Patent ID: 8551288

Claim:
An apparatus for removing a photoresist structure from a substrate, comprising: a chamber for receiving the substrate on which the photoresist structure is formed; a first gas source for supplying water vapor into the chamber; a second gas source for supplying ozone gas into the chamber; a showerhead for uniformly distributing a mixture of the water vapor and ozone gas onto the substrate, the showerhead including an enclosed first space connected to the first gas source and a second space connected to the second gas source and to the first space so that the water vapor is supplied to and partially condensed into liquid water on one or more surfaces of the first space, with ozone gas and water vapor without liquid water being supplied to the second space from the second gas source and the first space to form the mixture therein; and a first heater heating the showerhead to vaporize the liquid water on the one or more surfaces of the first space, wherein the showerhead includes a first plate defining an upper bounds of the first space, a second plate having a plurality of first holes for enabling communication between the first space and second space, and a third plate having a plurality of second holes for enabling communication between the second space with an outside of the showerhead so that the mixture is supplied onto the substrate through the second holes, and upper and side regions of the first space and second space being bounded by the first heater, and wherein the first, second, and third plates including the first and second spaces are enclosed by the first heater and the first heater is disposed above the first plate within the chamber.