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Micro-masking removal of TSV and cavity during ICP etching using parameter control in 3D and MEMS integrations

In this paper, a detailed examination on TSV and cavity inductive coupled plasma (ICP) etching is presented. We investigated the relation such as etching loop number, TSV etching depth and etching rate. Due to particles knocked off from the hard mask and then fallen down to the TSV and cavity bottom, micro-masking issue becomes serious after ICP etching. In addition, parameters of isotropic etching, pressure, and RF bias were studied to investigate the process of micro-masking removal.