Austrian and Japanese researchers on Wednesday unveiled solar cells thinner than a thread of spider silk that are flexible enough to be wrapped around a single human hair.
The thin-film device, comprising electrodes on a plastic foil, is about 1.9 micro-metres thick, a tenth the size of the thinnest solar cells currently available, the researchers said.
One micro-metre is one millionth of a metre (3.3 feet).
"The total thickness of this device is less than a typical thread of spider silk," the researchers said in a report carried by online science journal Nature Communications.
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