Browsing by Author "Okyay, Ali Kemal"
Now showing items 21-40 of 140
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Controlling luminescent silicon nanoparticle emission produced by nanosecond pulsed laser ablation: role of interface defect states and crystallinity phase
(Royal Society of Chemistry, 2016)In this study, we provide a systematic study on the origin of green and blue emission from luminescent silicon nanoparticles (Si-NPs) synthesized in water using a nanosecond pulsed laser ablation methodology. Here we report ... -
Corrigendum: Enhancement of polycrystalline silicon solar cells efficiency using indium nitride particles (2015 J. Opt. 17 105903)
(IOP, 2019)In this work, we present a hybrid indium nitride particle/polycrystalline silicon solar cell based on 230 nm size indium nitride particles (InN-Ps) obtained through laser ablation. The solar cell performance measurements ... -
Cubic-phase zirconia nano-island growth using atomic layer deposition and application in low-power charge-trapping nonvolatile-memory devices
(Institute of Physics Publishing Ltd., 2017)The manipulation of matter at the nanoscale enables the generation of properties in a material that would otherwise be challenging or impossible to realize in the bulk state. Here, we demonstrate growth of zirconia ... -
Defect reduction of Ge on Si by selective epitaxy and hydrogen annealing
(2008-10)We demonstrate a promising approach for the monolithic integration of Ge-based nanoelectronics and nanophotonics with S-ilicon: the selective deposition of Ge on Si by Multiple Hydrogen Annealing for Heteroepitaxy (MHAH). ... -
Demonstration of flexible thin film transistors with GaN channels
(American Institute of Physics Inc., 2016)We report on the thin film transistors (TFTs) with Gallium Nitride (GaN) channels directly fabricated on flexible substrates. GaN thin films are grown by hollow cathode plasma assisted atomic layer deposition (HCPA-ALD) ... -
Digitally alloyed ZnO and TiO2 thin film thermistors by atomic layer deposition for uncooled microbolometer applications
(AVS Science and Technology Society, 2017)The authors demonstrate the digital alloying of ZnO and TiO2 via atomic layer deposition method to be utilized as the active material of uncooled microbolometers. Depositions are carried out at 200 °C. Crystallinity of the ... -
Diode behavior in ultra-thin low temperature ALD grown zinc-oxide on silicon
(AIP Publishing, 2013)A thin-film ZnO(n)/Si(p+) heterojunction diode is demonstrated. The thin film ZnO layer is deposited by Atomic Layer Deposition (ALD) at different temperatures on a p-type silicon substrate. Atomic force microscopy (AFM) ... -
Dipole antenna couplers for subwavelength metal-insulator-metal waveguides
(Optical Society of America, 2010)Near-infrared light (λ=1550 nm) was coupled into a 100-nm-core Ag/SiO2/Ag waveguide using dipole antennas. We demonstrate that using antennas, the field intensity inside the waveguide can be enhanced by changing the antenna ... -
Dynamic control of photoresponse in ZnO-based thin-film transistors in the visible spectrum
(IEEE, 2013-04)We present ZnO-channel thin-film transistors with actively tunable photocurrent in the visible spectrum, although ZnO band edge is in the ultraviolet. ZnO channel is deposited by atomic layer deposition technique at a low ... -
Effect of Au nano-particles on TiO2 nanorod electrode in dye-sensitized solar cells
(Elsevier, 2012-05-26)Au nano particles (NPs) were deposited on vertically grown TiO2 nanorod arrays on FTO substrate by hydrothermal process. Metal nanoparticles were loaded onto the surface of TiO2 nanorods via photochemical reduction process ... -
Effect of gold nanoparticles size on light scattering for thin film amorphous-silicon solar cells
(Elsevier Ltd, 2014-05)In this work, the effect of gold (Au) nanoparticles on the performance of a-Si:H solar cells is investigated experimentally. The solar cell stack is grown on a highly doped p-type Si wafer and consists of 20nm heavily doped ... -
Effect of milling time on the structure, micro-hardness, and thermal behavior of amorphous/nanocrystalline TiNiCu shape memory alloys developed by mechanical alloying
(Elsevier Ltd, 2014)In the present paper, the effect of milling process on the chemical composition, structure, microhardness, and thermal behavior of Ti-41Ni-9Cu compounds developed by mechanical alloying was evaluated. The structural ... -
Effect of reactor pressure on optical and electrical properties of InN films grown by high-pressure chemical vapor deposition
(Wiley - V C H Verlag GmbH & Co. KGaA, 2015)The influences of reactor pressure on the stoichiometry, free carrier concentration, IR and Hall determined mobility, effective optical band edge, and optical phonon modes of HPCVD grown InN films have been analysed and ... -
Electrically controlled resistive switching assisted active ultra-broadband optical tunability in the infrared
(IEEE, 2013)We present an electrically tunable optical device with ultra-broadband tunability operating in 2-10 μm spectrum. We also, for the first time, optically observe resistive switching behavior in reflection measurements under ... -
Electronic and optical device applications of hollow cathode plasma assisted atomic layer deposition based GaN thin films
(A I P Publishing LLC, 2015)Electronic and optoelectronic devices, namely, thin film transistors (TFTs) and metal-semiconductor-metal (MSM) photodetectors, based on GaN films grown by hollow cathode plasma-assisted atomic layer deposition (PA-ALD) ... -
Electronic and optical properties of atomic layer-deposited ZnO and TiO2
(Springer New York LLC, 2018)Metal oxides are attractive for thin film optoelectronic applications. Due to their wide energy bandgaps, ZnO and TiO2 are being investigated by many researchers. Here, we have studied the electrical and optical properties ... -
Emerging photoluminescence from defective vanadium diselenide nanosheets
(OSA - The Optical Society, 2018)In this paper, for the first time to our knowledge in the literature, we demonstrate photoluminescence from two-dimensional (2D) vanadium diselenide (VSe2) nanosheets (NSs). The preparation of these nanostructures is carried ... -
Enhanced light scattering with energy downshifting using 16 nm indium nitride nanoparticles for improved thin-film a-Si N-i-P solar cells
(Electrochemical Society Inc., 2015-05)In this work the effect of Indium nitride (InN) nanoparticles (NPs) on the performance of a-Si: H solar cells has been investigated. The average J<inf>sc</inf> of InN NPs coated cells was found 6.76 mA/cm2 which is 16.69% ... -
Enhanced memory effect via quantum confinement in 16 nm InN nanoparticles embedded in ZnO charge trapping layer
(AIP Publishing, 2014)In this work, the fabrication of charge trapping memory cells with laser-synthesized indium-nitride nanoparticles (InN-NPs) embedded in ZnO charge trapping layer is demonstrated. Atomic layer deposited Al2O3 layers are ... -
Enhanced memory effect with embedded graphene nanoplatelets in ZnO charge trapping layer
(AIP Publishing, 2014)A charge trapping memory with graphene nanoplatelets embedded in atomic layer deposited ZnO (GNIZ) is demonstrated. The memory shows a large threshold voltage Vt shift (4 V) at low operating voltage (6/-6 V), good retention ...
