Patent ID: 9570289
Date: 2017-02-14
CPC Classifications: C23C,H01J,H01L

Claim:
1. A showerhead assembly of a semiconductor substrate plasma processing apparatus, the showerhead assembly comprising: a face plate including a lower wall and an annular outer wall extending upwardly from an outer periphery of the lower wall; and a back plate wherein the upwardly extending annular wall of the face plate is welded to an outer periphery of a back plate such that a cavity is formed between the lower wall of the face plate and the back plate; wherein the lower wall of the face plate includes at least 6,000 gas injection holes that extend therethrough wherein the at least 6,000 gas injection holes are spatially arranged in the lower wall of the face plate such that process gas delivered through the at least 6,000 gas injection holes minimizes a seam effect of TEOS oxide film deposited in at least one trench of a semiconductor substrate during a TEOS oxide trench filling operation.