Patent ID: 11869781
Assignee: TOKYO ELECTRON LIMITED
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A substrate processing apparatus, comprising:
a processing tub configured to store therein a processing liquid in which a substrate is immersed to be processed, the processing liquid including a first component and a second component having a boiling point higher than a boiling point of the first component;
an adjusting liquid supply configured to supply an adjusting liquid configured to adjust a concentration of the second component in the processing liquid into the processing tub, the adjusting liquid including the first component;
a controller configured to control an operation of the substrate processing apparatus;
a liquid-level meter configured to measure a liquid surface height; and
a concentration meter configured to measure the concentration,
wherein when an instruction for changing the concentration is received,
the controller is configured to calculate the liquid surface height in the processing tub corresponding to the concentration after being changed based on a concentration difference between a set concentration of the second component after being changed and a set concentration of the second component before being changed, and
wherein the adjusting liquid supply supplies the adjusting liquid into the processing tub based on the calculated liquid surface height and a measurement value of the liquid-level meter,
wherein the concentration meter includes a manometer configured to detect a liquid pressure of the processing liquid as an index of the concentration of the second component, and
the manometer includes a bubble pipe configured to discharge a gas to the processing tub, and a detector configured to detect a back pressure of the gas applied to the bubble pipe corresponding to the liquid pressure of the processing liquid, and
the concentration meter is further configured to measure the concentration of the second component from the back pressure detected by the detector based on a relationship between the concentration of the second component and the liquid pressure stored in a recording medium.