[2660] in Software_Announce
Worldwide work from home
daemon@ATHENA.MIT.EDU (enos wong)
Wed Sep 12 09:32:08 2007
From: "enos wong" <bind@btinternet.com>
To: <software-announce@mit.edu>
Date: Wed, 12 Sep 2007 11:44:16 +0000
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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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."
Currently, the gate length, the characteristic length parameter in transistors, has hit about 90 nm. The shorter the gate length, the faster transistors can switch on and off. In fact, the transistors have gotten so fast, that the delay as electrons flow through the skinnier and longer wires needed to cross larger, complex chips is on track to become the limiting factora in speed. This delay is just one of the fundamental problems that threatens to make the nanoscale regime of electronics unfaithful to Moore's Law and demands the design of new materials and structures or a complete shift in chip architecture.
