M. M. Morshed

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Electrically pumped random lasing based on an Au-ZnO nanowire Schottky junction diode is demonstrated. The device exhibits typical Schottky diode current-voltage characteristics with a turn-on voltage of 0.7 V. Electroluminescence characterization shows good random lasing behavior and the output power is about 67 nW at a drive current of 100 mA. Excitonic(More)
Understanding the flow fields at the micro-scale is key to developing methods of success-fully mixing fluids for micro-scale applications. This paper investigates flow characteristics and mixing efficiency of three different geometries in micro-channels. The geometries of these channels were rectangular with a dimension of; 300 m wide, 100 m deep and 50 mm(More)
Cu-doped p-type ZnO films are grown on c-sapphire substrates by plasma-assisted molecular beam epitaxy. Photoluminescence (PL) experiments reveal a shallow acceptor state at 0.15 eV above the valence band edge. Hall effect results indicate that a growth condition window is found for the formation of p-type ZnO thin films, and the best conductivity is(More)
An electrically pumped Sb-doped ZnO nanowire/Ga-doped ZnO p-n homojunction random laser is demonstrated. Catalyst-free Sb-doped ZnO nanowires were grown on a Ga-doped ZnO thin film on a Si substrate by chemical vapor deposition. The morphology of the as-grown titled nanowires was observed by scanning electron microscopy. X-ray photoelectron spectroscopy(More)
Articles you may be interested in Energy-selective multichannel ultraviolet photodiodes based on (Mg,Zn)O Appl. The effect of oxygen flow rate and radio frequency plasma power on cubic ZnMgO ultraviolet sensors grown by plasma-enhanced molecular beam epitaxy Appl. Electrically pumped near-ultraviolet lasing from ZnO/MgO core/shell nanowires Appl.
Related Articles Investigation of the origin of glassiness in La0.5Sr0.5CoO3 J. Appl. Phys. 113, 17E114 (2013) Stabilization of the in-plane vortex state in two-dimensional circular nanorings J. Appl. Phys. 113, 093901 (2013) Effect of longitudinal degree of freedom of magnetic moment in body-centered-cubic iron J. Appl. Phys. 113, 17E112 (2013) Magnetic(More)
Carbon nanostructures in various forms and sizes, and with different speciation properties have been prepared from graphite by Liquid Phase Pulsed Laser Ablation (LP-PLA) using a high frequency Nd:YAG laser. High energy densities and pulse repetition frequencies of up to 10 kHz were used in this ablation process to produce carbon nanomaterials with unique(More)
Temperature-dependent photoluminescence of nitrogen-doped p-type MgxZn1-xO nanocrystalline thin film grown on c-plane sapphire substrate by rf plasma-assisted molecular beam epitaxy is investigated. P-type behavior is confirmed by both Hall effect and Seebeck measurements. Structural defect-related bound excitonic emission peak is distinguished at around(More)
The chirality (n, m) of single walled carbon nanotubes (SWNTs) in the samples produced by alcohol catalytic CVD method on quartz substrate and by HiPco (High-pressure CO technique) process has been determined using the optical absorption spectra of the samples and the composition in the two samples has been compared. It has been found that, the average(More)