contact etch film

# Contact Etch Film

Contact Etch Film describes the target and protected films in this removal module.

## Identify the target film

Name the material intended for removal separately from the mask and the protected landing. Measure incoming thickness and surface state; film names alone do not specify etch behavior.

## Integration context

A contact opening passes through interlayer dielectric and, where used, a contact etch stop layer before reaching a device contact landing. CESL means contact etch stop layer. Oxide removal and nitride opening may require separate controlled steps; an oxide endpoint does not prove the final landing is exposed.

## What to verify

Check bottom CD, dielectric clearing, landing damage and contact resistance after fill.

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

contact etch film. Short abbreviations are local process vocabulary and can have other meanings; use the full module name when searching.

## Source and scope

[Reactive ion etching capabilities](https://www.nanofab.ualberta.ca/capabilities/plasma-etch/). The diagram is an original teaching schematic. Layer choices and process families describe an example rather than a universal manufacturing recipe.