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12 June 2003 Challenges of processing thick and ultrathick photoresist films
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High viscous photoresists are required for the MEMS and MOEMS technology. Processing of thick and ultra-thick resist films is a challenging task. In this paper, procedures are presented to attain improved patterning results. Baking by infra-red radiation (IR baking) is described as an effective approach for effectively drying thick and ultra-thick resist layers. Patterning results are shown to confirm the performance and benefits of IR baking. Examples of up to 60μm thick layers of two positive tone resists, ma-P 100 and ma-P 1275 (micro resist technology GmbH, Germany), and up to 500 μm layers of chemically amplified negative tone photoresist SU-8 (MicroChem Newton, MA) are presented. IR baking allows reduced process time and lower bake temperature enabling high aspect ratio and low stress SU-8 layers.
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Mike Kubenz, Ute Ostrzinski, Freimut Reuther, and Gabi Gruetzner "Challenges of processing thick and ultrathick photoresist films", Proc. SPIE 5039, Advances in Resist Technology and Processing XX, (12 June 2003);

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