Hello everybody,

for a project I need an Al-layer >2,5µm thickness. We are able to do PVD for
this. First question is if anybody has some advices for wet etching? I
thought about using ANPE, but we don't have any eyperiences with such thick
layers. Second question is, if there are any known oxydation barriers I
could use? Perhaps a thin Au-layer could work? But I am concerned about the
high etch-rate of Al in aqua regia, which I would use for etching Au.

Any advice is highly appreciated.

Best regards, Chris