TheWorldJournal.com

Strained Silicon Technology
By Dan Calloway, TheWorldJournal.com

IBM and Intel have found new ways to make computer chips run even faster. Both IBM and Intel have unveiled research that promises to lead to faster computers in the near future.

IBM has boosted chip speed by stretching the components, and Intel has found a way to make transistors smaller than ever before.

These breakthroughs could mean that chip makers can rely on existing manufacturing methods for longer than previously thought.

Typically, chipmakers try to improve performance by making components smaller, but IBM has bucked this trend with its "strained silicon" approach.

As its name implies the "strained silicon" approach stretches the material used in key components. Silicon chips are made of layers of different materials that form their components. The atoms in the different layers have a natural tendency to line up with each other.

IBM has discovered that if it uses a base layer with atoms slightly farther apart than usual, the silicon laid on top of it is deformed or "strained" as its atoms seek to sit on top of their counterparts. Electrons slip through strained silicon up to 70% faster because they experience less resistance. The result could be chips up to 33% faster than today's fastest chips. IBM claims the strained silicon process is not expensive or difficult to work into production lines, and said it could be used commercially as soon as 2003. Some problems to solve before that date include ensuring that the strained layer and the silicon above meet uniformly so there are no dislocations between atoms.

IBM made its announcement about strained silicon in Kyoto Japan in early June. Intel also unveiled research that it claims will lead to processors 1000% faster than those we use today.

Intel has found a way to make transistors--the key component on a computer chip--smaller than ever. The Intel researchers say they have managed to make working transistors 70-80 atoms wide and just 3 atoms thick.

Eventually, Intel claims it will be able to fit 1,000,000,000 of these transistors on to a chip, producing a processor that works at a speed of 20Ghz. By contrast, Intel's latest Pentium 4 chips work at a relatively modest 1.7Ghz.

The technology should mean that the ultimate limit for the size of components on computer chips would not be reached until early in the second decade of this century.

Intel expects to be making chips with the tiny transistors onboard by 2007.

Moor's Law states that the number of transistors on a chip doubles every 18 months as manufacturers find ways to make components ever smaller. But it has long been known that this shrinking process cannot go on forever.

Eventually, components will get so small that they stop working in a predictable manner as they become susceptible to quantum effects. At that point, chipmakers will have to find other ways to make more powerful processors.

© June 13, 2001