Al2O3 patterning

Hi,

I want to etch Al2O3 but I can not pattern it because photoresist stick to and don't remove enough in exposed areas. Can anyone help me in choosing another masking material or changing process parameters to solve this?

thanks, Nima

Reply to
Nima
Loading thread data ...

Try descum in Oxygen plasma for a minute or two - enough to remove exposed scum but not enough to strip too much resist in unpatterned areas.

Regards, Fred

Reply to
Fred Chen

Thanks dear friends for your advices, I successed in patterning it but in trying to etch with 1:1:3 NH4OH:H2O2:H2O in 80°C and boiling sulfuric acid but neither do good. the former remove the mask and the latter with Cr mask hasn't significant effect. I search and find that may H3PO:Cr2O3 can do it. are any one know about alumina etchants? and dear uncle Al. I don't understand what is the effect of silan on the alumina surface. can you express this?

Thanks a lot Nima

Reply to
Nima

Here are a couple of related links on alumina etchants from archives sci.nanotech:

formatting link
formatting link
Regards, Fred

Reply to
Fred Chen

after all, I try NaOH and acid nitric even boiling and use acid nitric vapor too but I don't see any change. this may be because I want to etch through substarte and not only in grain bonderies and these materials have a little effect then. there should be an etchant for alumina that can solve it relativly rapid but what is that? and about silane, I cannot test it because of it's dabger of explosion! may be something little dangerous be found. I try ...

thanks for comments and looking for more advices Nima

Reply to
Nima

Dilute chromic acid and phosphoric acids will selectively pattern alumina. As was stated in earlier posts we know that 1M NaOH will etch alumina. Reference: "Fabrication of Alumina Nanotubes and Nanowires by Etching Porous Alumina Membranes" Z.L.Xiao et al. Naanoletters 2002 Vol.2, No.11 1293-1297

boer

Reply to
boer

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.