In Finland, VTT has now developed a biodegradable solar cell module power source in an international green electronics research project. The solar cell module developed by VTT is so small and light that it can be attached directly to, for example, the stem of a cultivated plant or a large leaf. The cell is approximately the size of a credit card, very flexible and extremely thin. After the growing season, the cell decomposes along with the rechargeable power supply that the cell charges.
