Patent ID: 6852560

Claim:
A method for fabricating a nozzle on a substrate comprising: a) applying a primary hard mask in a nozzle pattern on a surface of the substrate; b) applying a spin photoresist for patterning of the primary mask, including the through channel, annulus, and alignment marks for the through channel secondary mask pattern; c) etching the primary mask with dry plasma or wet chemical etch; d) stripping the photoresist; e) spinning photoresist on backside of substrate; f) patterning the backside feature; g) etching the backside mask; h) etching the feature into the substrate; i) spinning photoresist on substrate front side; j) patterning front side photoresist with the through channel feature; k) etching through channel into substrate; l) stripping the front side photoresist; m) etching the annulus into the substrate; and n) growing thermal dry oxide and strip the grown oxide with acid in order to clean the wafers.