Patent ID: 8734593

Claim:
A substrate treatment apparatus arranged to treat a peripheral portion of a substrate with a treatment liquid, the apparatus comprising: a substrate holding unit which horizontally holds the substrate; a rotating unit which rotates the substrate held by the substrate holding unit about a vertical axis; a first nozzle having a first opposing face to be opposed to a region of a lower surface of the substrate inward of the peripheral portion in spaced relation to the lower surface of the substrate during rotation of the substrate by the rotating unit, and a treatment liquid spout provided in the first opposing face arranged to spout the treatment liquid to fill a space defined between the lower surface of the substrate and the first opposing face with the treatment liquid spouted from the treatment liquid spout to keep the space in a liquid filled state; a treatment liquid supplying unit which supplies the treatment liquid to the first nozzle; and a rotation control unit which controls the rotating unit; wherein the rotation control unit and the first nozzle cooperatively define an amount of the treatment liquid flowing around from the lower surface to the upper surface of the substrate, so as to control a treatment width of the peripheral portion of an upper surface of the substrate; wherein the first opposing face includes an inner opposing surface provided with the treatment liquid spout, and an outer opposing surface provided annularly around the inner opposing surface to be brought into more closely opposed relation to the lower surface of the substrate held by the substrate holding unit than the inner opposing surface, the outer opposing surface having an inner periphery that defines an opening having substantially the same shape and size as the inner opposing surface such that an entire area of the inner opposing surface is opposed to the lower surface of the substrate through the opening, and wherein a recess having an inner diameter smaller than a diameter of the substrate is defined by the inner opposing surface and the outer opposing surface, and the recess is arranged to be filled with the treatment liquid spouted from the treatment liquid spout.