Patent ID: 8927390
Filing Date: 2015-01-06
Classification: H01L

Abstract:
1. A method of etching a dielectric material located between sections of a selective material over a semiconductor substrate, the method comprising: depositing a selective material over a semiconductor substrate; etching at least one trench in the selective material and semiconductor substrate that creates at least two sections of the selective material that are isolated from one another over the semiconductor substrate; forming a first dielectric layer as a liner layer within the trench; depositing a second dielectric material in the trench, wherein the dielectric material at least partially fills between the isolated sections of the selective material; and exposing the substrate to a dry etchant gas that removes a portion of the first dielectric layer and the second dielectric material between the isolated sections of the selective material to form a recess below a top height of the isolated sections of the selective material, wherein the dry etchant gas comprises a fluorine-containing compound and molecular hydrogen, and wherein the first dielectric layer and second dielectric material are formed and etched at a temperature of about 400° C. or less.