Patent ID: 7425275

Claim:
A method of fabricating a vertically tapered structure comprising: placing a spacer layer at a predetermined area on a wafer; placing a mask layer at a predetermined area on the spacer layer; over-etching the spacer layer, by etching a certain area below the mask layer, fabricating a cantilever type shadow mask comprising the spacer layer and the mask layer; rotating the wafer; and scanning ion beams into a surface of the wafer at a predetermined tilt angle against a rotational axis of the wafer in which the shadow mask is fabricated, and etching the wafer layer by the mask into an area in which the ion beam is blocked during a predetermined time period, an area in which the ion beam is blocked during an entire time period, and an area in which the ion beam is scanned during an entire time period, to fabricate vertically tapered structure.