Abstract: A polishing head includes a substrate carrier to suck and to pressurize a substrate, and a retainer ring secured under the substrate carrier, the retainer ring surrounding a circumference of the substrate and including a cooling channel therethrough to circulate a coolant fluid.

Abstract: A polishing head includes a substrate carrier to suck and to pressurize a substrate, and a retainer ring secured under the substrate carrier, the retainer ring surrounding a circumference of the substrate and including a cooling channel therethrough to circulate a coolant fluid.

Abstract: An apparatus is provided for performing a wet process to a substrate. The apparatus comprises a bath, having a top portion which defines an opening, for storing a liquid for wet processing the substrate. A cover is also provided which is movably connected to the bath at the top portion thereof. The cover includes a first face facing the opening of the bath and a second face facing away from the opening of the bath. The second face has a plurality of holes therewithin. It also contains a portion interposed between the first and second faces in communication with the holes for containing a cleaning solution. The cleaning solution is discharged through the holes from the containing portion and flows on the second face for removing any impurities from the second face.