solarcell
Latest
AI-guided material changes could lead to diamond CPUs
Scientists know that you can dramatically alter a crystalline material's properties by applying a bit of strain to it, but finding the right strain is another matter when there are virtually limitless possibilities. There may a straightforward solution, though: let AI do the heavy lifting. An international team of researchers has devised a way for machine learning to find strains that will achieve the best results. Their neural network algorithm predicts how the direction and degree of strain will affect a key property governing the efficiency of semiconductors, making them far more efficient without requiring educated guesses from humans.
Matrix adds a solar cell to its battery-free smartwatch
In announcing the third in its range of battery-free smartwatches, Matrix Industries is going where few others have gone before. Whereas the first two PowerWatches relied upon thermocouples to generate power, the new model has two different ways to get energy. As well as drawing a charge from the heat on your wrist, the PowerWatch 2 will harvest solar radiation to keep itself going.
ICYMI: A soft robot sleeve to keep your heart going
try{document.getElementById("aol-cms-player-1").style.display="none";}catch(e){}Today on In Case You Missed It: A soft robotic device made by Harvard and Boston Children's Hospital researchers has been tested on pigs and so far, seems quite promising in treating heart disease. The robotic heart wraps around parts of existing tissue and helps squeeze, keeping the blood moving. But unlike other existing devices that are inserted into the heart, this just goes over the top. Its makers believe that will lead to better outcomes for patients that use it, since cycling blood through a medical device can lead to all kinds of complications, from infection to blood clots. No word yet on when they'll begin tests in humans.
Solar beads can make some very cool lamps and flashlights
Conventional solar panels aren't exactly the prettiest objects on the planet, which is why companies like Tesla, SRS Energy and SunTegra have been focusing on blending this technology into roof tiles. As for those who don't have a roof or land to spare, Japan's Kyosemi Corporation has come up with an alternative solution that can let windows and glass walls soak up solar power as well. The magic ingredient? Just a web of "Sphelar" solar cell beads -- each with a diameter of 1.2 mm -- lined up inside any transparent substrate, meaning it can come in any shape or form while letting light travel through the gap between beads. Better yet, due to the spherical nature of these cells, they can capture light from almost any angle -- to the point where they can deliver a higher cumulative output than their conventional counterparts, according to the company.
Solar cell generates power from raindrops
Rain is normally a solar energy cell's worst nightmare, but a team of Chinese scientists could make it a tremendous ally. They've developed a solar cell with an atom-thick graphene layer that harvests energy from raindrops, making it useful even on the gloomiest days. Water actually sticks to the graphene, creating a sort of natural capacitor -- the sharp difference in energy between the graphene's electrons and the water's ions produces electricity.
Moth eyes inspire solar cells that work indoors
As a rule, most solar cells need to catch direct sunlight. Even those that work indoors can only do so much to generate power from artificial light sources. However, British researchers have found a clever (and decidedly) unusual way to harvest energy while inside: by imitating moths. They've created a graphene-based material that traps electromagnetic waves much like a moth's eye, making it one of the most energy-absorbent substances to date. With the right antennas, it could produce energy from not just sunlight, but any device that emits microwave or radio waves -- your smartphone could help power your smartwatch.
Nanowires help produce hydrogen fuel using sunlight
You ideally want to produce clean hydrogen fuel using clean sources, and Dutch researchers have taken a big step toward making that a practical reality. They've built a solar cell that uses a grid of gallium phosphide nanowires to make hydrogen gas from water. The approach gets a useful yield of about 2.9 percent in lab tests. That may not sound like much, but it's about 10 times more effective than previous techniques and uses 10,000 times less exotic material.
Stacking solar cells leads to more efficient energy collection, lower bills
Thanks to the efforts of a North Carolina-based company, solar panels are about to get a lot more efficient. Semprius produces the collection devices by stacking materials on top of each other in order to catch more frequencies of light. In the process, cell stacking boosted efficiency to around 45 percent during tests. The new tech can be produced quickly using cells that are one millimeter across to reduce cooling needs while combining semiconductor materials and reusing the components cells are grown on. All of that will help Semprius achieve 50 percent efficiency in the next three to five years -- up from the current 25 percent range. Unfortunately, the new method will be quite expensive until demand warrants mass production. However, more efficient collection will lead to lower overall cost in the long run, and make solar power as cheap as that produced by natural gas facilities.
Solar cells cool themselves to produce more power
Solar power cells need to stay relatively cool for the sake of both efficiency and longevity, but active cooling (like ventilation) isn't practical; it's expensive, and may block the very rays the cells are supposed to collect. To tackle this problem, Stanford University researchers have created a new form of solar cell that cools itself. The technique embeds a pattern of very small cone and pyramid shapes into the collector's silica surface, bouncing hot infrared wavelengths away while letting in the visible light that generates the most energy.
Heat-sensitive solar cell could lead to much more on-demand energy
It's tough to build solar cells that capture both heat and light -- most of these multi-talented devices can't trap more than one percent of the energy they receive. However, MIT has just blown past that limitation with a prototype chip that absorbs warmth through an outer layer of carbon nanotubes. The tubing heats up photonic crystals so much that they glow with an intense light, giving an attached solar cell more energy than it would collect through sunlight alone. The technology is already efficient enough to extract 3.2 percent of the energy it gets, and MIT believes that it could reach 20 percent with more development. While that's not necessarily more effective than conventional technology, it's much easier to store heat than electricity; a future nanotube-based panel could provide a lot more on-demand energy than we typically get today. There's no estimate for when a finished product might reach the market, but it might not be long before solar panels have plenty of reserve power.
Stanford researchers create 'world's first' all-carbon solar cell, do it on the cheap
Harnessing the awesome power of the Sun isn't just dependent on the efficiency of solar cells, but also on making them affordable. Current techniques aren't exactly cheap, but researchers from Stanford University think they've made a bit of a breakthrough by producing a relatively inexpensive photovoltaic cell using nothing but carbon. We're sure other scientists might disagree with the 'world's first' claim, but those at Stanford think it's a matter of language, and that these other pretenders are "referring to just the active layer in the middle, not the electrodes." The team selected a trio of carbon types to use in their cell: a mixture of nanotubes and buckyballs make up the light-absorbing layer, while graphene is being utilized for the electrodes. The carbon amalgam can be applied from solution using simple methods, meaning the flexible cells could be used to coat surfaces, although you won't be seeing it smeared over anything too soon. The prototype only touts a "laboratory efficiency of less than 1 percent," so it can't compete with traditional solar cells just yet. Also, it only absorbs a sliver of the light spectrum, but the researchers are looking to other forms of the wonder element which could increase that range. They are hoping that improving the structure of the cells will help to boost their efficiency, too. They might never generate the most energy, but the all-carbon cells can remain stable under extreme conditions, meaning they could find their calling in harsh environments where brawn is a little more important than status, or looks.
NC State nanoflowers can boost battery and solar cell capacity, make great prom accessories
We see a lot of sleek-looking technology pass through our doors, but it's rare that the inventions could be called beautiful by those who aren't immersed in the gadget world. We'd venture that North Carolina State University might have crossed the divide by creating an energy storage technology that's both practical and genuinely pretty. Its technology vaporizes germanium sulfide and cools it into 20-30 nanometer layers that, as they're combined, turn into nanoflowers: elegant structures that might look like the carnation on a prom dress or tuxedo, but are really energy storage cells with much more capacity than traditional cells occupying the same area. The floral patterns could lead to longer-lived supercapacitors and lithium-ion batteries, and the germanium sulfide is both cheap and clean enough that it could lead to very efficient solar cells that are more environmentally responsible. As always, there's no definite timetable for when (and if) NC State's technology might be commercialized -- so call someone's bluff if they promise you a nanoflower bouquet.
Fraunhofer black silicon could catch more energy from infrared light, go green with sulfur
Generating solar power from the infrared spectrum, or even nearby frequencies, has proven difficult in spite of a quarter of the Sun's energy passing through those wavelengths. The Fraunhofer Institute for Telecommunications may have jumped that hurdle to efficiency through sulfur -- one of the very materials that solar energy often helps eliminate. By irradiating ordinary silicon through femtosecond-level laser pulses within a sulfuric atmosphere, the technique melds sulfur with silicon and makes it easier for infrared light electrons to build into the frenzy needed for conducting electricity. The black-tinted silicon that results from the process is still in the early stages and needs improvements to automation and refinement to become a real product, but there's every intention of making that happen: Fraunhofer plans a spinoff to market finished laser systems for solar cell builders who want their own black silicon. If all goes well, the darker shade of solar panels could lead to a brighter future for clean energy.
Spherical glass lens concentrates sunlight by up to 10,000 times, boosts solar cell efficiency
Eking out more power from solar cells is an ongoing challenge for scientists, and now architect André Broessel has developed a spherical glass energy generator that's said to improve efficiency by 35 percent. Acting as a lens, the rig's large water-filled orb concentrates diffused daylight or moonlight onto a solar cell with the help of optical tracking to harvest electricity. In certain configurations, the apparatus can be used for solar thermal energy generation and even water heating. In addition to the oversized globe, Broessel has cooked up a mobile version of the contraption for domestic use and an array of much smaller ball lenses with dual-axis tracking that offers 40 percent efficiency. These devices aren't the first venture into concentrated photovoltaics, but they are likely among the most visually impressive. If the Barcelona-based architect's vision of the future comes true, you'll be seeing these marbles incorporated into buildings and serving as standalone units. Hit the source links below for the picture spread of prototypes and renders.
Researchers make unsuitable parts work as solar cells, could lead to cheaper panels
Harnessing the power of the sun is a tricky business, but even the past few weeks have seen some interesting developments in the field. In this latest installment, researchers from the Lawrence Berkeley National Laboratory and the University of California have figured out a way of making solar cells from any semiconductor, potentially reducing the cost of their production. You see, efficient solar cells require semiconductors to be chemically modified for the current they produce to flow in one direction. The process uses expensive materials and only works with a few types of semiconductors, but the team's looking at using ones which aren't normally suitable -- the magic is to apply an electrical field to them. This field requires energy, but what's consumed is said to be a tiny fraction of what the cell's capable of producing when active, and it means chemical modification isn't needed. The concept of using a field to standardize the flow of juice isn't a new one, but the team's work on the geometrical structure of the cells has made it a reality, with a couple of working prototypes to satisfy the skeptics. More of these are on the way, as their focus has shifted to which semiconductors can offer the best efficiency at the lowest cost. And when the researchers have answered that question, there's nothing left to do but get cracking on commercial production. For the full scientific explanation, hit up the links below.
Researchers create record-breaking solar cell, set bar marginally higher
Solar cell development is typically a small numbers game, and a group of researchers at the University of Toronto have managed to eke out a few more percentage points in efficiency with a new record-breaking cell. Setting a high mark for this type of cell, the team's Colloidal Quantum Dot (CQD) film harvests both visible and non-visible light at seven percent efficiency, a 37 percent increase over the previous record. The breakthrough was achieved by leveraging organic and inorganic chemistry to make sure it had fewer nooks and crannies that don't absorb light. With the advantages of relatively speedy and cheap manufacturing, the technology could help lead the way for mass production of solar cells on flexible substrates. In the meantime, check out the source for the scientific lowdown.
Inhabitat's Week in Green: 3D printed boat, algae-based biofuel and a bus that does push-ups
Each week our friends at Inhabitat recap the week's most interesting green developments and clean tech news for us -- it's the Week in Green. The Olympic flame completed its tour through the UK this week as the 2012 Summer Games officially kicked off on Friday, and all eyes have been on London ever since. All week long we've been focusing on the Olympics, beginning with an overview of London's new Olympic Park, which is headlined by the Zaha Hadid-designed Aquatics Centre, and Anish Kapoor's controversial ArcelorMittal Orbit observation tower. For a deeper look at the venues that will be on display at the Olympics over the next two weeks, check out our roundup of the top six green buildings at the Olympics. In addition to the sports stadiums, Olympics visitors will also be treated to the sights and sounds of Coca-Cola's multi-sensory Beatbox Pavilion, an interactive sound and light display that responds to touch. But the art installation that we're most excited about is the one by artist David Cerny, who retrofitted a 6-ton London double-decker bus with a gigantic pair of human arms. Best of all, the arms are motorized, enabling the bus to do push-ups.
UCLA creates transparent solar cell, dreams of current generating windows
Transparent photovoltaics have yet to grace the face of your smartphone, but don't give up hope -- UCLA researchers are working on a new see-through solar cell that's showing potential. Using a new type of polymer solar cell, the team has been able to build a device that converts infrared light into electrical current. Current prototypes boast 4 percent energy conversion efficiency at 66 percent transparency -- not crystal clear, but certainly clean enough to peer through. According to a study in ACS Nano, the technology could be used in "building-integrated photovoltaics or integrated photovoltaic chargers for portable electronics." Translation? It could one day be used to build solar windows or better sun collecting smartphones. Don't get too excited though, the technology still has a ways to go before any of these dreams come to fruition. Still, feel free to head past the break for the team's official press release, or skip to the source to take in the full academic study.
BAE Systems designs hard composite solar cells: could act as structure of UAVs, piece of soldier's gear
BAE Systems revealed that it's working on hardy, high-capacity solar cells that could power unmanned vehicles and even attach to an individual soldier's gear. According to Darren Buckle, a manager from BAE Systems' Advanced Technology Center, the cells are geared toward smaller, often airborne, military units, where weight is at a premium. The system, still in the development stage, could offer up power for heavy endurance unmanned air vehicles, provided the cells are made sensitive enough to absorb energy in less sunny situations -- something that the company's England-based engineers are currently contending with.
All-carbon solar cell draws power from near-infrared light, our energy future is literally that much brighter
What's this orange-like patch, you ask? It's a layer of carbon nanotubes on silicon, and it might just be instrumental to getting a lot more power out of solar cells than we're used to. Current solar power largely ignores near-infrared light and wastes about 40 percent of the potential energy it could harness. A mix of carbon nanotubes and buckyballs developed by MIT, however, can catch that near-infrared light without degrading like earlier composites. The all-carbon formula doesn't need to be thickly spread to do its work, and it simply lets visible light through -- it could layer on top of a traditional solar cell to catch many more of the sun's rays. Most of the challenge, as we often see for solar cells, is just a matter of improving the energy conversion rate. Provided the researchers can keep refining the project, we could be looking at a big leap in solar power efficiency with very little extra footprint, something we'd very much like to see on the roof of a hybrid sedan.
