Browse Prior Art Database

SYSTEM AND METHOD FOR PROVIDING A BLENDED CHEMICAL MIXTURE

IP.com Disclosure Number: IPCOM000168056D
Publication Date: 2008-Feb-28
Document File: 5 page(s) / 77K

Publishing Venue

The IP.com Prior Art Database

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 53% of the total text.

SYSTEM AND METHOD FOR PROVIDING A BLENDED CHEMICAL MIXTURE

Background

Field of the Invention

            This disclosure pertains to methods and systems for the management of chemicals in processing environments, such as semiconductor fabrication environments.

Related Art

            In various industries, chemical delivery systems are used to supply chemicals to processing tools.  Illustrative industries include the semiconductor industry, pharmaceutical industry, biomedical industry, food processing industry, household product industry, personal care products industry, petroleum industry and others.

            The chemicals being delivered by a given chemical delivery system depend, of course, on the particular processes being performed.  Accordingly, the particular chemicals supplied to semiconductor processing tools depend on the processes being performed on wafers in the tools.  Illustrative semiconductor processes include etching, cleaning, chemical mechanical polishing (CMP) and wet deposition (e.g., chemical vapor deposition, electroplating, etc.).

            Commonly, two or more fluids are combined to form a desired solution for a particular process.  The solution mixtures can be prepared off-site and then shipped to an end point location or a point-of-use for a given process.  This approach is typically referred to as batch processing or batching.  Alternatively, and more desirably, the cleaning solution mixtures are prepared at the point-of-use with a suitable mixer or blender system prior to delivery to the cleaning process.  The latter approach is sometimes referred as continuous blending.

            In either case, accurate mixing of reagents at desired ratios is particularly important because variations in concentration of the chemicals detrimentally affect process performance.  For example, failure to maintain specified concentrations of chemicals for an etch process can introduce uncertainty in etch rates and, hence, is a source of process variation.

In today’s processing environment there also exists a need to accurately deliver a blended chemical...