Abstract:
An oxidation resistant masking layer for a semiconductor body having a first layer of oxygenated silicon nitride material having a refractive index in the range of 1.60 to 1.85, and a second overlying layer of Si3N4 bonded to the first layer having a thickness of at least 100 Angstroms. A process for forming recessed thermal SiO2 isolation regions in a silicon semiconductor body wherein a masking layer is deposited on the silicon body by depositing a blanket layer of oxygenated silicon nitride and an overlying blanket layer of Si3N4, forming openings in the resultant composite masking layer and etching grooves into the silicon semiconductor layer to the desired thickness thus defining the desired recessed isolation regions, and exposing the resultant structure to an oxidizing environment for a time sufficient to form the desired silicon oxide recessed regions.
Abstract translation:一种用于半导体本体的抗氧化屏蔽层,其具有折射率在1.60至1.85范围内的第一氧化氮化硅层,以及与第一层结合的厚度至少为100埃的Si 3 N 4的第二覆盖层 。
Abstract:
A method for forming a semiconductor device having a substantially cup-shaped region of one conductivity type between two regions of opposite conductivity type to preferably form a field effect transistor device. The region may be formed through one opening in an insulating layer located upon the surface of the device. Two successive diffusion operations of opposite conductivity types made through this same opening in the insulating layer forms the cup-shaped region to the desired thickness.