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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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 A decade ago, Saraswat's research group was the first to begin developing a new kind of chip architecture: the 3-dimensional integrated circuit (3-D IC). Compared to the 2-D planar chips in computers today, 3-D chips can provide the same processing power with a reduced chip surface area. Also, instead of having long, twisting highways of wires, the stacked chips in 3-D ICs allow for short wires much like elevator shafts, as Professor Chidsey puts it-mitigating the problem of delay in the wires. Moreover, 3-D IC architecture allows the integration of all kinds of chips, since chips that require different technologies or materials can be stacked together. Received on Sat Sep 15 2007 - 14:17:25 EDT
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