Patent ID: 6539952
Filing Date: 2003-04-01
Classification: B08B,Y10S

Abstract:
A megasonic wafer treatment device comprising:a wafer support for supporting and rotating a wafer to be treated; a fluid supply port for directing a layer of fluid to the surface of the supported wafer; an electromechanical transducer assembly for converting electrical signals into mechanical vibrations of a pre-selected megasonic frequency and wavelength and applying the vibrations to the surface of the supported wafer through the layer of fluid, wherein the transducer assembly further comprises (i) a sealed lens having an interior which is bounded by a faceplate and a wall extending upward from the periphery of the faceplate, and a plurality of exterior surfaces, wherein at least one exterior surface of the faceplate portion of the lens comprises a planar fluid contact surface, and (ii) an electromechanical transducer which is located in the interior of the lens and placed in vibration transmitting contact with the faceplate, such that the vibrations are transmitted to the fluid contact surface, wherein the faceplate comprises a material, which is inert with respect to the fluid and which has a thickness that is a multiple of the wavelength of the mechanical vibrations; and wherein the fluid supply port is located through a portion of the faceplate.