Patent ID: 9548197
Date: 2017-01-17
CPC Classifications: B08B,H01L

Claim:
1. A substrate treatment method comprising: a chemical liquid step of supplying a chemical liquid to a rotation center of a front surface of a rotating substrate to treat the front surface of the substrate with the chemical liquid; and a rinsing step of supplying a rinse liquid to the front surface of the rotating substrate after the chemical liquid step to rinse away the chemical liquid from the front surface of the substrate with the rinse liquid and form a liquid film of the rinse liquid; wherein the rinsing step includes a first rinsing step of supplying the rinse liquid to the rotation center of the front surface while rotating the substrate at a predetermined first rotation speed and form the liquid film of the rinse liquid to cover the entire front surface of the substrate with the liquid film so as to wash away the chemical liquid adhered to the front surface of the substrate, a first deceleration rinsing step of decelerating a rotation of the substrate from the first rotation speed to a second rotation speed lower than the first rotation speed at a predetermined deceleration rate while supplying the rinse liquid to the rotation center of the front surface of the substrate so as to keep the entire front surface of the substrate covered with the liquid film of the rinse liquid after the first rinsing step, and a second deceleration rinsing step of decelerating a rotation speed of the substrate from the second rotation speed to zero or to a third rotation speed of less than about 20 rpm at a deceleration rate that is lower than the predetermined deceleration rate in the first deceleration rinsing step, so as to form a liquid film covered over the entire front surface of the substrate after the first deceleration rinsing step, wherein the second deceleration rinsing step includes a step of supplying the rinse liquid to the front surface of the substrate at a supply flow rate higher than a maximum supply flow rate employed in the first rinsing step.