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In other applications of carbon nanotubes, Dai has Professor Michael McGehee is developing cheap and efficient nanostructured solar cells.








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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.
Materials: Carbon Nanotubes Dr. Hongjie Dai, Chemistry Slice a layer of pencil lead, roll it up, and you have a carbon nanotube: a graphene sheet (a layer of graphite) rolled up into a cylinder. "A carbon nanotube is a clever way of making a fully saturated nanowire structure-a 1-D structure with all its atoms fully bonded," explains Professor Dai, who has developed catalysts that control where carbon nanotubes grow. "The big challenge is controlling the synthesis. More control leads to definite physical properties," says Dai. In contrast to conventional semi-conductors, where "the surface atoms are not happily bonded," as Dai puts it, the high degree of structural perfection in nanotubes leads to ballistic transport of electrons, which translates into high speed electronics. Dai predicts 
 that while it is doubtful that carbon nanotubes will overtake the electronics industry, it is quite possible that they will replace some electronics components.