Maintaining flow rate of a fluid

摘要

A pressure gauge may be coupled to a supply line which carries liquid from a bottle to either one or more mixing vessels and/or one or more reactors in a combinatorial processing tool. A control device may monitor the pressure measured by the pressure gauge, and the control device may be configured to change the pressure supplied to the bottle based on a comparison of the measured pressure to a predetermined pressure value. The control device may adjust the pressure provided to the bottle using a pressure regulator coupled to the pressure source. By changing the pressure provided to the bottle, the control device may maintain a relatively constant flow rate of fluids from the liquid source into one or more mixing vessels and/or the one or more reactors.

主权项

1. A wet processing tool configured to process multiple regions of a substrate combinatorially, comprising:
a vessel configured to hold a semiconductor processing liquid; a pressurized gas source in fluid communication with the vessel; a pressure regulator in fluid communication with the vessel and the pressurized gas source, the pressure regulator configured to regulate a pressure of pressurized gas provided from the pressurized gas source to the vessel; a first supply line in fluid communication with the vessel; a pressure sensing device in fluid communication with the first supply line, wherein the pressure sensing device is configured to detect a pressure of processing liquid flowing from the vessel through the first supply line and generate a signal representative thereof; a supply manifold in fluid communication with the pressure sensing device; a plurality of secondary supply lines, each supply line of the plurality of secondary supply lines being in fluid communication with the manifold; a plurality of flow cells, each flow cell of the plurality of flow cells being in fluid communication with a respective one of the plurality of secondary supply lines and being configured to isolate one of a plurality of site isolated regions on a substrate from the others of the plurality of site isolated regions on the substrate; and a controller coupled to the pressure regulator and the pressure sensing device, wherein the controller is configured to receive the detected pressure of processing liquid flowing from the vessel through the first supply line from the pressure sensing device, compare the detected pressure to a predetermined pressure value, and regulate the pressure of pressurized gas provided from the pressurized gas source to the vessel using the pressure regulator based on the comparison.