gate poly etch filmstack

# Gate Poly Etch Filmstack

Gate Poly Etch Filmstack describes the ordered materials and their roles in this pattern-transfer example.

## Read the interfaces

The stack is listed from the top surface downward in this example. State which films must clear and which must remain. Interface opening, bulk removal and landing can need different process conditions.

## Integration context

This is a conventional patterned polysilicon gate over a gate dielectric. BARC is an optional bottom antireflective coating; its opening is separate from native-oxide breakthrough. Main removal and a selective landing step must preserve the thin gate dielectric and avoid silicon recess.

## What to verify

Check gate CD, residual poly, gate dielectric loss and electrical damage.

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

gate poly etch filmstack, gate poly etch film stack. Short abbreviations are local process vocabulary and can have other meanings; use the full module name when searching.

## Source and scope

[Fabrication and etch 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.