Typical solar cells are very, very thin. The frame is thick, but the actual cells, the blue areas, are thinner than your average window pane. The substrate is a fragile glass, and the actual 'cell' part is just a film on the glass. So any tungsten used would have to be very thin as well. Tungsten is heavy, just very slightly less heavy as gold................
I am still waiting for algae oil and new advances in energy storage.