Hi, Has anyone done an HF vapor release on die from the SUMMiT V process? I'm wondering if the silicon nitride layer swells up like some of the pictures I have seen in the literature (Thor Bakke et al., Etch Stop Materials for release by vapor HF etching, no journal or conference listed...). Also, does anyone have any experience building a "home-made" HF vapor release system? Care to share your thoughts and experiences? Worth doing? or not? controllability and repeatability? Thanks in advance. Felix ---------------------------- Felix Lu, Ph.D. Applied Quantum Technologies, Inc. Durham, NC 27707