LPE Reactor, developed for the Special Requirements of Growth of II-VI Compound Semiconductors. MCT HgCdTe-Epitaxy for Thermal Imaging Applications.
LPE-Equipment for II-VI Technologies
The LPE Reactor ESY–10/S Concept was developed by SOF Optoelectronics for the special Requirements of LPE-Growth of II-VI Compound Semiconductors such as HgCdTe. Its high Capacity of 200cm² per epitaxial Process combined with its unique Crucible Material and Design for Melt Homogenization are the leading Features of this Equipment, which is operating successfully worldwide in various Applications.
In Addition to the standard ESY–10/S Furnace for industrial and R&D Use, Customer-designed Solutions with Plenty of Options can be realised. The ESY–10/S can be supplemented perfectly with an integrated independent Annealing Furnace System. A sealed Nitrogen Loading-Glove-Box enables the Operator to load and unload the Furnace Tubes under protective Atmosphere.
Application: MCT-Epitaxy for Thermal Imaging Systems
A main Application Area for the epitaxial Layers from our ESY–10/S Equipment are MCT-based Infrared Systems (MCT: Mercury Cadmium Telluride or HgCdTe) for High-Performance Thermal Cameras and Sensors. These Devices are widely in Use, mainly for Military Purposes. Since the Beginning of the COVID-19 Pandemic in 2020 another Application Field for Thermal Imaging Systems has grown rapidly: the Use as Fever Detection System to identify possibly infected Persons.
Available Production Technologies
- Far-Infrared Detectors
- Wide Band-Gap Detectors
- Wide Band-Gap Emitters (LEDs)
LPE Furnace – Technical Highlights
- Single or 2-Tube Combination-Furnace with Vertical LPE and Annealing Quartz Tube
- 3 Heating Zones for Epitaxy and 1 independent Heating Zone for Hg-Source
- Hg-Vapor-Source inside Furnace Tube
- Temperatures up to 750°C
- Temperature Regulation Accuracy: ± 0.5 °C
- Suitable for Wafers up to 49 cm²
- Up to 6 Wafers per Epitaxial Process
- Perfect Layer Growth
- Easy removing of Solid Melt after Process
- Wafer Surface Protection
before and after Epi-Growth
- Fully automatic Computer-Controlled Processing
- Data-Logging of all Process-Parameters
- Closed Loading-Glove-Box with N2-Atmosphere
The Working Principle of the ESY–10/S
The Working Principle of the LPE-Equipment Unit is the Technology of Liquid Phase Epitaxy (LPE) utilizing a rotating-dipping Boat Technique. The Substrates, positioned at the 4 outside Surfaces of a Cubic Graphite Block (Substrate Holder), are dipped into the Melt at high Temperatures < 600°C.
The Substrate Holder can be rotated during Deposition of the Layer, which is realized by controlled Cooling of the whole Crucible system with Substrates and Melt. The inner graphite Crucible is almost sealed against outer Tube Atmosphere to minimize loss of vaporized Mercury. This remaining Loss can be compensated by using an independently heated built-in Hg-Source.
Unique Crucible Design and Material lead to perfect Wafer Surface Protection, Layer Growth and easy Removing of solid Melt after epitaxial Growth.
Pictures of ESY–10/S
SOF Optoelectronics GmbH
Phone +49 (0) 2403-508966
Fax +49 (0) 2403-508968