Patent ID: 7446051
Filing Date: 2008-11-04
Classification: H01L,Y02E,Y02P

Abstract:
1. A method of etching silicon through a mask comprising: (a) forming a layer of organic resin as a mask over a free surface of a device to be etched; (b) placing the device on a stage; (c) locating an ink-jet print device over the device to be etched and in close proximity thereto, the ink-jet device and stage being moveable relative to one another; (d) using an additive to adjust the viscosity of a reactive material to that required by the ink-jet device; (e) supplying the ink-jet device with the reactive material with the additive added; (f) moving the device and the ink-jet device relative to one another under control of control means; (g) controlling the ink-jet device to deposit predetermined amounts of the reactive material onto a surface of the mask in a predetermined pattern as the device and the ink-jet device move relative to one another, to form openings in the mask, thereby exposing the silicon surface in areas to be etched; and (h) applying a dilute solution of hydrofluoric acid (HF) and potassium permnanganate (KMnO