If you have a supplier on the Single Side and can arrange the purchase of the substrates in etched form, I can supply the Double Side Processing to some very tight specs. As the High Res Float Zone is limited to only two manufacturers world wide ( Wacker and SEH), it is more difficult to obtain than is CZ Silicon. With Etched wafers from either of these two suppliers, I can supply you Double Side wafers in the 150mm to the final specs you need with TTV at < 2 um ( typical <1- 1.5um). I am working to gain some ingot from one of these suppliers to stock wafers but they are reluctant to sell ingot and also to other than end users. Let me know if you may have an interest in this. Also, If you are not getting your Single Side Float Zone wafers from the Direct manufacturer, I can supply some excellent product using your lapped or etched substrates. Now, for CZ , I have no problem supply almost any material in SSP or DSP. Best Regards, -- Ken Smith Kmbh Associates 4968 Charter Road Rocklin, CA 95765 USA 510-714-5055 Efax- 510 217 4421 or 561 658 6136 High Purity Float Zone and Specialty CZ Silicon for Power, IR and Mirror Optics, Optoelectronics, MEMS, SOI, and other Semiconductor applications. Service in SOI, Polishing SSP and DSP. "Quenzer, Hans-Joachim" wrote: > > Dear MEMS colleagues, > > for a project I will need approx. 200 double side polished 6" silicon > wafers with high resistivity (3000 ohm cm, HRS Wafer, SEMI > specifications for 6" wafers). > For single side polished 6" wafer I have already a supplier, but up to > now I had no luck in finding a supplier for double side polished > material. Does anyone know a supplier for these wafers? > > Any suggestion is appreciated. > > Thanks > > Hans > > _------------------------------------------------ > H.J. Quenzer > Fraunhofer Institut f|r Siliziumtechnologie > Fraunhoferstr. 1 > D-25524 Itzehoe > Tel: +49 4821 17 4524 > Fax: +49 4821 17 4590 > e-mail: quenzer@isit.fhg.de > Internet: http://www.isit.fhg.de > ------------------------------------------------