Hello all, I am new in this forum and I found really interesting. I want to etch the bottom of SOI wafer 550um in LF. I have the same problem with grass or black silicon. I used some Si bulk wafer to do it first and it is really hard to do it without hard mask. Has anyone any idea about it ? I am using SPR photoresist _______________________________________________ Hosted by the MEMS and Nanotechnology Exchange, the country's leading provider of MEMS and Nanotechnology design and fabrication services. Visit us at http://www.mems-exchange.org Want to advertise to this community? See http://www.memsnet.org To unsubscribe: http://mail.mems-exchange.org/mailman/listinfo/mems-talk