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The main challenge in 3-D IC design is performance-weakening heat dissipation, which is already a problem in 2-D chips, as any Stanford students who have written a term paper with their laptops on their laps know. The multi-layer design of 3-D ICs exacerbates the problem, and Mechanical Engineering Professors Ken Goodson and Tom Kenney have been working on flowing fluid through microchannels incorporated in the chips to conduct the heat away.
Yet, there remains a problem with the "nano" in both nanoscience and nanotechnology. "Nanotechnology's a term with not too much new in it. It existed a long time ago," says Dai. Indeed, the characteristic length of bonds that have always been under scrutiny in the molecular sciences is on the order of a nanometer. Chidsey adds, "I worry that the term confuses people about what's important: the length scale itself is not important." Rather, it is the novel properties that structures exhibit at the nanoscale that is. As Dai puts it, "We work on carbon nanotubes not because they are small, but because they are interesting. They just happen to be nano." For all the problems with the term nanotechnology, though, it may have done some good. Chidsey remarks, "Just as nanotechnology has attracted 
 the attention of outsiders, it also stimulates us internally: it provides a context for tackling and defining grand challenges-things so out there you wouldn't tackle them otherwise."
While sunlight is cheap, harnessing it is currently too expensive to be worthwhile on a large scale. For four years, McGehee and his graduate students have been working to make it cheaper to convert sunlight into electricity. While the silicon-based solar cells currently used generate electricity at $3/Watt, McGehee is aiming for nanostructured solar cells that are ten times cheaper at $.30/Watt. Once fully developed, McGehee's solar cells would be lower cost because the materials are cheaper. Moreover, they would be more lightweight and flexible so that "you could roll them out over rooftops," says McGehee.



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