CVD Equipment

CVD Chamber Architecture

A modern CVD chamber is a precisely engineered reaction vessel:

• Showerhead: A perforated plate that distributes process gases uniformly over the wafer. Hole pattern and size are engineered for flow uniformity.
• Heated chuck (susceptor): Holds the wafer and heats it to 200–900°C depending on the process. Temperature uniformity of ±1°C across 300mm is critical.
• Plasma source (PECVD): RF electrodes generate plasma to enable low-temperature deposition. Can be direct (between showerhead and wafer) or remote.
• Exhaust/pump: Turbo and dry pumps maintain 0.1–10 Torr pressure with precise throttle valve control.
• Gas delivery system: Mass flow controllers (MFCs) meter process gases with <1% accuracy. Multiple gas lines for precursors, carriers, and purge gases.

Sensors and Process Data

CVD tools generate enormous amounts of sensor data — exactly the kind of data ML engineers work with:

• Temperature: Multi-zone heater readings, pyrometer data (10+ sensors per chamber)
• Pressure: Chamber pressure, foreline pressure, individual gas line pressures
• Gas flow: MFC setpoints and actual flows for each gas line
• RF power: Forward/reflected power, voltage, current, impedance (for PECVD)
• Optical emission: Plasma emission spectra for process monitoring
• Thickness: In-situ ellipsometry or reflectometry for real-time film measurement

A single deposition run generates thousands of data points per second across 50–100+ parameters. This is the raw material for virtual metrology and predictive maintenance models.