photodetector
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Scientists use bilayer graphene to develop extra-sensitive photodetector
By now it goes without saying that graphene is something of a darling in the research community, with scientists using the material to develop transistors, batteries and circuits, among other devices. In 2011, MIT researchers discovered graphene's effectiveness as a photodetector, and a team at the University of Maryland has taken that line of thought a few steps further. By using bilayer graphene (two atoms thick instead of one atom thick), the scientists developed a temperature-sensitive device more than 1,000 times faster than existing technologies. Not to mention, it's capable of recognizing a very broad range of light energies, which means it could be useful in everything from biochemical weapons detection to airport body scanners. Still, the UMD researchers have their work cut out for them: the graphene photodetector has a high electrical resistance, and it will require tweaks to absorb enough light to be useful. Still, this is graphene we're talking about -- and we don't expect its popularity to wane any time soon.
MIT researchers suggest graphene could be used to build a better camera sensor
As you may have noticed from the pace of research over the past few years, graphene is promising to make a whole lot of things a whole lot better. Now, it seems, you can also add camera sensors to the list. A team of MIT researchers recently discovered that graphene can serve as a photodetector over a "very wide energy range," and that it works particularly well in infrared light, where other types of detectors often come up short. That, the researchers say, could open to the door to everything from better nightvision systems to more advanced detectors for astronomical telescopes -- not to mention more inexpensive camera sensors in general, since graphene is cheap to work with. What's more, the researchers also suggest that those same light-detecting abilities could make graphene a good material for collecting solar energy, although they note that there's still much more research needed to determine if it's truly an efficient means of generating energy.
