期刊
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
卷 17, 期 5, 页码 1093-1098出版社
IOP PUBLISHING LTD
DOI: 10.1088/0960-1317/17/5/032
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The effect of processing conditions on the curvature of SU-8 cantilevers up to 6400 mu m long is determined by experimental methods. Our observations suggest that a zero curvature condition can be achieved by controlling the exposure dose and post-exposure baking time for any given SU-8 thickness. The curvature of SU-8 cantilevers processed with different exposure doses and post-exposure baking times has been measured and reveals that the gradient of crosslinking density throughout the SU-8 film is the cause of out-of-plane stress. A general model for the SU-8 cantilever curvature is developed which explains the behavior of SU-8 structures that have been processed with different conditions and can be used to predict the general effect on the SU-8 cantilever curvature for different SU-8 thicknesses and process parameters.
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