-ray (EDX) spectrum. An intrinsic characteristic peak was found to be ~437 cm-1 in the Raman spectra which indicates the good crystallinity of Zn1-xMxO NRs. The Schottky photodiodes show good rectifying property in dark condition and the ideality factor to be greater than unity. However, the barrier height was increased attributed to an increase of band gap due to the Burstein-Moss effect, density of interface states, and barrier inhomogeneities. The obtained barrier height was found to be 0.52, 0.54, and 0.53 eV (from I–V measurements) and 0.70, 0.78, and 0.73 eV from C–V measurements, respectively. The carrier density and the responsivity were higher for doped samples than undoped NR arrays suggesting the incorporation of Co and Ni into the ZnO lattice.
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Keywords: Capacitance; Doping; I–V Characteristics; Photoresponse; Schottky Diode

Document Type: Research Article

Affiliations: Department of Physics and Materials Science and Center of Super-Diamond and Advanced Films (COSDAF), City University of Hong Kong, Hong Kong SAR, P. R. China

Publication date: August 1, 2017

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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