Method and apparatus for performing hydrogen optical emission endpoint detection for photoresist strip and residue removal
First Claim
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1. A method, comprising:
- positioning a substrate comprising a photoresist layer into a processing chamber;
processing the photoresist layer using a multiple step plasma process; and
monitoring the plasma for a hydrogen optical emission and an oxygen optical emission during the multiple step plasma process;
wherein the multiple step plasma process comprises;
removing a bulk of the photoresist layer using a bulk removal step; and
switching to an overetch step in response to the monitored hydrogen optical emission or the monitored oxygen optical emission.
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Abstract
Methods for monitoring and detecting optical emissions while performing photoresist stripping and removal of residues from a substrate or a film stack on a substrate are provided herein. In one embodiment, a method is provided that includes positioning a substrate comprising a photoresist layer into a processing chamber; processing the photoresist layer using a multiple step plasma process; and monitoring the plasma for a hydrogen optical emission during the multiple step plasma process; wherein the multiple step plasma process includes removing a bulk of the photoresist layer using a bulk removal step; and switching to an overetch step in response to the monitored hydrogen optical emission.
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21 Claims
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1. A method, comprising:
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positioning a substrate comprising a photoresist layer into a processing chamber; processing the photoresist layer using a multiple step plasma process; and monitoring the plasma for a hydrogen optical emission and an oxygen optical emission during the multiple step plasma process; wherein the multiple step plasma process comprises; removing a bulk of the photoresist layer using a bulk removal step; and switching to an overetch step in response to the monitored hydrogen optical emission or the monitored oxygen optical emission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of etching a photoresist layer comprising:
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positioning a substrate comprising a photoresist layer into a processing chamber; processing the photoresist layer using a multiple step plasma process; and monitoring the plasma for both by-product optical emission and a reactant optical emission during the multiple step plasma process; wherein the multiple step plasma process comprises; removing a bulk of the photoresist layer using a bulk removal step; and switching to an overetch step in response to the monitored by-product optical emission. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification