Here's a "Photocapacitor" aka solar cell and battery combined by Japanese reseacher in Aoba, Yokohama near my house, He has put a solar cell and a battery into one structure..
A new type of solar cell
physicsweb.org / 4 November 2004 (Appl. Phys. Lett. 85 3932).
Scientists in Japan have made the first device that can convert solar energy into electricity and then store the resulting electric charge. The "photocapacitor" designed by Tsutomu Miyasaka and Takurou Murakami at Toin University in Yokohama could be used to power mobile phones and other hand-held devices ....