Patent ID: 11919126
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC B  H | IPC B  H

Claim 14:
15. A chemical mechanical planarization (CMP) method, comprising:
removing a platen assembly from a first platen housing wherein the platen assembly comprises an upper platen and lower platen;
providing a monolithic platen within the first platen housing to replace the platen assembly, wherein the monolithic platen fits within contours of the first platen housing, and wherein the monolithic platen is formed of a single piece of material with a continuously non-concave top surface having no holes therein, wherein the monolithic platen comprises:
a first portion within a first opening of the first platen housing, and
a second portion within a second opening of the first platen housing, wherein the first portion has a different diameter than the second portion, and wherein the first and second portions form the single piece of material such that no interface exists between the first and second portions;

providing a polishing fluid delivery conduit above the monolithic platen, wherein the polishing fluid delivery conduit is configured to deliver slurry to the monolithic platen during performance of CMP; and
providing a platen assembly within a second platen housing, wherein the platen assembly comprises:
an upper platen within a third opening of the second platen housing, and
a lower platen below the upper platen and within the a fourth opening of the second platen housing, wherein the upper platen and the lower platen have different diameters and are formed from two separate pieces.