A solar cell structure includes silicon nano-particle diffusion regions. The diffusion regions may be formed by printing silicon nano-particles over a thin dielectric, such as silicon dioxide. A wetting agent may be formed on the thin dielectric prior to printing of the nano-particles. The nano-particles may be printed by inkjet printing. The nano-particles may be thermally processed in a first phase by heating the nano-particles to thermally drive out organic materials from the nano-particles, and in a second phase by heating the nano-particles to form a continuous nano-particle film over the thin dielectric.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 The invention described herein was made with Governmental support under contract number DE-FC36-07GO17043 awarded by the United States Department of Energy. The Government may have certain rights in the invention.