Hi, I want to use bosch to fabricate my structures for vertical sidewalls. I have an ordinary RIE system. And I plan to use SF6+He to etch silicon and CF4+H2 to form the sidewall passivation polymer. And I am going to use photoresist as the mask during etching. The thickness I needed is about 8 microns. Because I don't have any experiences of bosch etching, any suggestion will be very helpful. And I really need some point to start with. Thanks a lot! Peng Yao DOEs lab Electrical Engineering Dept. Univeristy of delaware Newark D.E 19716