Quick background - there are two principal types of solar cell in common use.

Crystalline solar cells are highly efficent but are expensive because of the energy and special equipment needed to make crystalline silicon wafers.

Amorphous silicon cells use cheaper noncrystalline silicon but the drawback is these cells are far less efficient than crystalline cells.

Now a reseacher at Los Alasmo has found out how to cheaply deposit a layer of crystalline silicon on an amorphous silicon base prducing cells almost as efficient as crystalline silicon cells at a much lower cost.

http://www.renewableenergyaccess.com...543? id=45919

http://www.lanl.gov/orgs/tt/pdf/tech...u%20silicon%22

If this process works as advertised, solar power probably just got as cheap as natural gas and wind power.