It's easy to define and describe a nanometer: a nanometer is a billionth of a meter. That's a millionth of a pinhead, a thousandth of a red blood cell diameter, or the length of a line of ten hydrogen atoms rubbing shoulders. If only knowing what nanotechnology really means were as simple: "Have you heard the story of the elephant and the blind man?" Professor Krishna Saraswat chuckles. "Nanotechnology has different meanings to different people, but the conventional definition is the science of material patterned at the 1-100 nm length scale," notes Professor Michael McGehee. Professor Chris Chidsey muses, "Nanotechnology is a concept that is largely designed to capture people's imagination rather than describe a particular type of research. It's largely an attempt to portray a unified vision for a pretty wide-ranging group of activities that might not otherwise get recognized."





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McGehee makes his solar cells by mixing a titania gel precursor and a special semiconducting polymer, which self-assemble into titania (TiO2) films with polymer-filled pores 20 nm in diameter. Currently, McGehee is still working to improve the efficiency of his solar cells and their resistance to degradation over time in sunlight. "Right now, we're at 2% efficiency, and we want to get to 15%." 15%? That might seem low, but silicon-based cells operate at 12% efficiency, and most importantly, as McGehee points out, "there's a lot of sunlight out there."