SI
SI
discoversearch

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor.  We ask that you disable ad blocking while on Silicon Investor in the best interests of our community.  If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.
Technology Stocks : MEMC INT'L. (WFR -NYSE) The Sleeping Giant?
 Public ReplyPrvt ReplyMark as Last ReadFilePrevious 10Next 10PreviousNext  
To: Maurice S. Green who wrote (3111)3/8/1998 8:29:00 PM
From: Zeev Hed  Read Replies (3) of 4697
 
Maurice, someone earlier in the week expressed concerns to WFR's business from a new quarter, isotopically pure (Si-28) wafers. So I decided to search the subject and find out what is this all about. Well, it is not a wafer made of Si-28 (this will be outrageously expensive), but an epitaxial layer of Si-28 (pure isotopically) on normal Si wafers. The company, Isonics, does not say much. They say that the thermal conductivity is 50% better than in normal silicon. I will grant you that isotopically conductive silicon will have better thermal conductivity than natural silicon (providing both have the same degree of crystal perfection). I doubt, however, that a monoatomic layer will solve any heat dissipation problems, since it is a "high" thermal conductor in series with the normal conductor (the heat generated needs to be conducted to the back of the wafer where it can be "taken out and dissipated). Lateral thermal conductivity will probably be improved a little but this is not where the problem is.

You can all sleep another night quitely, knowing that normal standard silicon is still king and neither GaAs nor Si-28 are going to dethrone these soon.

I presume that the SiGe is also an epitaxial layer, but have not looked into that one yet.

Zeev
Report TOU ViolationShare This Post
 Public ReplyPrvt ReplyMark as Last ReadFilePrevious 10Next 10PreviousNext  

HomeMailHotSubjectMarksPeopleMarksKeepersSettings
Terms Of UseContact UsCopyright/IP PolicyPrivacy PolicyAbout UsFAQAdvertise on SI
© 2025 Knight Sac Media.  Data provided by Twelve Data, Alpha Vantage, and CityFALCON News