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18 Oct 2014
High-energy light is absorbed by a special organic coating that produces pairs of triplets that can be efficiently absorbed  by underlying inorganic solar cells.

High-energy light is absorbed by a special organic coating that produces pairs of triplets that can be efficiently absorbed
by underlying inorganic solar cells.R. 

Colin Johnson @ nextgenlog.blogspot.com:

Hybrid solar cells that harvest all of the suns energy, instead of just a few narrow bands, could transform the energy economies worldwide: R. Colin Johnson @EETimes

Hybrid Solar Cells Promise 95% Efficiency - [Link]

8 Oct 2014

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by DENNIS OVERBYE @ nytimes.com:

Three physicists have been awarded the Nobel Prize for revolutionizing the way the world is lighted.

The 2014 physics award went to Isamu Akasaki and Hiroshi Amano of Japan and Shuji Nakamura of the University of California, Santa Barbara, for “the invention of efficient blue light-emitting diodes, which has enabled bright and energy-saving white light sources.”

The three scientists, working together and separately, found a way to produce blue light beams from semiconductors in the early 1990s. Others had produced red and green diodes, but without blue diodes, white light could not be produced, the Royal Swedish Academy of Sciences said on Tuesday morning in its prize citation.

[via]

American and 2 Japanese Physicists Share Nobel for Work on LED Lights - [Link]

4 Oct 2014

by Applied Science @ yoututbe.com:

I describe how some materials can change temperature when a magnetic field is applied to them.

Magnetic refrigeration: How does that work?! - [Link]

1 Oct 2014

quickchangem

by Phys.org:

Faster, smaller, greener computers, capable of processing information up to 1,000 times faster than currently available models, could be made possible by replacing silicon with materials that can switch back and forth between different electrical states.

The present size and speed limitations of computer processors and memory could be overcome by replacing silicon with ‘phase-change materials’ (PCMs), which are capable of reversibly switching between two structural phases with different electrical states – one crystalline and conducting and the other glassy and insulating – in billionths of a second.

Quick-change materials break the silicon speed limit for computers - [Link]


17 Sep 2014

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by R. Colin Johnson @ nextgenlog.blogspot.com

It takes 100 crazy ideas to come up with one good one–like the finFET. Likewise, of the 100s of crazy ideas engineers are trying today, some will keep Moore’s Law alive indefinitely–or at least until we start using synthetic biological computers instead!). An optical emitter can be easily added to a III-V chip to make on-chip communications between electronics travel at the speed of light.

No End to Moores Law with III-V Gallium Arsenide Materials - [Link]

15 Sep 2014

buckyballrectifier-0

By Colin Jeffrey @ gizmag.com:

Scientists working at the Stanford Institute for Materials and Energy Sciences (SIMES) claim to have created a molecule-sized electronic component just a few nanometers long that conducts electricity in only the one direction. In essence, a rectifier diode, but one so small that it may one day help replace much bulkier diodes and other semiconductors found on today’s integrated circuits to produce incredibly compact, super-fast electronic devices.

Created using two unconventional types of carbon – Buckminsterfullerene (aka buckyballs, spherical molecules of carbon in a fused-ring structure) and diamondoids (microminiature nanoscale carbon cage molecules that are incredibly strong) – the resultant “buckydiamondoids” exhibit asymmetric conductance when an electric current is applied. That is, they act just like diodes in conducting electricity in one direction, but block it if it is applied from the other direction.

Buckyballs and diamondoids combined to create molecule-sized diode - [Link]

14 Sep 2014

NewImage127

Researchers say they have captured the sound of a single moving atom.

Researchers at Columbia University and Sweden’s Chalmers University of Technology say that they have, for the first time, “captured” the sound a single atom makes when it moves around—a single “phonon,” as it were. It’s an achievement that could eventually be used as the basic science for new quantum computing devices.

Like everyone is taught in elementary school, anytime something moves or vibrates, it makes a sound. Scientists now know for sure that that principle extends down to the lowly atom.

“The sound amplitude, or strength, is very weak,” said Göran Johansson, a co-author of the paper published today in Science. “Basically, when you excite the atom, it creates a sound, one phonon at a time, according to theory. It’s the weakest possible sound possible at the frequency [that it vibrates].”

Scientists Have Captured the Sound One Atom Makes - [Link]

11 Sep 2014

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Samsung funds Penn State to perfect the 3-D FinFET using III-V materials, which Samsung plans to use at the 5 nanometer node: R. Colin Johnson @NextGenLog

Samsung Finding U.S. Lab to Advance its 3-D FinFET to 5nm - [Link]

2 Sep 2014

color-sensitive-photodetector-cmos

By Richard Moss @ gizmag.com

Researchers at Rice University’s Laboratory for Nanophotonics (LANP) have developed a new image sensor that mimics the way we see color by integrating light amplifiers and color filters directly onto the pixels. The new design enables smaller, less complex, and more organic designs for CMOS (complementary metal-oxide semiconductor) sensors and other photodetectors used in cameras.

Conventional image sensors work by first converting light into electrical signals, then combining that information with the red, green, and blue color data determined by separate filters (or, especially in low-end cameras, a single filter array that uses a mosaic pattern to interpret colors). But this approach adds bulk to the sensor, and the filters gradually degrade under exposure to sunlight.

Nature inspires color-sensitive, CMOS-compatible photodetector - [Link]

28 Aug 2014

stanford-stable-lithium-anode

By Colin Jeffrey:

Stanford University researchers claim to have created the first stable pure lithium anode in a working battery by using carbon nanospheres as a protective sheath to guard against degradation. As a result, the researchers predict that commercial developments may eventually result in anything up to a tripling of battery life in the not-too-distant future.

At a basic level, a battery is composed of three main elements: the anode (the positive terminal), the cathode (the negative terminal), and the electrolyte (a solid or liquid chemical that stores electrical energy) which fills the battery between these two terminals. In ordinary Lithium-ion batteries, it is an all too common problem that the lithium in the battery can crystallize into dendrites – microscopic fibers that expand into the electrolyte, and can eventually short-circuit the battery, significantly reduce battery life or, worse, causing the battery to catch fire.

Stable lithium anode may triple battery efficiency - [Link]



 
 
 

 

 

 

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