Patent ID: 9382113
Filing Date: 2016-07-05
CPC Classification: B81B,B81C,G02B

Claim Text:
1. A method for fabricating a self-aligned vertical comb drive structure, comprising the following steps of: a) forming a multi-layer structure that includes a first mask layer, a first device layer, a stop layer, a second device layer and a second mask layer arranged in the given order in a vertical direction, the stop layer being formed with a self-aligned pattern, the multi-layer structure further including a first comb structure and a second comb structure that are inter-digitated and that are formed via etching using the self-aligned pattern as a first mask, the first comb structure including a plurality of first comb fingers, each having a first finger portion formed in the first device layer and a second finger portion formed in the second device layer and separated from the first finger portion by the self-aligned pattern, the second comb structure including a plurality of second comb fingers and being formed solely in the second device layer; and b) removing the second finger portions of the first comb fingers via etching using the second mask layer as a second mask; wherein the first device layer is formed from a wafer and wherein the vertical direction is parallel to a thickness direction of the wafer.