Corial D350L PECVD system

Fast and uniform deposition of large batch capacity or 300 mm wafers, in a reliable, production-ready PECVD system

Corial D350L PECVD system in brief

The Corial D350L PECVD system is designed to produce high-quality, uniform films for photonics, optoelectronics & MEMS devices manufacturing.

The Corial D350L is based on CORIAL’s unique reactor design. It houses an isothermal, pressurized reactor within a vacuum vessel, which is different from conventional PECVD reactors with heated substrate holders.

Featuring a next-generation gas showerhead and symmetrical pumping, the Corial D350L delivers excellent deposition uniformity for a wide variety of applications.

Equipped with a vacuum load lock, the Corial D350L also guarantees stable process conditions, short pumping cycles and enhanced throughput.


The Corial D350L PECVD system handles full 300 mm wafers or large batch capacity (27 x 2”), enabling volume production of high-quality films. Typical applications addressed by this PECVD tool include passivation deposition for optoelectronics, deposition of silicon oxides for photonics, and sacrificial layer deposition for MEMS. Stress control of the films is simplified and optimized on account of the symmetrical design of the reactor.

The Corial D350 PECVD system can operate for years without need for manual cleaning.

Key benefits



Precise and uniform temperature control of the substrate and reactor walls delivers excellent deposition repeatability and uniformity

The pressurized, symmetrically-pumped reactor ensures high-quality films free of pinholes



With its isothermal, pressurized reactor, the Corial D350L rapidly deposits uniform films on wafers up to 300 mm in diameter

Typical performance: SiO2: >500 nm/min; Si3N4: 250 nm/min; SiOCH: 150 nm/min; SiC: 100 nm/min



Film stress control is simple to achieve, thanks to the reactor’s symmetrical design

The Corial D350L heating system enables precise control and optimization of refractive index and wet chemical etch rate



The Corial D350L high temperature, dual pumped configuration enables efficient plasma cleaning at operating temperature, with no corrosion of mechanical parts

No manual cleaning of reactor and vacuum vessel required for many years of operation

Load lock ensures fast loading/unloading and short pump-down times

 Related processes

Typical materials deposited with the Corial D350L PECVD system include silicon-based compounds such as SiO2, Si3N4, SiOCH, SiOF, and aSi-H at high temperature (325°C).

The Corial D350L has been specifically design for production of films for photonics, optoelectronics and MEMS markets.

PECVD of Silicon Nitride (Si3N4) film with tensile stress


  • Deposition rate 50 nm/min
  • Refractive index 1.91
  • Stress 220 ± 50

Stress-less deposition of Silicon Nitride (Si3N4) film


  • Deposition rate 75 nm/min
  • Refractive index 1.91
  • Stress 0 ± 50 MPa

PECVD of Silicon Nitride (Si3N4) film with compressive stress


  • Deposition rate 75 nm/min
  • Refractive index 1.91
  • Stress -180 ± 50 MPa

PECVD of Silicon Nitride (Si3N4) film for photodiode passivation


  • Deposition rate 20 nm/min
  • Refractive index 2.02
  • RF power 50 W


The Corial D350L PECVD system can be thoroughly customized with a wide range of features.

Additional gas inputs

Additional gas inputs

Additional gas inputs (up to 8) for more complex process gas combinations

Light tower

The signal light tower provides an easy-to-view indicator of the system’s processing status

Laser interferometry

End point detection by laser interferometry to enhance etch control through automated measurement of etch rate and etch depth

End point detection by laser interferometry to enhance process control through automated measurement of etch/deposition rate, etch depth and deposition thickness