August 21, 2008 presentation by Stacey Bent for the Stanford University Office of Science Outreach’s Summer Science Lecture Series.  Meeting the world's growing energy needs in a sustainable fashion is one of the most pressing problems of our time. Professor Bent introduces the scope of the energy problem and some of the options for sustainable energy, then will focus on two main devices: solar cells and fuel cells. Solar cells convert the energy of the sun directly into electricity, while fuel cells convert chemical energy directly into electricity. Current research at Stanford is studying the use of new materials to develop the next generation of solar cells and fuel cells.