BARC open

# BARC Open (BO)

BARC opening clears bottom antireflective coating in developed resist openings.

## Place the step in context

Identify the incoming surface, the intended transformation and the surface delivered to the next module. A local abbreviation does not define chemistry, exposure time or acceptance limits.

## Integration context

Organic and inorganic antireflective coatings need different removal approaches. An opening step should clear the coating without excessive resist loss or premature target attack. BO is local recipe shorthand rather than a universal mask level.

## What to verify

Verify complete coating clear and transfer CD; distinguish BARC open from a light resist descum.

Before selecting removal conditions, identify all exposed neighboring materials and the amount of loss each can tolerate. Verify the result using the measurements appropriate to the structure, then check that the surface is suitable for the next deposition, contact or clean step.

## Related terminology

BARC open, BO. Short abbreviations are local process vocabulary and can have other meanings; use the full module name when searching.

## Source and scope

[Etch process resources](https://www.cleanroom.byu.edu/processes). The diagram is an original teaching schematic. Layer choices and process families describe an example rather than a universal manufacturing recipe.