Engineers from South Korea has developed a very thin, bendable solar cells that can be wrap around an average pencil.
The flexible Photovoltaics could be used to power next-gen wearable technology such as fitness trackers and the likes. It is thin enough to wrap around a pencil and is efficient and durable compared to existing thicker ones.
The photovoltaic cell created is 1 micrometer thick, which is about a millionth of a meter. Thinner than the average human hair.
Engineers from the Gwangju Institute of Science and Technology in South Korea used the semiconductor gallium arsenide, which they directly stamped the cells into a flexible substrate without addition of any adhesive. Then it was ‘cold welded” to the electrode on the substrate. And the photoresist was removed to have a direct to direct metal bond. The metal bottom serves as a reflector for stray photons.
The tests shows that it is efficient as thicker solar cells that it could wrap around in object with radii up to 1.4 millimeters small and could be less fragile.