Patent ID: 9543210
Date: 2017-01-10
CPC Classifications: H01L

Claim:
1. A method comprising: receiving a semiconductor substrate; etching the semiconductor substrate to simultaneously form a plurality of intra-device openings and a first and a second inter-device opening in the semiconductor substrate, wherein a first depth of the plurality of intra-device openings is less than a second depth of the first and the second inter-device openings; filling the plurality of intra-device openings to form a plurality of intra-device insulation regions, and filling the first and the second inter-device openings to form a first and a second inter-device insulation region, respectively, wherein the step of filling the plurality of intra-device openings and the step of filling the first and the second inter-device openings are performed simultaneously, and wherein the plurality of intra-device insulation regions are between the first and the second inter-device insulation regions; etching back the plurality of intra-device insulation regions and the first and the second inter-device insulation regions, wherein remaining portions of the semiconductor substrate above top surfaces of the plurality of intra-device insulation regions form a plurality of semiconductor fins; forming a gate dielectric on top surfaces and sidewalls of the plurality of semiconductor fins; and forming a gate electrode on the gate dielectric.