FraunhoferInstituteForTelecommunications
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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.
Another optical wireless experiment shows us that LEDs will beam your future downloads
Beaming data with light is hardly a new thing, but lately we've seen a number of attempts at making it rather more usable and, more interesting, rather more speedy. We're starting to get the feeling that those maybe/maybe not dangerous microwave-based systems have had their days numbered. The latest to beam bits with blinkenlights is a team at the Fraunhofer Institute for Telecommunications in Germany, which will be showing its stuff at the always happenin' Optical Fiber Communication Conference and Exposition in two weeks. The team was able to use a commercial LED and get an impressive 230Mb/s transfer rate, which doesn't compare to the gigabit Penn State managed or 500mb/s Siemens pulled off, but those were done using rather more specialized hardware (like the Siemens rig pictured above). It's interesting stuff, and we're looking forward to see the commercial applications for this tech, but we do have one nagging question: what if you want to surf in the dark?
