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."








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"Whether nanotechnology had ever showed up or not, electronics would have gotten there anyway," says Professor Saraswat. For the past four decades, the number of transistors that can be put on a chip, or equivalently, the number of information processing events that can be done per chip, has doubled every twenty-two months; concomitantly, the cost per processing event has dropped. Following this trend called Moore's Law, microelectronics has steadily settled into nanoelectronics in the past decade.
In your brain right now, a motor protein called kinesin is shuttling vesicles loaded with neurotransmitters to the synapses in your brain, allowing you to read this. While some researchers are trying to make similar molecular motors scoot around and throw switches on electronic chips, it's hardly certain these motors can ever do better than the electrical contacts that are routinely used today. The future of biological nanotechnology may not be clear, but what is, says Professor