XEF2 ETCHER System Overview Xenon Difluoride etcher is a kind of vapor etcher where reactive gas spontaneously reacts with a material in vapor phase. This XeF2 can etch Si and Ge isotropically and offers excellent selectivity to various materials such as Al, SiO2, Si3N4 and photoresist. Location: E6-05-09, Level 5 Cleanroom Contact: e6nanofab@nus.edu.sg