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Technology Stocks : Wolf speed

WOLF 18.63

-1.3%

Jan 9 3:59 PM EST

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To: Don Green who wrote (5248)	3/26/2001 10:54:30 PM
From: jbkelle	Read Replies (1) of 10714

Don, The CREEtins got CREE'd...They thought that SiC was the only path to the holy grail of deep blue LEDs... Silicon Carbide Electronic Devices and Scientific Barriers Dale M. Brown (GE Corporate Research amp; Development, Schenectady, NY) The status of SiC devices will be described together with the technical roadblocks standing in the way of further progress. Although the quality of SiC wafers continues to improve, the linkage with device feasibility (e.g. reproducibility of device parameters, reliability, yield) required to spur work for solving important problems is weak. SiC LEDs (now being supplemented by GaN LEDs) and SiC photodiodes remain as the only two production items to date. The introduction of SiC microwave power devices for the lower frequency bands may occur but large low frequency power devices that can operate at high voltage, current and temperatures will require considerable work on many fronts. The work done on small devices for SiC ICs has uncovered many barriers. Long term reliability of dielectrics required for all types of MOS devices has yet to be improved. Ion implantation methods and charge trapping in ion implanted diodes needs attention. And other types of instabilities have inhibited the introduction of even simple transistor types (e.g. JFETs). These facts, together with data not yet fully understood will be discussed. aps.org jbk

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