Patent ID: 8607807

Claim:
A liquid treatment apparatus comprising: a substrate retaining unit comprising a retaining member configured to hold a peripheral edge of a substrate to retain the substrate horizontally; a rotational driving unit configured to rotate the substrate retaining unit; and a nozzle comprising a first ejection port provided to eject a chemical liquid toward a lower surface of the substrate retained by the substrate retaining unit, a plurality of second ejection ports provided to eject a mist containing isopropyl alcohol, IPA, and N 2 gas toward the lower surface of the substrate retained by the substrate retaining unit, a third ejection port provided to eject deionized water, DIW, toward the lower surface of the substrate retained by the substrate retaining unit, and a fourth ejection port provided to eject N 2 gas toward the lower surface of the substrate retained by the substrate retaining unit, wherein the plurality of second ejection ports are arrayed between a position opposing to a central portion of the substrate and a position opposing to a peripheral portion of the substrate retained by the substrate retaining unit, wherein the nozzle has a central portion located below a central portion of the substrate retained by the substrate retaining unit, and a bar-shaped portion extending from the central portion of the nozzle in a radial direction of the substrate retained by the substrate retaining unit, wherein the plurality of second ejection ports are disposed in the bar-shaped portion so as to be arrayed in a longitudinal direction of the bar-shaped portion of the nozzle, wherein an IPA passageway and an N 2 gas passageway extend in the longitudinal direction of the bar-shaped portion of the nozzle, wherein IPA ejecting passages are connected to the IPA passageway, and N 2 gas ejecting passages are connected to the N 2 gas passageway, and wherein at locations near each of the second ejection ports respective IPA ejecting passages and respective N 2 gas ejecting passages merge together to cause a collision of the IPA and the N 2 gas to form an IPA mist that is ejected from the second ejecting ports.