Cleaning bench for removing contaminants from semiconductor process equipment
View Patent ↗Described are cleaning benches and methods for removing contaminant layers from semiconductor process components using small volumes of hazardous liquids and minimizing cross-contamination between components from different deposition chambers. Components to be cleaned are stored within or supported by a dedicated cassette before they are placed in a receptacle of cleaning liquid. The cassette displaces a significant percentage of the receptacle's volume; consequently, only a relatively small volume of cleaning liquid is needed to fully submerge the component. In typical embodiments, the combined cassette and component displace a volume of liquid that is greater than the volume of liquid used to clean the component. The cleaning bench can include different chemical baths for different components. Cassettes dedicated for use with particular components can be keyed to particular receptacles.
1. A method of removing contaminant layers from a plurality of differently shaped semiconductor process components, the method comprising:
a. providing a test bench with a plurality of receptacles, including a first receptacle having a first receptacle volume and a second receptacle having a second receptacle volume;
b. providing a plurality of cassettes, each cassette formed to admit one of the components;
c. inserting a first of the plurality of components in a first of the plurality of cassettes and a second of the plurality of components in a second of the plurality of cassettes;
d. inserting the first cassette, including the first component, into the first receptacle, wherein the first cassette and the first component displace at least half of the first receptacle volume; and
e. inserting the second cassette, including the second component, into the second receptacle, wherein the second cassette and the second component displace at least half of the second receptacle volume.
2. The method of claim 1 , further comprising keying the first cassette to the first receptacle and keying the second cassette to the second receptacle.
3. The method of claim 1 , further comprising hanging a subset of the plurality of cassettes in the test bench.
4. The method of claim 1 , further comprising identifying the first cassette as corresponding to the first component and identifying the second cassette as corresponding to the second component.