Photovoltaic, Infrared and UV
Experimental research is ongoing to develop methods of converting infrared and UV light into electrical power.
Since infrared solar radiation energy is radiated back from the earth during the night, a system to capture it could potentially provide energy 24 hours a day. Experiments have been done by university researchers in Idaho, Massachusetts, and Missouri into nanoantennas that can collect solar heat energy.
Since UV light is beyond the visible spectrum, UV solar panels can let the full spectrum of visible light through while still harnessing solar energy. Japan's National Institute of Advanced Industrial Science and Technology has shown proof of concept applications of this technology.