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Edgy Look at 2D Molybdenum Disulfide

By Guest PostMay 23, 2014Science2d, african elephants, alan lightman, berkeley lab, boulder, catalyst, hidden valley, ivory experiment, kathryn zurek, molybdenum disulfide, mos2, nonlinear optics, pamela anomaly, photonic devices, sensitivity limits, university of colorado, xiang zhang, xiaobo yin, ziliang ye

Berkeley Lab Researchers Observe 1D Edge States Critical to Nanoelectronic and Photonic Applications

The drive to develop ultrasmall and ultrafast electronic devices using a single atomic layer of semiconductors, such as transition metal dichalcogenides, has received a significant boost. Researchers with the U.S. Department of Energy (DOE)’s Lawrence Berkeley National Laboratory (Berkeley Lab) have recorded the first observations of a strong nonlinear optical resonance along the edges of a single layer of molybdenum disulfide. The existence of these edge states is key to the use of molybdenum disulfide in nanoelectronics, as well as a catalyst for the hydrogen evolution reaction in fuel cells, desulfurization and other chemical reactions. (more…)

New Technique May Open Up an Era of Atomic-scale Semiconductor Devices

By Guest PostJune 2, 2013Scienceair, atomic scale, chun li, era, leds, light emitting diodes, linyou cao, molecules, molybdenum chloride, mos2, new technique, north Carolina, partial pressure, researchers, self limiting growth, semiconductor devices, solid atoms, state university, substrate, thin layer, vapor pressure, yifei yu

Researchers at North Carolina State University have developed a new technique for creating high-quality semiconductor thin films at the atomic scale – meaning the films are only one atom thick. The technique can be used to create these thin films on a large scale, sufficient to coat wafers that are two inches wide, or larger.

“This could be used to scale current semiconductor technologies down to the atomic scale – lasers, light-emitting diodes (LEDs), computer chips, anything,” says Dr. Linyou Cao, an assistant professor of materials science and engineering at NC State and senior author of a paper on the work. “People have been talking about this concept for a long time, but it wasn’t possible. With this discovery, I think it’s possible.” (more…)

Energy-momentum Spectroscopy: New Technique Could Improve Optical Devices

By Guest PostMarch 10, 2013Scienceangle, electronic excitations, energy momentum spectroscopy, grapheme, interference, jon schuller, keliang he, kymissis group, layered nanomaterials, leds, light absorbing devices, light emitting, molybdenum disulfide, mos2, new technique, optical devices, organic semiconductor, orientation of light, polarization, ptcda, rainbow colors, rashid zia, sinan karaveli, solar cells, source, theanne schiros, thin films, two dimensional material

Understanding the source and orientation of light in light-emitting thin films — now possible with energy-momentum spectroscopy — could lead to better LEDs, solar cells, and other devices that use layered nanomaterials.

PROVIDENCE, R.I. [Brown University] — A multi-university research team has used a new spectroscopic method to gain a key insight into how light is emitted from layered nanomaterials and other thin films.

The technique, called energy-momentum spectroscopy, enables researchers to look at the light emerging from a thin film and determine whether it is coming from emitters oriented along the plane of the film or from emitters oriented perpendicular to the film. Knowing the orientations of emitters could help engineers make better use of thin-film materials in optical devices like LEDs or solar cells. (more…)

Researchers Create Semiconductor ‘Nano-Shish-Kebabs’ With Potential for 3-D Technologies

By Guest PostMarch 1, 2013Science3 d devices, 3 d structure, chun li, crystalline layers, crystalline structure, crystals, electric charges, germanium sulfide, ges, ges nanowire, heterostructure, large surface area, linyou cao, miaofang chi, molybdenum sulfide, mos2, nano shish kebab, nanoscale structure, next generation sensors, next generation supercapacitors, north Carolina, one dimensional nanowire, photodetectors, photonic properties, researcher, semiconductor, solar cells, state university, three dimensional technologies, two dimensional nanosheets, weak oxidation, yifei yu

Researchers at North Carolina State University have developed a new type of nanoscale structure that resembles a “nano-shish-kebab,” consisting of multiple two-dimensional nanosheets that appear to be impaled upon a one-dimensional nanowire. However, the nanowire and nanosheets are actually a single, three-dimensional structure consisting of a seamless series of germanium sulfide (GeS) crystals. The structure holds promise for use in the creation of new, three-dimensional (3-D) technologies.

The researchers believe this is the first engineered nanomaterial to combine one-dimensional and two-dimensional structures in which all of the components have a shared crystalline structure. (more…)

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Edgy Look at 2D Molybdenum Disulfide

New Technique May Open Up an Era of Atomic-scale Semiconductor Devices

Energy-momentum Spectroscopy: New Technique Could Improve Optical Devices

Researchers Create Semiconductor ‘Nano-Shish-Kebabs’ With Potential for 3-D Technologies