High-densely packed and uniformly distributed molybdenum oxide nanorods have been grown onto glass substrates by RF magnetron sputtering and subsequent annealing in an oxygen atmosphere. A two-step growth mechanism (sputtering redeposition and enhanced rearrangement during annealing) for the formation of MoO3 nanorods has been proposed. The morphological, structural, optical and electrical properties of the nanorods have been investigated systematically using atomic force microscopy, scanning electron microscopy, x-ray diffraction, micro-Raman, UV-visible, photoluminescence (PL) spectroscopy and dc resistivity studies. The nanorods in the as-sputtered film and the film annealed at 473 K are amorphous in nature. However, the nanorods in the films annealed at 573 and 673 K exhibit the presence of monoclinic Mo 8O23 and orthorhombic MoO3, respectively. Vibrational analysis of the molybdenum and oxygen atoms in the nanorods is carried out by micro-Raman spectra. The nanorods show room temperature PL in the UV-visible region. The PL emission is found to be strongly enhanced by post-deposition annealing. The low temperature resistivity measurement is done on the as-deposited film; the activation energy and polaron hopping energy for electrical conduction are calculated. The MoO3 nanorods are expected to exhibit enhanced functionality, particularly in nanoscale, photochromic and gas sensing applications.
"As increasing the thickness from 10 to 15 nm, the JSC decreases from 8.87 to 8.18 mA cm-2 and the fill factor (FF) decreases from 0.315 to 0.307, and as a result, the PCE decreases from 1.01% to 0.90%. Previous works had reported that MoO3 has a quite high electrical resistivity (>109 Ω cm) [13-15]. Therefore, the deterioration of the IOSC performance may be induced by a higher intrinsic resistance of the MoO3 with 15 nm, restraining the charge transport from the active layer to Al electrodes. "
[Show abstract][Hide abstract] ABSTRACT: ABSTRACT: Flake-like Al-doped ZnO (AZO) nanostructures including dense AZO nanorods were obtained via a low-temperature (100°C) hydrothermal process. By doping and varying Al concentrations, the electrical conductivity (σ) and morphology of the AZO nanostructures can be readily controlled. The effect of σ and morphology of the AZO nanostructures on the performance of the inverted organic solar cells (IOSCs) was studied. It presents that the optimized power conversion efficiency of the AZO-based IOSCs is improved by approximately 58.7% compared with that of un-doped ZnO-based IOSCs. This is attributed to that the flake-like AZO nanostructures of high σ and tunable morphology not only provide a high-conduction pathway to facilitate electron transport but also lead to a large interfacial area for exciton dissociation and charge collection by electrodes.
Nanoscale Research Letters 10/2011; 6(1):546. DOI:10.1186/1556-276X-6-546 · 2.78 Impact Factor
"Molybdenum trioxide nanostructures can be produced under some conditions including solution method , hydrothermal method , and thermal evaporation   . The synthesis and the growth mechanism of MoO 3 nanostructures have been investigated         . "
[Show abstract][Hide abstract] ABSTRACT: We study the field emission characteristics of large-area films of crystalline MoO3 microbelt grown on silicon substrate by thermal evaporation in air using a commercial infrared sintering furnace. It is found that their turn-on field, threshold field, resistance to microdischarge and field emission current stability are better than MoO3 nanowires, MoO3 nanobelts and MoO3 nanoflower. In addition, good uniform distribution of field emission sites can be observed. The physical reasons are explained responsible for such improvements on field emission characteristics of MoO3 material. These results indicate that large-area MoO3 microbelts may be suitable for cold-cathode electron source application.
Journal of Nanomaterials 01/2010; 1155. DOI:10.1155/2010/136860 · 1.64 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The formation of MoO(3) sheets of nanoscale thickness is described. They are made from several fundamental sheets of orthorhombic alpha-MoO(3), which can be processed in large quantities via a low cost synthesis route that combines thermal evaporation and mechanical exfoliation. These fundamental sheets consist of double-layers of linked distorted MoO(6) octahedra. Atomic force microscopy (AFM) measurements show that the minimum resolvable thickness of these sheets is 1.4 nm which is equivalent to the thickness of two double-layers within one unit cell of the alpha-MoO(3) crystal.
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