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Lithography Solvent Bench, lithosolv

The lithosolv wet bench is used for handling solvents or other volatile organics such as photoresist. Processes performed here include mask and substrate cleaning and pouring resist into smaller containers for manual dispensing. Acids and bases (namely, developers) must never be handled here. Liquid waste is collected locally. A solid hazardous waste under the benchtop is used to collect cleanroom wipes, vinyl gloves, swabs, and other solid materials which may be contaminated with solvents and photoresist.

Picture and Location

 Lithography Solvent Bench

The tool is located at DE1 on the Lab Map.

Process Capabilities

Cleanliness Standard

 The lithosolv appears in all three equipment groups (clean, semiclean, and gold)


 

How to Become a User

  1. "All Litho" is required before training on any of the lithography tools. Contact the trainers for the class schedule and training materials (which must be reviewed before the class). If no training hours are indicated, training for the tool is covered in the "All Litho" session.
  2. Contact SNF training contact on the Equipment Summary page.

Operating Procedures

SOLVENTS ONLY!! (Wear the proper -- solvent resistant gloves)

o       NO ACIDS OR BASES ALLOWED AT THIS BENCH.

CONTAINERS OF SOLVENTS:

o       Keep all opened containers of solvent back at least 6 inches from the front of the exhaust hood. The red tape indicates 6 inches.

o       Leave containers not longer than one day at this bench.

o       Cover any open container of resist or chemical with foil, fill out a "blue card", and use a metal cart when transferring it to the coaters.

GLASSWARE:

o       All glassware at this bench is gold contaminated. If you use contaminated glassware, your work will be gold contaminated. You will only be allowed to use equipment that allows gold (see MATERIALS section on our website).

o       For non-gold contaminated work, use your own designated glassware.

§         labeled with your name and contamination level

§         stored in your plastic storage bin

PHOTORESIST DISPOSAL:

o       Photoresist should be disposed of in the carboy (not down the drain -- it could plug up the drain). Replace the cap on the carboy after use.

o       Never pour used resist or any other chemical back to the original bottle!!

SOLVENT COLLECTION:

o       Chlorobenzene must be collected separately in one gallon plastic bottle with a white hazards tag on it.

o       Preferably pour all solvents, resist or HMDS in the carboy!

o       Notify maintenance if the red light (located above the exhaust hood) is ON. It means the waste tank for the solvent bench is full and no solvents should be poured down the drain.

BLUE "IN-USE HAZARDOUS CHEMICALS" LABELS:

o       Must be completely filled out and left along side all open containers of chemicals (beakers..)

o       Full chemical names of all chemicals in the solution must be listed.

o       At this bench ONLY you may use the product name, if there is an MSDS sheet in the book located at the bench for the product (i.e. Shipley 3612 has an MSDS sheet in the book)

SOLVENT, RESIST OR HMDS CONTAMINATED ITEMS: Q-TIPS, WIPES, GLOVES…

Use the red bucket (stored under this bench) for disposal of solvent, resist or HMDS contaminated items:

o       Work under the exhaust hood: put contaminated items in Zip Lock bag (you find some on top of this bench or in the stock room)

o       Place the Zip Lock bag inside of the red bucket under the bench

o       Note: Broken contaminated glassware should also go into this bucket

o       When red bucket is full: seal the yellow hazardous waste bag with a tie-wrap and transfer the bag to the large gray container under the Solvent Bench behind the red bucket (make sure the top is replaced securely). Tie-wraps and extra plastic bags are located on top of the gray container or in the stock room.

CLEAN UP:
- Do NOT leave bottles of resist at the bench (they should be stored in the yellow solvent cabinets in the back maintenance isle behind the furnaces)
- Refill solvent bottles when needed
- Clean up the bench after using it

SOLVENTS ODORS:
- Notify staff immediately if any smell has been detected while working at this bench

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