Patent ID: 9649660
Date: 2017-05-16
CPC Classifications: B05C,B05D,B08B,H01L

Claim:
1. A substrate treatment method comprising: a water rinsing step of supplying a rinse liquid, which is a deionized water, to a front surface of a substrate held by a substrate holding unit while rotating the substrate at a first rotation speed such that the rinse liquid spreads over the entire front surface of the substrate; a liquid mixture film forming step of forming a liquid film of a liquid mixture of water and an isopropyl alcohol having a smaller surface tension than the water on the entire front surface of the substrate held by the substrate holding unit after the water rinsing step by supplying the water and the isopropyl alcohol to the entire front surface of the substrate while reducing the rotation speed of the substrate from the first rotation speed to a second rotation speed that is lower than the first rotation speed, wherein a mixing ratio of the isopropyl alcohol to the water ranges, by weight, from 5% to 10%; and an isopropyl alcohol replacing step of replacing the liquid mixture supplied to the front surface of the substrate held by the substrate holding unit in the liquid mixture film forming step with the isopropyl alcohol after the liquid mixture film forming step by supplying the isopropyl alcohol to the front surface of the substrate.