Zhizhong, Hionix may be able to help. How many wafers do you need and what is your price target. DO you have any specs on the poly silicon layer?. Thanks Ravi Mullapudi Hionix, Inc. 2157 O'Toole Ave., Suite: E San Jose, CA 95131 -----Original Message----- From: Zhizhong Yin [mailto:zzyin@jhu.edu] Sent: Thursday, May 01, 2003 6:13 AM To: mems-talk@memsnet.org Subject: [mems-talk] Quartz or silicon wafer with a poly-silicon layer Hi, members, Anyone knows where could I purchase quartz or silicon wafer with a poly-silicon layer (about 0.5 um)? for silicon wafer, a isolation SiO2 layer ( > 2 um) between Si and Poly is needed. Thanks Zhizhong Yin Phone#: 410-516-8525(o) Johns Hopkins University 410-662-4760(h) 200 Latrobe Hall email:zzyin@titan.me.jhu.edu 3400 N. Charles Street homepage:www.me.jhu.edu/~zzyin Baltimore MD 21218 ***********************************************************