Linear chemical mechanical planarization (CMP) system and method for planarizing a wafer in a single CMP module
View Patent ↗A linear chemical mechanical planarization (CMP) belt pad includes a first portion comprised of a first pad material, e.g., polyurethane, and a second portion comprised of a second pad material, e.g., porous rubber. The first portion has a first end and a second end. The second portion is situated between the first and second ends of the first portion and extends substantially across a width of the belt pad. Alternatively, the second portion may be embedded in the first portion such that a peripheral surface of the second portion is surrounded by a surface of the first portion. A linear CMP system and a method for planarizing a wafer in a single linear CMP module also are described.
1. A linear chemical mechanical planarization (CMP) system, comprising:
a pair of rollers;
a belt pad disposed on the rollers, the belt pad having a first portion comprised of a first pad material and a second portion comprised of a second pad material, and the belt pad having a reference notch;
a wafer carrier disposed above a surface of the belt pad; and
a control system for controlling a rotation of the rollers, the control system being configured to determine a location of the second portion of the belt pad relative to the wafer carrier by using the reference notch, and the control system being configured to stop rotation of the rollers such that the second portion of the belt pad is aligned under the wafer carrier.
2. The CMP system of claim 1 , wherein the first portion of the belt pad is configured for barrier removal.
3. The CMP system of claim 1 , wherein the first pad material is comprised of polyurethane.
4. The CMP system of claim 1 , wherein the second portion of the belt pad is configured for buffing.
5. The CMP system of claim 1 , wherein the second pad material is comprised of porous rubber.