Wafer processes such as oxidation and annealing require a controlled temperature profile and process gas, along with a record of actual conditions for each run. Requirements depend on the material, process step, and equipment.
- Define temperature setpoints, uniformity, ramp rates, and hold times.
- Specify gas composition, purity, flow, and pressure for the process step.
- Link run data and alarms to the lot, equipment, and recipe version.
Temperature control
Identify whether the equipment is a batch furnace or a single-wafer system. Define measurement locations, wafer temperature uniformity, and allowable variation. Record ramp, hold, and cooling stages against the process recipe.
Process atmosphere and cleanliness
Thermal oxidation and annealing serve different purposes. Specify gas composition, purity, and pressure for each step. Identify gas delivery interfaces, monitoring points, and cleanliness requirements before selecting a control approach.
Run records and traceability
Link lot or wafer identifiers to the equipment, recipe version, measured temperature and gas parameters, alarms, and run outcomes so deviations can be traced.
Reference: ASML’s chipmaking process
Frequently asked questions
Do all wafer thermal processes use the same atmosphere?
The atmosphere depends on the process. Thermal oxidation uses an oxidizing atmosphere. Annealing may use an inert or another controlled atmosphere, depending on the process requirements.
What information helps with equipment selection?
Provide the wafer material and size, process step, target temperature profile, gas specifications, equipment interfaces, and recording requirements.