Scientists have shown ultra-thin photovoltaic cells, so flexible that they can bend and wrap around small objects like a pencil.
According to Kon Jongho Lee, engineer at Gwangju Institute of Science and Technology in South Korea, their thickness is about 1 micrometer, much thinner than the thickness of a medium human hair.
The researchers made these ultra-thin solar cells from gallium arsenic semiconductors. The cells are imprinted on a flexible substrate without the use of adhesive.
The energy efficiency of the new photovoltaic is similar to that of a much thicker photovoltaic. The photovoltaic film can be rolled around a thickness of just 1,2 millimeters, as the photo at the beginning of this article.