Clearly you guys know a little about chip production and nothing about microgravity. There is no such thing as "Zero G" - it's a myth. Orbital satelites live in "microgravity" and not true zero gravity. It's complex - but trust me - it's true.
Dust is as prevalent in space as it is in your own home - but the ramifications of it are much more evident. It is a major problem on the ISS cleaning fungus and mould from things. (Fungus can eat glass, and even metals!) In fact recently when they removed a panel for inspection, they found a glob of disgusting brown water the size of a basketball floating in amongst the electronics!
So, the answer to the question is NO: there is no benefit to using lithography in orbit: the costs would be much higher, but more importantly, theres no process in the production of a semiconductor that will benefit from a microgravity production environment. In fact, if I remember my lithography 101, it might actually be harder, or impossible to use the current method in space.
Microgravity is ideal for growing chemically pure and perfectly formed crystals which can't be made on earth in exacting enough tolerances. What use this might be in the future is arguable. There's no doubt that there will arise product ranges which will benefit from being made in microgravity, but it is pretty pointless to speculate on what those might be.