Patent ID: 11883858
Assignee: SCREEN HOLDINGS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC B  H | IPC B  H

Claim 5:
6. A substrate processing apparatus for removing a resist from a substrate with SPM that is a liquid mixture of sulfuric acid and hydrogen peroxide water, the apparatus comprising:
a substrate holding unit which holds a substrate;
a nozzle having a spout and adapted to spout SPM from the spout toward the substrate held by the substrate holding unit;
a mixing portion communicating with the spout;
a sulfuric acid-containing liquid supply device which recovers liquid supplied to and expelled from the substrate held by the substrate holding unit, prepares a sulfuric acid-containing liquid from the recovered liquid, and supplies the prepared sulfuric acid-containing liquid to the mixing portion; and
a hydrogen peroxide water supply unit which supplies hydrogen peroxide water to the mixing portion;
wherein the sulfuric acid-containing liquid supply device comprises a first liquid storage, and a second liquid storage,
wherein the first liquid storage comprises:
a first tank which stores the recovered liquid; and
a sulfuric acid adding unit which adds sulfuric acid not originated from the recovered liquid to the first tank,
wherein the second liquid storage comprises:
a second tank which stores liquid supplied from the first tank;
a first pipe having opposite ends connected to the second tank so that the liquid stored in the second tank is circulated therethrough; and
a first heater which heats the liquid circulated through the second tank and the first pipe,
wherein the first liquid storage further comprises:
a second pipe having opposite ends connected to the first tank so that the sulfuric acid-containing liquid stored in the first tank is circulated therethrough; and
a second heater which heats the sulfuric acid-containing liquid circulated through the first tank and the second pipe.