Charge your phone with a beach towel

 作者:左它饰     |      日期:2017-04-07 01:01:00
By Helen Knight YOU’RE lying on the beach listening to music, and the battery in your MP3 player is running low. Not to worry: you can simply plug it into your towel for some extra juice. That scenario might not be far off thanks to inexpensive spray-on solar cells that can be applied to almost any surface, from plastic to fabrics. Conventional solar cells are expensive to make. One type, for example, is made using a technique called vapour deposition, in which a photovoltaic material is laid down on a surface at very high temperatures,