Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Forming nonplanar surface
Patent
1989-06-14
1991-10-22
Bowers, Jr., Charles L.
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Forming nonplanar surface
430192, 430270, 430330, G03F 730, G03F 732
Patent
active
050595130
ABSTRACT:
Actinic (deep ultraviolet, ultraviolet and visible) light sensitive positive photoresist compositions containing a mixture of an alkali-insoluble photoactive compound capable of being transformed into an alkali-soluble species upon exposure to actinic radiation, in an amount sufficient to render the mixture relatively alkali insoluble and a polymer comprising an amount of CO--NH--CO groups, such as maleimide and especially maleimide--substituted styrene copolymers, sufficient to render the mixture readily alkali soluble upon exposure to actinic radiation are disclosed. The preferred copolymers include maleimide/styrene or .alpha.-methylstyrene in a 1:1 molar ratio. The preferred methylstyrene in a 1:1 molar ratio. The preferred photoactive compound suitable for a positive photoresist composition responsive to deep UV actinic radiation has the formula 18-B in Table I. The present invention also comtemplates photosensitive elements and thermally stable phtochemically imaged systems based on the actinic light sensitive positive photoresist compositions. The positive photoresist compositions are coated onto a substrate to produce a photosensitive element, which upon exposure to a pattern of actinic radiation of wavelength in the range of about 200-700 nm produces a photochemically imaged system that can be treated with an alkaline developer to form highly resolved patterns, by highly selective removal of exposed areas. After development, preferred embodiments of the photo-chemically images systems exhibit insignificant changes in the highly resolved features (one micron) in the patterned image upon postbaking at temperatures of about 230.degree. C. and is, thereafter readily stripped. The high thermal stability exhibited by the photochemically imaged systems formed from the positive photoresist compositions of the present invention allows faster processing at higher temperatures, on equipment like plasma etchers and ion implanters; the developed photochemically imaged systems of the present invention retain high resolution, i.e., retain sharp, steep patterned image profiles.
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McFarland Michael J.
Osuch Christopher E.
Bowers Jr. Charles L.
Hoechst Celanese Corporation
Roberts Richard S.
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