Patent ID: 9190287
Filing Date: 2015-11-17
Classification: H01J,H01L

Abstract:
1. A method of fabricating a fin FET, the method comprising the steps of: preparing a substrate which comprises a semiconductor fin thereon; and ion beam etching a side wall of the semiconductor fin using an ion beam extracted from a grid, wherein, in the ion etching step: the substrate is positioned with a tilt with respect to the grid; the ion beam etching is performed with an amount of energy of the ion beam set such that an amount of energy of the ion beam incident in an extending direction of the fin is larger than an amount of energy of the ion beam incident in any other direction; the substrate is rotated about an axis perpendicular to a plane of the substrate; the substrate rotation involves repeating rotation and rotation stop; and rotation stop time of the substrate is longer when the grid is positioned in the extending direction of the fin, than when the grid is positioned in any other direction.