Thin film coatings are indispensable today in numerous industries—from optics and electronics to sensor technology and renewable energy. Precise vacuum measurement technology forms the basis for reproducible processes and high coating quality.
Application Areas of Thin Film Coating
In thin film coating, functional material layers in the nano- to micrometer range are selectively deposited onto substrates. Depending on process requirements, optical, electrical, or mechanical properties are deliberately modified. Typical fields of application include:
- Optical coatings: Anti-reflective, mirror, and filter coatings for eyeglasses, sensors, imaging systems, and laser optics
- Electronics & photovoltaics: Conductive and semiconducting layers for semiconductor manufacturing, solar modules, and sensor technology
- Protective and functional coatings: Hard coatings and barrier layers, corrosion protection, or hydrophobic surfaces
For all applications layer thickness and material properties depend directly on stable pressure conditions during the process.
Relevant Thin-Film Deposition Processes
Physical Vapor Deposition (PVD)
In evaporation, sputtering, or arc processes, material is released from a target and deposited onto the substrate under vacuum. Most PVD processes operate in the high-vacuum range to minimize contamination and ensure reproducible coating properties.
Chemical Vapor Deposition (CVD)
The CVD process uses chemical reactions in the gas phase to produce a solid layer on the substrate. Applications range from dielectric layers in microelectronics to hard coatings for tools. Process pressure influences reaction rates, layer density, and gas-phase chemistry—accordingly, the requirements for measurement accuracy are high.
The Role of Vacuum Measurement Technology
Creating the required vacuum environment, as well as controlling and regulating pressures, is essential for reproducible process operation. Only when pressure remains within a defined range can high end-product quality be ensured. Suitable vacuum measurement technology provides precise process control by regulating pressure in both the fore-vacuum chamber and the high-vacuum chamber.
Suitable Vacuum Transducers
VSH – Pirani/Hot Cathode – 1000 bis 5e-10 mbar: The digital combination transducer covers the entire range from atmosphere to ultra-high vacuum.
Advantages:
- Automatic activation of the hot cathode only at low pressure → extended service life
- Separate gas correction factors for Pirani and hot cathode
- High measurement accuracy and excellent reproducibility
→ Go directly to VSH
VSM – Pirani/Cold Cathode – 1000 bis 5e-9 mbar: The VSM combines a Pirani sensor with a cold cathode sensor.
Advantages:
- Cold cathode is switched-on only in low pressure range → maximum protection and higher process availability
- Individually configurable transition between Pirani and cold cathode
- Overpressure stability up to 16 bar
→ Go directly to VSM
Conclusion
Thin film coating is a key technology for many application areas. Modern vacuum measurement technology from Thyracont supports stable process control, precise coating thickness regulation, and consistently high product quality.
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