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Technology Stocks : Kopin Corp. (KOPN) -- Ignore unavailable to you. Want to Upgrade?

To: kech who wrote (580)	3/15/1999 5:39:00 PM
From: kinkblot	Respond to of 1820

Can Kopin extend their expertise? kopin.com This shows both the InGaP and the AlGaAs HBT structures. You can see that the Collector and Base layers are the same, and only the Emitter layers are changed. They are both built up from a GaAs substrate. The InGaP is the next generation wafer that Hewlett-Packard is using to build circuits for their high-frequency test and measurement equipment. The [wafers] link goes to the main "HBTs & Wafers" page. In the last paragraph there they mention that both types can be fabricated using the same production systems: Our InGaP HBTs are grown using the same equipment set as our AlGaAs HBTs, therefore, our capacity expansion will support InGaP HBT production as well as AlGaAs HBT production. InP. Much of their technology would probably be transferable to device wafers based on InP substrates, if they wanted to get into that. Some other companies are becoming more interested in InP. Here's a general review article, not very recent: Indium phosphide: quantum improvement over GaAs?: techweb.com Raytheon TI Systems is mentioned as working on quantum-effect devices called resonant tunneling diodes. Keep in mind that Raytheon is in the defense business and sells mostly high-cost systems, with some commercial overlap in areas such as air traffic control. II-VI. In Kopin's LED patent(s) they state that one array-layer of a three color stack may be "a blue LED formed of II-VI material, such as ZnSe, ZnSSe or a group IV alloy such as SiC". Elsewhere they include II-VI as well as III-V compounds when discussing optoelectronic devices such as semiconductor lasers and tranceivers. But patents are normally worded so that coverage is not needlessly restricted and includes the broadest range of potential applications. I doubt if they have any plans to actively pursue this.