A Formation of Si Native Oxide Membrane Using High-Selectivity Etching and Applications for Nano-Pipe Array and Micro-Diaphragm on Si Substrate

A novel technique in creating a cavity by using a membrane of Si-native oxide has been developed. The membrane of Si-native oxide was formed by high-selectivity Cl₂ etching of Si which surface was treated by wet chemicals. Following film deposition onto the membrane which was supported by SiO₂ mask can make a cavity in the substrate. The advantage of this technique is its ability to maintain the CD of cavity even after film deposition to seal the via-opening