Patent ID: 6716657
Filing Date: 2004-04-06
Classification: B81B,G02B

Abstract:
Method for the manufacture of a plurality of micromechanical devices comprising a micromechanical device array (MDA) in which the MDA is supported by a semiconductor substrate, the substrate having a top side and a bottom side, comprising the steps of:(a) forming a plurality of conductive vias through the silicon substrate, the plurality of conductive vias formed by the steps of: i. masking the silicon substrate leaving openings for the conductive vias, ii. etching the silicon substrate in the openings by RIE to form holes extending completely through the silicon substrate, the holes having essentially vertical sidewalls, iii. oxidizing the silicon substrate to form an oxide layer on the sidewalls, iv. depositing polysilicon on the silicon substrate by chemical vapor deposition to completely fill the holes and deposit polysilicon on at least the top surface of the silicon substrate, and v. planarizing the top surface of the silicon substrate, leaving the plurality of conductive vias through the silicon substrate, (c) forming a bottom side printed circuit on the bottom side of the silicon substrate, the bottom side printed circuit comprising interlevel bond pads and runners interconnecting the interlevel bond pads with the plurality of conductive vias, (d) forming an MDA on the top side of the semiconductor substrate, and (e) forming conductive runners on the top side of the substrate interconnecting each of the micromechanical devices in the MDA with at least one of the plurality of conductive vias, and (f) providing means for input signals to the interlevel bond pads.