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Perfect colors, captured with one ultra-thin lens: No need for color correction -- Harvard physicists' flat optics, using nanotechnology, get it right the first time
Most lenses are, by definition, curved. After all, they are named for their resemblance to lentils, and a glass lens made flat is just a window with no special powers.
Penn researchers develop new technique for making molybdenum disulfide: Extra control over monolayer material with advantages over graphene
Graphene, a single-atom-thick lattice of carbon atoms, is often touted as a replacement for silicon in electronic devices due to its extremely high conductivity and unbeatable thinness. But graphene i...
New nanogel for drug delivery: Self-healing gel can be injected into the body and act as a long-term drug depot
Scientists are interested in using gels to deliver drugs because they can be molded into specific shapes and designed to release their payload over a specified time period. However, current versions a...
Bar-Ilan U. researcher first to observe 'god particle' analogue in superconductors: Introduces 'tabletop' technique for examining the standard model of physics' most celebrated missing link
The Nobel Prize-winning discovery of the Higgs boson - the "God particle" believed responsible for all the mass in the universe - took place in 2012 at CERN's Large Hadron Collider, an underground fac...
Researchers build atomically thin gas and chemical sensors: Sensors made of molybdenum disulfide are small, thin and have a high level of selectivity when detecting gases and chemicals
The relatively recent discovery of graphene, a two-dimensional layered material with unusual and attractive electronic, optical and thermal properties, led scientists to search for other atomically th...
Iranian researchers succeeded in designing of a biosensor to determine dopamine level, which has high detection limit and decreases clinical diagnosis costs due to its high accuracy and speed.
AXT would like to announce its new partnership with NT-MDT, one of the world's leading manufacturers of Atomic Force Microscopes (AFM). NT-MDT has been involved in the producing instrumentation for na...
Keysight Technologies to Demonstrate In-circuit, Functional, Boundary Scan Test Solutions at IPC APEX EXPO
Keysight Technologies, Inc. (NYSE: KEYS) will demonstrate in-circuit, functional and boundary scan test solutions at IPC APEX EXPO, Booth 3815, San Diego Convention Center, Feb. 24-26.
North America dominated the global gold nanoparticles market accounting for over 30% of global volume in 2013.
(with video) New method might be used to make plasmonic photonic crystals, optoelectronic on-chip interconnects and chemical and biological sensors.
Interlocked rings switch from one catalytic state to another thanks to an external trigger.
The structures, which are only around 10-40 atoms thick, might be used in semi-transparent devices, such as displays, and in flexible electronics.
While carbon nanotubes (CNTs) have long attracted interest for nanoscale electronics, practical deployment of the technology requires a level of device consistency that is still a long way from being achieved. Now researchers at IBM in the US have identified the main source of device variability in CNT transistors and ways of reducing it. In recent years, silicon transistors have been fast approaching their minimum size. Short channel effects and increasing chip power density may halt the trend in constantly decreasing transistor sizes described in 'Moores Law'. Fortunately, there is an alternative. "The goal of our research is to develop carbon nanotube transistors into a practical technology that can replace silicon in future generations of high-performance microprocessor chips," says Qing Cao (http://researcher.ibm.com/researcher/view.php?person=us-qcao), who led the IBM research team behind these latest results. Carbon nanotubes have excellent short channel control, a low resistivity between the CNTs and metal contacts, and transport behaviour that allows much lower power consumption for the same on-current density. However where they have fallen short so far is in the uniformity between CNT devices. "Ultimately we want to integrate billions of nanotube transistors into functional circuits," says Cao. "To do this, we need good consistency from one transistor to the next, so they can all work together at the same voltage." Their latest study demonstrates that the device variability does not originate from the nanotubes themselves, and that it may be reduced by improved deposition processes and better materials for the dielectric components.Finding the root of the problem The researchers fabricated hundreds of bottom-gated field-effect transistors, each made from a p-channel single-walled CNT with a 10nm HfO2 layer deposited as the gate dielectric. Systematic experiments with the devices identified the amount of variability from device to device. The measurements also confirmed that variation in carbon nanotube diameter was not a dominant source of variability in device performance. The IBM team then built pairs of devices, where the same nanotube was used as the channel for both transistors. Observations of the performance of device pairs revealed that the dominant source was random, and so likely material-related rather than a systematic process-related contribution. Further analysis indicated that trapped charges fixed at the oxide/air interface were the prime suspect. "I think the results show that it is possible to build practical circuits based on nanotube transistors, but we still need to reduce the variability by several-fold," Cao tells nanotechweb.org. "We have identified the major source as the oxide surface, not anything intrinsic to the nanotubes, so we think we can make it happen with a better fabrication process." He suggests that the variability may be reduced by better control over the nanotube source and the deposition process. "The current nanotube solution isnt really electronic grade, so we may introduce charges on the oxide during the nanotube deposition process," says Cao. He also suggests that using high quality dielectrics with no free surface near the nanotube may also help. From working to working well Cao describes how far CNT electronics has come in the past few decades. "In the beginning, it was an achievement just to make a few good transistors," he says. The fabrication techniques for these devices are now so advanced that it is possible to fabricate a large enough number of high-quality semiconducting nanotubes to study their random behaviour. He adds, "As it gets closer to becoming a practical technology, the device variability becomes an increasingly important issue." Next the team will work to try and find where the trapped charges come from, and whether they are mainly from dangling bonds at the oxide surface, damage to the oxide during the fabrication process, or residue left by the nanotube solution do that they can eliminate them. Full details are reported in nanotechweb.org (http://nanotechweb.org/cws/article/tech/60243)
Categories: National Nanomanufacturing Network
A study of carbon nanotube transistors identifies the origin of device variability and ways to improve it.
United Nanotech Innovations Lists Materials for Trade on INSCX Exchange and Appoints Fullerex as Merchant
United Nanotech Innovations Pvt Ltd. (UNIPL), Bangalore, India a part of UAE based Darwish Bin Ahmed Group has formally joined INSCX Exchange, the world marketplace for nano-materials, polymers, TiO2...
Arrowhead Research Corporation (NASDAQ: ARWR), a biopharmaceutical company developing targeted RNAi therapeutics, today announced that Arrowhead's chief operating officer Bruce Given, M.D., will prese...
Insight into inner magnetic layers: Measurements at BESSY II have shown how spin filters forming within magnetic sandwiches influence tunnel magnetoresistance -- results that can help in designing spintronic component-
In doing so, the teams enhanced our understanding of processes that are important for future TMR data storage devices and other spintronic components. Their results have now been published in Nature C...
Imagine taking a fullerene (C60) and cutting it in half like a melon. What you get is a corannulene (C20H10), a molecule that, according to a just-published study conducted with SISSA's collaboration,...
Researchers at the University of Illinois at Urbana-Champaign have developed a unique single-step process to achieve three-dimensional (3D) texturing of graphene and graphite. Using a commercially ava...
A rapid extension of nanographene sheets from readily available hydrocarbons: Precisely controlled synthesis of structurally uniform carbon sheets could advance nanographene materials science
Commercially available hydrocarbons were used as templates to synthesize uniform nanographene sheets using a series of sheet extending agents and a new transition metal catalyst, which were developed...