Abstract:A method to improve pattern critical dimension (CD) and reduce the metal residue level during gold (Au) and chrome (Cr) wet etch processes in MEMS devices is investigated. Instead of traditional single-step wet etch process, a multi-step wet etch method is used to etch Au with the etchant formulated by potassium iodide, iodine and deionized water (KI/I 2 /H 2 O). Compared with the single step wet etching process, the Au CD uniformity has been significantly improved from 10 um to 3.5 um in the experiment. Furth… Show more
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