Patent ID: 11908681
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B  G | IPC B  H

Claim 8:
9. A semiconductor fabricating system, comprising:
a chamber;
a wafer holder in the chamber and having a bottom surface for holding a wafer;
a brush assembly in the chamber and movable below the bottom surface of the wafer holder, wherein the brush assembly comprises:
a base plate;
an inner brush member disposed on the base plate and comprising:
a first base portion; and
protruding portions protruding from the first base portion of the inner brush member; and

an outer brush member disposed on the base plate and comprising:
a second base portion directly between the base plate and the first base portion of the inner brush member, wherein the first base portion and the second base portion have different materials; and
a peripheral portion over the second base portion of the outer brush member and surrounding the protruding portions of the inner brush member, wherein the protruding portions of the inner brush member define inner grooves therebetween, and the peripheral portion of the outer brush member has outer grooves therein, and widths of the outer grooves are greater than widths of the inner grooves;

a shaft, connected to the base plate of the brush assembly;
an actuator, connected to the shaft; and
a controller programmed to send electric signal to the actuator to drive the base plate to move below the bottom surface of the wafer holder.