thermal silicon dioxide

# Thermal SiO₂ (Th-Ox / TOX)

Thermal silicon dioxide is grown by reacting silicon with an oxidizing ambient.

## Connect the name to its role

Document whether this film is a target, mask, liner, electrode or temporary layer at the step being discussed. The same material can have different roles in different modules.

## Integration context

Growth consumes silicon and creates a silicon/oxide interface; depositing oxide adds a film through a different mechanism. Th-Ox can mean thermal oxide, while tox or TOX may denote oxide thickness in device models rather than a material name. Dry and wet oxidation are different growth conditions, not wet-etch operations.

## What to verify

Record growth history, thickness and intended role. Do not infer oxide etch rate solely from the abbreviation.

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

thermal silicon dioxide, thermal SiO2, Th-Ox, TOX. Short abbreviations are local process vocabulary and can have other meanings; use the full module name when searching.

## Source and scope

[Thermal oxide growth and deposited films](https://www.nanofab.ualberta.ca/capabilities/thin-film-deposition/). The diagram is an original teaching schematic. Layer choices and process families describe an example rather than a universal manufacturing recipe.