About the Author: Professor Sergio Pizzini is Chairman of NED SILICON SpA, a company which focuses on renewable energies. He is retired from the University of Milano-Bicocca, where he was a Professor of Physical Chemistry until 2008. He also held positions as Director of the Nanotechnology Science Doctorate and Director of the Doctorate School of the Faculty of Sciences at the University.Professor Pizzini is currently a member of the Scientific Committee of the Solar Lab, a joint initiative of the University of Camerino, Department of Physics and of Renergies Italia, Spa. His scientific expertise spans from semiconductor physics and chemistry to surface defect science and silicon processes for photovoltaic uses. He is the author or co-author of four books as well as more than two hundred technical papers.