hi all,

  I have been doing lithography for quite a long time but am still
confused about 'edge bead removal'. My spin-coater has to be closed
when it is spin-coating and there is edge bead on the wafers after
coating. Should I just use something like cotton bud to wipe off the
edge bead on periphery of the wafers? Or is there some clever method
of avoiding edge bead? Thanks