yeah probably special solar panels to accept such intense light, but also, i saw a heat-into-elctricity cell. I don't know what it is called, but some one stuck some to an led flashlight so you could use your body heat to powere the flashlight.
HA - Thats how i used to think a light saber worked.
Its a flat (dull?) panel aobut an inch by three inches. I think they also make little units about the size of a bubba chewing gum, you can heat them up and they produce electricity.