Patent ID: 9570340
Date: 2017-02-14
CPC Classifications: B82Y,H01L

Claim:
1. A method of etching a crystalline semiconductor material, the method comprising: non-conformal depositing of an absorption layer on the semiconductor material; implanting a plurality of ions in at least one volume of the semiconductor material in such a manner as to make the semiconductor material amorphous in the at least one implanted volume, and as to keep the semiconductor material in a crystalline state outside the at least one implanted volume; and selectively etching, with hydrogen chloride, the amorphous semiconductor material relative to the crystalline semiconductor material, so as to remove the amorphous semiconductor material in the at least one volume implanted with the plurality of ions while maintaining the structure of the crystalline semiconductor material outside the at least one ion implanted volume wherein the implanting is performed over a depth of the semiconductor material between L the crystalline semiconductor material forms a layer extending in a plane, and the ion implanting is performed in at least two opposite directions +α and −α of inclination relative to the perpendicular to said plane.