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Re: FreeGrass post# 27249

Thursday, 07/24/2014 10:47:09 AM

Thursday, July 24, 2014 10:47:09 AM

Post# of 104389
It looks like 0.30 is holding...

I wonder where Sony is getting their Quantum Dots from...
Sony XBR-65X950B (USA) 4K TV Review
Sony’s Triluminos, which is the company’s name for wide color gamut (WCG) technology (apparently this year running from an in-house Sony solution rather than licensed quantum dot technology)

Quantum dots boost conversion efficiency of GaAs Solar cells
A team of scientists from Taiwan has shown that adding CdS or CdSe quantum dots (QDs) to GaAs solar cells could increase their efficiency by nearly 25 percent. The results were reported in Nature last week.

GaAs-based single-junction solar cells already hold the photovoltaic world record for the highest power conversion efficiency (PCE) at 28.8 percent. Boosting conversion efficiency in GaAs solar cells further requires reducing surface reflection and using the full solar spectrum, especially in the ultraviolet (UV) range.

Clearing the way for extremely efficient solar cells: First ab initio method for characterizing hot carriers
"This means that we can study hot carriers in a variety of surfaces, nanostructures, and materials, such as inorganic and organic crystals, without relying on existing experiments," says Neaton. "We can even study materials that have not yet been synthesized. Since we can access structures that are ideal and defect-free with our methods, we can predict intrinsic lifetimes and mean free paths that are hard to extract from experiments due to the presence of impurities and defects in real samples. We can also use our model to directly evaluate the influence of defects and impurities."

"We believe our approach is highly valuable to experimental groups studying hot carriers in the context of solar cells and other renewable energy technologies as it can be used to compute the lifetime and mean free path of hot carriers with specific energies, momenta, and crystallographic directions with unprecedented resolution," Bernardi says. "As we expand our study of hot carriers to a range of crystalline materials and nanostructures, we believe that our data will provide unique microscopic insight to guide new experiments on hot carriers in semiconductors."

Halide ligands help make all-inorganic devices
The Chicago-Argonne researchers have now studied simple halides, such as NH4I, NH4Br, NH4Cl and even NaCl and KBr as inorganic ligands for colloidal nanocrystals. Similar to other such ligands, these halide ions bind to the electrophilic nanocrystal surface and stabilize the crystals electrostatically in solution. The halide ligands are rather simple and short, and are stable in air and humid atmospheres, as well as being less toxic than chalcogen-based ligands. And, because they are so short and compact, they enhance charge transport between nanocrystals – as seen in the high mobility of 12 cm2/Vs in thin films made of iodide-capped CdSe nanocrystals. They also passivate surface dangling bonds and remove electronic traps from the nanocrystal surface.

Quantum leap in lasers brightens future for quantum computing
Scientists have devised a breakthrough laser that uses a single artificial atom to generate and emit particles of light. The laser may play a crucial role in the development of quantum computers, which are predicted to eventually outperform today's most powerful supercomputers.

A crystal wedding in the nanocosmos may lead to fast multi-functional processing units on single chip
Researchers have succeeded in embedding nearly perfect semiconductor crystals into a silicon nanowire. With this new method of producing hybrid nanowires, very fast and multi-functional processing units can be accommodated on a single chip in the future.

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