Patent ID: 11925881
Assignee: ACM RESEARCH (SHANGHAI) INC.
Field: Chemical engineering (Chemistry)
Classification: CPC B  F  H | IPC B  F  H

Claim 10:
11. An apparatus for cleaning substrates, comprising:
a solution tank, containing high temperature chemical solution;
a first pump, an inlet of the first pump connecting to the solution tank, an outlet of the first pump connecting to a buffer tank, the first pump increasing the pressure of the high temperature chemical solution, the pressure at the outlet of the first pump being set to P1;
the buffer tank, having a tank body, a vent line and a needle valve, the tank body containing the high temperature chemical solution output by the first pump, an end of the vent line connecting to the top of the tank body, the other end of the vent line connecting to the solution tank, the needle valve mounted on the vent line, wherein the needle valve is adjusted to reach a flow rate to vent gas bubbles inside of the high temperature chemical solution out of the buffer tank through the vent line on the top of the tank body;
a second pump, an inlet of the second pump connecting to the buffer tank, an outlet of the second pump connecting to a cleaning chamber in which a substrate is cleaned, the pressure at the outlet of the second pump being set to P2 where P2>P1;
a substrate chuck, holding the substrate;
a rotation driving mechanism, connecting to the substrate chuck and driving the substrate chuck to rotate;
a nozzle, delivering the high temperature chemical solution or de-ionized water on the surface of the substrate;
a ultra/mega sonic device, being positioned adjacent to the substrate, a gap formed between the substrate and the ultra/mega sonic device; and
a vertical actuator, driving the ultra/mega sonic device to move up or down for changing the gap between the substrate and the ultra/mega sonic device.