Industrial scientists have devised a way to coat wafers of silicon, the stuff of the microelectronics revolution, with a high-performance semiconductor whose wider use could be a boon to many areas of electronics. Mating silicon to gallium arsenide, which currently shows up in special applications, has been a technological goal for more than 30 years.
If the fabrication advance announced this month by Motorola in Schaumburg, Ill.,
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