Stepper 1 (GCA 6300)

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Stepper 1 (GCA 6300)
Location Bay 7
Tool Type Lithography
Manufacturer GCA
Description GCA 6300 I-Line Wafer Stepper

Primary Supervisor Biljana Stamenic
(805) 893-4002

Secondary Supervisor

Bill Millerski


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Our GCA wafer stepper is an i-line (365 nm) step and repeat exposure tool for doing lithography that requires high resolution and/or critical alignment. The system has been modified to accept piece parts (down to ~15 mm x 15 mm) up to 6” diameter wafers using manual wafer loading. The maximum square die size is 14.8mm x 14.8mm. The system has an Olympus 2142 (N.A. = 0.42) lens that reduces the mask image by 5 x and gives an ultimate resolution of ~ 0.5 um in the center of the lens field. The system can easily produce 0.7 um isolated lines across the entire field. Autofocus is used to determine the sample surface relative to the lens, making the focus stable and repeatable for different thickness of wafer. The stages are controlled by stepper motors and laser interferometers. Using the global, manual alignment, better than 0.25 um alignment error is achievable. Using the DFAS local alignment system, alignment error better than 0.15 um is achieved. With the 350 W Hg arc lamp, we get approximately 180 mW/cm² of i-line intensity at the wafer.

The system is computer controlled with the capability to program and save a wide variety of exposure jobs. We also have unlimited phone support for system problems through a service contract. The laboratory contains a variety of i-line compatible photoresists. SPR955CM-0.9 for 0.7-1.0 um thick positive processes. AZ5214E for 1.0-2.0 um thick image reversal (negative) process. SPR955CM-1.8 for 1.5-2.0 um thick positive processes. SPR220-3 for 2.5-5 um thick positive process. SPR220-7 for > 5 um thick positive processes. AZnLOF5510 for 1.0um and AZnLOF 2020 for 1.5-3 um negative resist process. Shipley LOL-2000 is also used as an underlayer for high resolution lift-off processes.

Tutorial: If you are not familiar with the differences between Contact Litho and Stepper Litho, please review this short tutorial: Demis D. John - Stepper_Reticle_Layout_vs_Wafer_Layout.pdf

Detailed Specifications

  • Lens: Olympus 2142: NA = 0.42; Depth of field = 1.2 um for 0.7 um process
  • Maximum die size: ~15 mm x 15 mm
  • Resolution: 500 nm over portion of field; 700 nm over entire field
  • Registration tolerance: Max 0.30 um global alignment; Max 0.15 um local alignment (with care, you can achieve < 0.10 um registration)
  • Minimum substrate size: ~ 10 x 10 mm
  • Computer programmable recipes saved on hard disk

Process Information

CAD Files

Service Provider

Operating Procedures

Staff Procedures

These procedures are for Staff use - contact staff if you think you need to run these!