Resist adhesion in integrated circuit processing

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430313, 430506, 1566611, G03C 500

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043328814

ABSTRACT:
The problem of reliably adhering resists to underlying surfaces made of, for example, phosphorus-doped silicon dioxide or silicon nitride is a particularly difficult one. In practice, the use of standard adhesion promoters such as HMDS provides only marginal relief. By baking a relatively thin layer of resist on the underlying layer, a tenacious bond between the thin layer and the underlying surface is achieved. Subsequently, a relatively thick layer of resist is applied and patterned in a standard way. An excellent bond between the thick and thin resist layers results. Subsequent processing of the patterned thick layer leaves the two noted bonded interfaces virtually intact.

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