Patent ID: 9711409
Date: 2017-07-18
CPC Classifications: H01L

Claim:
1. A method for manufacturing a fin arrangement, the method comprising: patterning a substrate to form a plurality of initial fins on a selected area of the substrate, wherein each of the plurality of initial fins has a width of about 5-30 nm; forming, on the substrate, a dielectric layer in such a manner that a portion of the dielectric layer in gaps between the plurality of initial fins on the substrate has a first thickness greater than a height of the plurality of initial fins, to substantially fill up the gaps and directly cover the plurality of initial fins, wherein a portion of the dielectric layer located on top of the plurality of initial fins has a second thickness substantially less than the first thickness; performing a planarization process on the dielectric layer to expose a top surface of each of the plurality of initial fins; and selectively etching the dielectric layer to expose a portion of each of the plurality of initial fins, wherein the exposed portion of each of the plurality of initial fins is used as a fin, and wherein portions of the substrate between adjacent initial fins of the plurality of initial fins have a surface level that is varied across the substrate, the plurality of initial fins have their respective top surfaces substantially flush with each other, and the dielectric layer has a substantially flat top surface after the selective etching.