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Tag: Silicon

New silicon device converts blue photons into red photons

New silicon device converts blue photons into red photons

Science
Dec. 2 (UPI) -- Researchers have developed a new hybrid device -- pairing silicon with organic, carbon-based molecules -- that can convert blue photons into red photons, paving the way for more efficient solar energy conversion. Silicon's electronic properties make it a popular choice for a variety of technologies. The material, one of Earth's most abundant, is used to make everything from semiconductors to solar cells. But silicon isn't great at turning light into electricity. While silicon can convert red photons into electricity just fine, its attempts to convert blue photons, which carry twice as much energy as red photons, yields mostly wasted thermal energy. For the new device, engineers paired silicon with a carbon-based material called anthracene that converts blue photons into r...
How Silicon Valley enables online slave markets

How Silicon Valley enables online slave markets

Technology
Media playback is unsupported on your device Drive around the streets of Kuwait and you won't see these women. They are behind closed doors, deprived of their basic rights, unable to leave and at risk of being sold to the highest bidder.But pick up a smartphone and you can scroll through thousands of their pictures, categorised by race, and available to buy for a few thousand dollars.An undercover investigation by BBC News Arabic has found that domestic workers are being illegally bought and sold online in a booming black market.Some of the trade has been carried out on Facebook-owned Instagram, where posts have been promoted via algorithm-boosted hashtags, and sales negotiated via private messages. ...