We Can Figure This Out.org
Virtual Lab: Making an Integrated Circuit (IC)
University of Virginia
© 2003-Present, John C. Bean
Mask #3 for contact windows:

A photographic emulsion is applied.

Portions of emulsion are exposed to UV light projecting thru a shadow mask.

Where UV light strikes the emulsion it breaks molecular bonds.

The regions of weakened emulsion are removed by solvent.

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