Patent ID: 7387132

Claim:
An apparatus for treating a wafer comprising: a rotating chuck that supports and rotates a wafer; a treating chamber, wherein the rotating chuck is arranged in the treating chamber; a treating fluid supplying part disposed over the rotating chuck, the treating fluid supplying part comprising: a first disc-shaped plate having a recess defined therein for receiving a treating fluid; and a second disc-shaped plate attached to the first disc-shaped plate and having a slit defined therein, the recess and the second disc-shaped plate defining a receiving portion wherein the slit is arranged in communication with the receiving portion, wherein a length of the slit is equal to or greater than a radius of the wafer; and an ultrasonic oscillating part disposed in the receiving portion and above the slit configured to apply ultrasonic oscillation to the treating fluid, wherein the treating fluid is applied to a treatment surface of the wafer through the slit, wherein an upper portion of the treating chamber is open and wherein the treating fluid supplying part covers the upper portion of the treating chamber.