Process of damage etching the backside of a semiconductor wafer with protected wafer frontside

摘要

Before the wafer is diced into individual chips, the thinly ground wafer is subjected to microwave or HF excited chemical downstream plasma etching using a fluoride (e.g. CF4, NF3 or SK6) in the etchant gas. In the microwave version of the process, the face of the wafer is protected by a film, so that it can be transported conventionally and etched from above. The operation is completed in the space of 10 seconds to 4 minutes according to the method of grinding and the etchant chemistry for removal of about 200 nm..