26 March 2008 Performance comparison of negative resists for copper rerouting and other electroplating applications
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Abstract
Two types of chemically amplified (CA) negative resists were compared lithographically. An acid catalyzed resist and a photopolymerizable type resist. The optimum lithographic performance of the acid catalyzed resist on Cu is in the thickness range below 15μm, with vertical profiles. This resist exhibits inverted profiles on Cu above 15μm of thickness. The Photopolymer type resist performs best above 25μm thickness, and can be used for 120μm thick applications with single coat. Top line rounding is more observed with this resist as its applied thickness is reduced below 20μm. This effect is believed to be related to oxygen uptake in the resist surface. Thus it has a more pronounced effect at relatively thinner films. Both resists are compatible with the electroplating process.
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Medhat Toukhy, Medhat Toukhy, Chunwei Chen, Chunwei Chen, Margareta Paunescu, Margareta Paunescu, Georg Pawlowski, Georg Pawlowski, } "Performance comparison of negative resists for copper rerouting and other electroplating applications", Proc. SPIE 6923, Advances in Resist Materials and Processing Technology XXV, 69233I (26 March 2008); doi: 10.1117/12.773965; https://doi.org/10.1117/12.773965
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