Patent ID: 11961740
Assignee: SHANGHAI HUALI INTEGRATED CIRCUIT CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. The method for manufacturing semiconductor devices according to claim 9, wherein the step 4 further comprises sub-steps of:
forming a fifth silicon oxide layer by means of a diffusion thermal oxidation process, wherein a top surface of the fifth silicon oxide layer is disposed in the first opening between the top surface of the semiconductor substrate and a top surface of the first mask layer;
forming a sixth silicon oxide layer by means of a full deposition process, wherein the sixth silicon oxide layer is grown on the top surface of the fifth silicon oxide layer and the top surface of the first mask layer, wherein the sixth silicon oxide layer fully fills a remaining region of the first opening on the top surface of the fifth silicon oxide layer, and wherein the top surface of the sixth silicon oxide layer is higher than the top surface of the first mask layer; and
removing a portion of the sixth silicon oxide layer from the top surface of the first mask layer by means of a chemical mechanical polishing process, wherein the top surface of the sixth silicon oxide layer in the first opening is flush with the top surface of the first mask layer, and wherein the second material layer is formed by stacking the fifth silicon oxide layer and a remaining portion of the sixth silicon oxide layer.