Search Results - "Ocaya, R.O."

Effect of annealing on the efficiency of ambient-atmosphere fabricated MAPbI3 perovskite solar cells by Malevu, T.D., Mwankemwa, B.S., Tshabalala, K.G., Ocaya, R.O.

“…We describe a novel and cost-effective method to enhance the photo-conversion efficiency of blended PbI2/TiO2 perovskite photovoltaic cells by pre-annealing…”
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Electrical, optical and structural properties of pure and gold-coated VO2 thin films on quartz substrate by Dejene, F.B., Ocaya, R.O.

“…In the present study, vanadium dioxide films were grown on quartz glass substrate by reactive KrF laser ablation technique using a vanadium dioxide target. The…”
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C-language package for standalone embedded atom method molecular dynamics simulations of fcc structures by Ocaya, R.O., Terblans, J.J.

“…Ab-initio molecular dynamics (MD) employs Newtonian mechanics to model and simulate the time evolution of particle trajectories in material science ensembles…”
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Synthesis and degradation kinetics of a novel polyester containing bithiazole rings by He, W., Jiang, Y.Y., Luyt, A.S., Ocaya, R.O., Ge, T.J.

“…► A novel Schiff base type polyester was synthesized and characterized by FTIR spectroscopy, elemental analysis, and X-ray diffraction spectroscopy. ► Thermal…”
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Ocaya–Yakuphanoğlu method for series resistance extraction and compensation of Schottky diode I–V characteristics by Ocaya, R.O., Yakuphanoğlu, F.

“…We present a novel resistance-compensated I–V method to extract the series resistance, ideality factor, barrier height and built-in potential of a…”
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Effect of Annealing Temperature on Structural, Morphology and Optical Properties of ZnO Nano-Needles Prepared by Zinc-Air Cell System Method by Malevu, T.D, Ocaya, R.O

“…ZnO nano-needles have been synthesized successfully on zinc substrate with the zinc-air cell method at room temperature. The effect of annealing temperature on…”
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Organic semiconductor photosensors by Ocaya, R.O., Al-Sehemi, Abdullah G., Al-Ghamdi, Ahmed, El-Tantawy, Farid, Yakuphanoglu, F.

“…Coumarin doped with poly(3-hexylthiophene)/p-Si photodiodes were prepared by the drop-casting technique. The current–voltage characteristics of the prepared…”
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Effect of annealing temperature on nano-crystalline TiO2 for solar cell applications by Malevu, T.D., Mwankemwa, B.S., Motloung, S.V., Tshabalala, K.G., Ocaya, R.O.

“…This study investigates the effect of annealing temperature (AT) on structure, morphology and optical properties of hydrothermally synthesized TiO2…”
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New photodiodes based graphene-organic semiconductor hybrid materials by Mekki, A., Ocaya, R.O., Dere, A., Al-Ghamdi, Ahmed A., Harrabi, K., Yakuphanoglu, F.

“…[Display omitted] •Nanocomposites of graphene oxide doped with the coumarin diodes were fabricated.•The transient photocurrent measurement indicates that the…”
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Phase transformations of high-purity PbI2 nanoparticles synthesized from lead-acid accumulator anodes by Malevu, T.D., Ocaya, R.O., Tshabalala, K.G.

“…High-purity hexagonal lead iodide nanoparticles have been synthesized from a depleted sealed lead acid battery anode. The synthesized product was found to…”
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Analysis of photoconductive mechanisms of organic-on-inorganic photodiodes by Ocaya, R.O., Dere, A., Al-Sehemi, Abdullah G., Al-Ghamdi, Ahmed A., Soylu, M., Yakuphanoglu, F.

“…In this work, it is shown that choosing an organic-on-inorganic Schottky diode for photoconductive sensing by a using a power law exponent (PLE or γ)…”
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Organic photodetector with coumarin-adjustable photocurrent by Ocaya, R.O., Al-Ghamdi, Ahmed, Mensah-Darkwa, Kwadwo, Gupta, R.K., Farooq, W., Yakuphanoglu, F.

“…[Display omitted] •Drop casting technique was used to fabricate Al/p-Si/coumarin doped fullerite/Al diode.•Coumarin doped fullerite diodes indicate a non-ideal…”
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Synthesis of ZnO Nanoparticles Using a Zinc-Air Cell and Investigation of the Effect of Electrolyte Concentration by Malevu, T.D., Ocaya, R.O.

“…We propose a method to synthesize ZnO nanoparticles. A layer of well-aligned zinc oxide (ZnO) nanoneedles was synthesized on zinc plate at room temperature…”
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Synthesis and characterization of high-quality PbI $$_{2}$$ 2 nanopowders from depleted SLA accumulator anode and cathode by Malevu, T. D., Ocaya, R. O., Tshabalala, K. G., Fernandez, C.

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An Investigation of Nanostructure Morphology in the Zinc-Air Cell Method as a Function of Electrolyte Concentration by Malevu, T.D., Ocaya, R.O.

“…Earlier studies of the formation of ZnO nanostructures using the zinc-air cell method have indicated a rich presence of nanostructures such as hierarchical…”
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A current–voltage–temperature method for fast extraction of schottky diode static parameters by Ocaya, R.O.

“…•We propose a novel current–voltage–temperature (IVT) method for schottky diodes.•I–V characteristics are put into useful IVT form.•The method enables the…”
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Thermal sensor based zinc oxide diode for low temperature applications by Ocaya, R.O., Al-Ghamdi, Ahmed, -Tantawy, F. El, Farooq, W.A., Yakuphanoglu, F.

“…The device parameters of Al/p-Si/Zn1-xAlxO-NiO/Al Schottky diode for x = 0.005 were investigated over the 50 K–400 K temperature range using direct…”
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Electrical, optical and structural properties of pure and gold-coated VO 2 thin films on quartz substrate by Dejene, F.B., Ocaya, R.O.

“…In the present study, vanadium dioxide films were grown on quartz glass substrate by reactive KrF laser ablation technique using a vanadium dioxide target. The…”
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Graphene-oxide doped 2.9.16.23-tetrakis-4-{4-[(2E)-3-(naphthalen-1-yl)prop-2-enoyl]phenoxy}-phthalocyaninato cobalt(II)/Au photodiodes by Ocaya, R.O., Dere, A., Tuncer, H., Al-Ghamdi, Ahmed A., Sari, Derya C., Yakuphanoglu, F.

“…[Display omitted] •GO:CoPc/p-Si/Au Schottky diodes were prepared by drop casting method.•The ideality factor of the diode was found to depend significantly on…”
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Ambipolar small molecular semiconductor-based heterojunction diode by Ocaya, R.O., Özdemir, Mehmet, Özdemir, Resul, Al-Ghamdi, Ahmed, Usta, Hakan, Farooq, W.A., Yakuphanoglu, F.

“…[Display omitted] •Ambipolar organic semiconductor based heterojunction diode was fabricated for the first time.•A novel interface-state controlled device…”
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