Another challenge was stripping of AZ P4620 photoresist
when patterning paraffin by lift-off. In our work, acetone, which
is commonly used for resist stripping in conventional processing,
could not be used since it dissolves paraffin. Thus, pure and
undiluted AZ400K developer was used instead to strip AZP4620
photoresist. To enhance photoresist removal, photoresist pattern
was flood exposed prior to depositing paraffin.