The project I am working on involves through wafer etching with a DRIE machine. I am interested to see how this is done in other facilities. My current process involves attaching a patterned piece of silicon to another 4" wafer (the only size our STS will accept). I tried spinning a thick coat of photoresist on the carrier wafer and exposing an area in the middle for my sample (so that I would have better thermal contact to the sample. I use cool grease to attach the sample to the carrier wafer.) and that seemed to work ok, but there must be a better way. Any ideas? Jonathan Abbott jdabbott@byu.net