keyword
MENU ▼
Read by QxMD icon Read
search

Semiconductors

keyword
https://www.readbyqxmd.com/read/28454482/effects-of-environmental-factors-and-metallic-electrodes-on-ac-electrical-conduction-through-dna-molecule
#1
S Abdalla, A Obaid, F M Al-Marzouki
BACKGROUND: Deoxyribonucleic acid (DNA) is one of the best candidate materials for various device applications such as in electrodes for rechargeable batteries, biosensors, molecular electronics, medical- and biomedical-applications etc. Hence, it is worthwhile to examine the mechanism of charge transport in the DNA molecule, however, still a question without a clear answer is DNA a molecular conducting material (wire), semiconductor, or insulator? The answer, after the published data, is still ambiguous without any confirmed and clear scientific answer...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28454477/in-situ-analysis-of-oxygen-vacancies-and-band-alignment-in-hfo2-tin-structure-for-cmos-applications
#2
Da-Peng Xu, Lin-Jie Yu, Xu-Dong Chen, Lin Chen, Qing-Qing Sun, Hao Zhu, Hong-Liang Lu, Peng Zhou, Shi-Jin Ding, David Wei Zhang
The density of oxygen vacancies characterization in high-k/metal gate is significant for semiconductor device fabrication. In this work, a new approach was demonstrated to detect the density of oxygen vacancies by in situ x-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS) measurement. Moreover, the band alignment of the structure with optical band gap measured by spectroscopic ellipsometry (SE) and valence band offset by UPS were reported. The specific areal density of oxygen vacancies in high-k dielectric of HfO2/TiN was obtained by fitting the experiment data to be 8...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28454169/speckle-based-hyperspectral-imaging-combining-multiple-scattering-and-compressive-sensing-in-nanowire-mats
#3
Rebecca French, Sylvain Gigan, Otto L Muskens
Encoding of spectral information onto monochrome imaging cameras is of interest for wavelength multiplexing and hyperspectral imaging applications. Here, the complex spatiospectral response of a disordered material is used to demonstrate retrieval of a number of discrete wavelengths over a wide spectral range. Strong, diffuse light scattering in a semiconductor nanowire mat is used to achieve a highly compact spectrometer of micrometer thickness, transforming different wavelengths into distinct speckle patterns with nanometer sensitivity...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28454164/multiple-wavelength-distributed-feedback-laser-arrays-with-high-coupling-coefficients-and-precise-channel-spacing
#4
Song Tang, Lianping Hou, Xiangfei Chen, John H Marsh
Special designs of sampled Bragg gratings have been used to fabricate distributed-feedback semiconductor laser arrays with very precise wavelength spacing and strong coupling coefficients. By dividing one sampling period into two equal sections, each with a grating but with a π-phase shift between the sections, the ±1st-order channels are enhanced while eliminating the zeroth-order reflection. By using multiple phase-shifted sections, only the -1st-order channel is enhanced. Using a single electron beam lithography step and two π-phase-shifted sections, we have fabricated an eight-channel laser array with a channel spacing of 100 GHz...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28453981/facile-synthesis-of-flower-like-ag3vo4-bi2wo6-heterojunction-with-enhanced-visible-light-photocatalytic-activity
#5
Shijie Li, Shiwei Hu, Wei Jiang, Yu Liu, Jianshe Liu, Zhaohui Wang
Constructing novel semiconductor heterojunctions is one of the most significant approaches to improving the photocatalytic performance of a photocatalyst. Herein, the Ag3VO4/Bi2WO6 heterojunction was prepared through in-situ anchoring Ag3VO4 nanoparticles (size: ∼21nm) on the surface of Bi2WO6 microflowers (diameter: 2.5-4.5μm) by a facile deposition route. The photocatalytic activity of these heterojunctions were studied by decomposing cationic dye rhodamine B (RhB), anionic dye methyl orange (MO) and neutral para-chlorophenol (4-CP) under visible light irradiation (λ>400nm)...
April 20, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28448140/essentially-trap-free-cspbbr3-colloidal-nanocrystals-by-post-synthetic-thiocyanate-surface-treatment
#6
Brent A Koscher, Joseph K Swabeck, Noah D Bronstein, A Paul Alivisatos
We demonstrate post-synthetic modification of CsPbBr3 nanocrystals by a thiocyanate salt treatment. This treatment improves the quantum yield of both freshly synthesized (PLQY~90%) and aged nanocrystals (PLQY~70%) to within measurement error (2-3%) of unity, while simultaneously maintaining the shape, size, and colloidal stability. Additionally, the luminescence decay kinetics transform from multi-exponential decays typical of nanocrystalline semiconductors with a distribution of trap sites, to a monoexponential decay, typical of single energy level emitters...
April 27, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28447776/investigation-of-the-changes-in-electronic-properties-of-nickel-oxide-niox-due-to-uv-ozone-treatment
#7
Raisul Islam, Gang Chen, Pranav Ramesh, Junkyo Suh, Nobi Fuchigami, Donovan Lee, Karl A Littau, Kurt Weiner, Reuben T Collins, Krishna C Saraswat
Drastic reduction in nickel oxide (NiOx) film resistivity and ionization potential is observed when subjected to ultraviolet (UV)/ ozone (O3) treatment. X-ray photoemission spectroscopy suggests that UV/O3 treatment changes the film stoichiometry by introducing Ni vacancy defects. Oxygen-rich NiOx having Ni vacancy defects behaves as a p type semiconductor. Therefore, in this work, a simple and effective technique to introduce doping in NiOx is shown. Angle resolved XPS reveals that the effect of UV/O3 treatment does not only alter the film surface property, but also introduces oxygen-rich stoichiometry throughout the depth of the film...
April 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28447707/thickness-dependent-schottky-barrier-height-of-mos2-field-effect-transistors
#8
Junyoung Kwon, Jong-Young Lee, Young-Jun Yu, Chul-Ho Lee, Xu Cui, James Hone, Gwan-Hyoung Lee
2D semiconductors, including transition metal dichalcogenides (TMDs), have been widely studied recently. However, the device performance is deteriorated due to the significant contact resistance. The contact resistance of MoS2-metal contacts decreases with the thickness of MoS2. We obtained a Schottky barrier height as low as about 70 meV when MoS2 is trilayer-thick. It is important to find the optimal choice of contact metal and layer thickness of MoS2.
April 27, 2017: Nanoscale
https://www.readbyqxmd.com/read/28447695/phase-transformation-of-tio2-nanoparticles-by-femtosecond-laser-ablation-in-aqueous-solutions-and-deposition-on-conductive-substrates
#9
Paola Russo, Robert Liang, Rui Xiu He, Y Norman Zhou
Titanium dioxide (TiO2) is a wide bandgap semiconductor that is chemically stable, non-toxic, and economical compared to other semiconductors and has been implemented in a wide range of applications such as photocatalysis, photovoltaics, and memristors. In this work we studied the femtosecond laser ablation of titanium dioxide powders (P25) dispersed either in water or deposited onto a fluoride-doped tin oxide (FTO) substrate. The process was used as a route to induce the phase-transformation of TiO2 nanoparticles which was governed by laser parameters such as ablation time and power...
April 27, 2017: Nanoscale
https://www.readbyqxmd.com/read/28447680/subthreshold-swing-improvement-in-mos2-transistors-by-the-negative-capacitance-effect-in-a-ferroelectric-al-doped-hfo2-hfo2-gate-dielectric-stack
#10
Amirhasan Nourbakhsh, Ahmad Zubair, Sameer Joglekar, Mildred Dresselhaus, Tomás Palacios
Obtaining a subthreshold swing (SS) below the thermionic limit of 60 mV dec(-1) by exploiting the negative-capacitance (NC) effect in ferroelectric (FE) materials is a novel effective technique to allow the reduction of the supply voltage and power consumption in field effect transistors (FETs). At the same time, two-dimensional layered semiconductors, such as molybdenum disulfide (MoS2), have been shown to be promising candidates to replace silicon MOSFETs in sub-5 nm-channel technology nodes. In this paper, we demonstrate NC MoS2 FETs by incorporating a ferroelectric Al-doped HfO2 (Al : HfO2), a technologically compatible material, in the FET gate stack...
April 27, 2017: Nanoscale
https://www.readbyqxmd.com/read/28445643/pinhole-free-hybrid-perovskite-film-with-arbitrarily-shaped-micro-patterns-for-functional-optoelectronic-devices
#11
Jiang Wu, Junyan Chen, Yifei Zhang, Zhaojian Xu, Lichen Zhao, Tanghao Liu, Deying Luo, Wenqiang Yang, Ke Chen, Qin Hu, Fengjun Ye, Pan Wu, Rui Zhu, Qihuang Gong
In many optoelectronic applications, patterning is required for functional and/or aesthetic purposes. However, established photolithographic technique can't be applied directly to the hybrid perovskites, which are considered as promising candidates for optoelectronic applications. In this work, a wettability-assisted photolithography (WAP) process, which employs photolithography and one-step solution process to deposit hybrid perovskite, was developed for fabricating patterned hybrid perovskite films. Uniform pinhole-free hybrid perovskite films with sharp-edged micro-patterns of any shapes can be constructed through the WAP process...
April 26, 2017: Nano Letters
https://www.readbyqxmd.com/read/28445403/detection-of-hepatitis-b-virus-m204i-mutation-by-quantum-dot-labeled-dna-probe
#12
Cheng Zhang, Yiping Chen, Xinmiao Liang, Guanhua Zhang, Hong Ma, Leng Nie, Yu Wang
Quantum dots (QDs) are semiconductor nanoparticles with a diameter of less than 10 nm, which have been widely used as fluorescent probes in biochemical analysis and vivo imaging because of their excellent optical properties. Sensitive and convenient detection of hepatitis B virus (HBV) gene mutations is important in clinical diagnosis. Therefore, we developed a sensitive, low-cost and convenient QDs-mediated fluorescent method for the detection of HBV gene mutations in real serum samples from chronic hepatitis B (CHB) patients who had received lamivudine or telbivudine antiviral therapy...
April 26, 2017: Sensors
https://www.readbyqxmd.com/read/28445163/annealing-of-au-ag-and-au-ag-alloy-nanoparticle-arrays-on-gaas-100-and-111-b
#13
Alexander M Whiticar, Erik K Mårtensson, Jesper Nygård, Kimberly A Dick, Jessica Bolinsson
Metal nanoparticles (NPs), in particular gold NPs, are often used in the fabrication process of semiconductor nanowires. Besides being able to induce the 1D crystallization of new material, it is highly beneficial if the NPs can be used to dictate the position and diameter of the final nanowire structure. To achieve well-defined NP arrays of varying diameter and pitch distances for nanowire growth, it is necessary to understand and control the effect that a pre-growth annealing process may have on the pre-defined NP arrays...
May 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28444822/triplex-dna-nanostructures-from-basic-properties-to-applications
#14
Yuwei Hu, Alessandro Cecconello, Andrea Idili, Francesco Ricci, Itamar Willner
Triplex nucleic acids attract recent interest as part of the rich "tool-box" of structures used to develop DNA-based nanostructures and materials. This review addresses the use of DNA triplexes to assemble sensing platforms and molecular switches. Furthermore, the pH-induced, switchable assembly and dissociation of triplex DNA-bridged nanostructures are presented. Specifically, the aggregation/deaggregation of nanoparticles and the reversible oligomerization of "origami" tiles or DNA circles are described. Also, the use of triplex-DNA structures as functional units to assemble pH-responsive systems and materials are presented...
April 26, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28443862/a-small-bandgap-semiconductor-p-type-mnv2o6-active-for-photocatalytic-hydrogen-and-oxygen-production
#15
Brandon Zoellner, Elijah Gordon, Paul A Maggard
Extensive research has been conducted with the goal to find a single bandgap material that can absorb visible light and efficiently drive the catalysis of water to both hydrogen and oxygen. The p-type MnV2O6 (C2/m, Z = 2, a = 9.289 Å, b = 3.535 Å, and c = 6.763 Å, β = 112.64°), synthesized via solid-state techniques, was investigated for its potential use in the visible-light photocatalysis of water. Mott-Schottky analysis was used to experimentally determine the energetic positions of the valence and conduction bands as +0...
April 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28443840/effect-of-incorporating-flat-aromatic-molecules-on-spherical-polymeric-nanoparticles
#16
Piyachai Khomein, S Thayumanavan
Flat aromatic structures are ubiquitous in organic semiconducting molecules. The possibility of endowing these inherently anisotropic molecules with isotropic structures is explored using a polymeric nanoparticle attachment strategy. Preliminary findings, outlined in this manuscript, suggest that this might be a simple and effective strategy for organic semiconductors with consistent mobilities.
April 26, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28443627/multifunctionality-of-silver-closo-boranes
#17
Mark Paskevicius, Bjarne R S Hansen, Mathias Jørgensen, Bo Richter, Torben R Jensen
Silver compounds share a rich history in technical applications including photography, catalysis, photocatalysis, cloud seeding and as antimicrobial agents. Here we present a class of silver compounds (Ag2B10H10 and Ag2B12H12) that are semiconductors with a bandgap at 2.3 eV in the green visible light spectrum. The silver boranes have extremely high ion conductivity and dynamic-anion facilitated Ag(+) migration is suggested based on the structural model. The ion conductivity is enhanced more than two orders of magnitude at room temperature (up to 3...
April 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28441752/photocatalytic-and-adsorption-performances-of-faceted-cuprous-oxide-cu%C3%A2-o-particles-for-the-removal-of-methyl-orange-mo-from-aqueous-media
#18
Weng Chye Jeffrey Ho, Qiuling Tay, Huan Qi, Zhaohong Huang, Jiao Li, Zhong Chen
Particles of sub-micron size possess significant capacity to adsorb organic molecules from aqueous media. Semiconductor photocatalysts in particle form could potentially be utilized for dye removal through either physical adsorption or photo-induced chemical process. The photocatalytic and adsorption capabilities of Cu₂O particles with various exposed crystal facets have been studied through separate adsorption capacity test and photocatalytic degradation test. These crystals display unique cubic, octahedral, rhombic dodecahedral, and truncated polyhedral shapes due to specifically exposed crystal facet(s)...
April 23, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28441498/thin-wall-gan-inaln-multiple-quantum-well-tubes
#19
Christophe Durand, Jean-François Carlin, Catherine Bougerol, Bruno Gayral, Damien Salomon, Jean-Paul Barnes, Joel Eymery, Raphael Butte, Nicolas Grandjean
Thin-wall tubes composed of nitride semiconductors (III-N compounds) based on GaN/InAlN multiple quantum wells (MQWs) are fabricated by metal-organic vapor-phase epitaxy in a simple and full III-N approach. The synthesis of such MQW-tubes is based on the growth of N-polar c-axis vertical GaN wires surrounded by a core-shell MQW heterostructure followed by in situ selective etching using controlled H2/NH3 annealing at 1010°C to remove the inner GaN wire part. After this process, well-defined MQW-based tubes having non-polar m-plane orientation exhibit UV light near 330 nm up to room temperature, consistent with the emission of GaN/InAlN MQWs...
April 25, 2017: Nano Letters
https://www.readbyqxmd.com/read/28441494/the-role-of-the-reducing-agent-in-the-electroless-deposition-of-copper-on-functionalized-sams
#20
Ashley Ann Ellsworth, Amy Victoria Walker
Metallized organic layer constructs have a wide range of technological applications. Electroless deposition is an attractive technique by which to deposit metal overlayers because it is inexpensive and can be performed low temperatures compatible with organic materials. Amine borane reducing agents are versatile which are capable of depositing metals, semiconductors and even insulators. We have investigated the role of amine borane reducing agents in the electroless deposition of copper on -CH3, -OH, and -COOH terminated SAMs adsorbed on gold using time-of-flight secondary ion mass spectrometry, optical microscopy and complementary MP2 calculations...
April 25, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
keyword
keyword
23707
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"