Patent ID: 7674324

Claim:
An exposure system for exposing a photoresist layer on a top surface of a wafer to light, comprising: an environment chamber containing a light source, one or more focusing lenses, a mask holder, a slit and a wafer stage, said light source, said one or more focusing lenses, said mask holder and said slit aligned to an optical axis said wafer stage moveable in two different orthogonal directions, each said orthogonal direction orthogonal to said optical axis, said mask holder and said slit moveable in one of said two orthogonal directions; a filter in a sidewall of said environment chamber, said filter comprising: a filter housing; and chemically active carbon nanotubes within said filter housing, said chemically active carbon nanotubes comprising a chemically active layer formed or carbon nanotubes of comprising chemically reactive groups on sidewalls of said carbon nanotubes; wherein said carbon nanotubes have a first end attached to a substrate and (i) said carbon nanotubes are arranged singly, adjacent nanotubes on said substrate not touching or (ii) said carbon nanotubes on said substrate arranged in bundles, carbon nanotubes of each bundle not touching carbon nanotubes of adjacent bundles; and means for forcing air or inert gas first through said filter then into said environment chamber and then out then out of said environment chamber.