Liftoff trouble

[Vignesh G Shankar]

Hi,

I have a 25 nm thick patterned block copolymer template, which I am trying 
to use for liftoff. Unfortunately, even with 2 nm of Cr down I am unable to 
lift the unwanted polymer off. The polymer is cross-linked polystyrene.

Do you have any suggestions? I was thinking of ion milling at a glancing 
angle to remove the top 2 - 3 nm layer of Cr enabling access for the 
solvent (toluene) to the block. Do any of you know if such an ion milling 
is possible at the SNF?

Thanks.

- Vignesh