Patent ID: 9685606
Date: 2017-06-20
CPC Classifications: H01L

Claim:
1. A method of forming patterns, comprising: forming an etch-target layer on a substrate; forming mask patterns on the etch-target layer; and etching the etch-target layer using the mask patterns as an etch mask to form patterns that are spaced apart from each other, wherein etching the etch-target layer comprises irradiating the etch-target layer with an ion beam, the ion beam having an incident energy in a range from 600 eV to 10 keV; wherein etching the etch-target layer comprises forming a recess region in the etch-target layer between the mask patterns; and wherein the ion beam is incident onto a bottom surface of the recess region at a first angle with respect to a top surface of the substrate and is incident onto an inner side surface of the recess region at a second angle with respect to the inner side surface of the recess region, wherein the first angle ranges from 50° to 90° and the second angle ranges from 0° to 40°.