Pyrolytic Boron Nitride (PBN) Thermal Shield & Reflector

Optimizing Thermal Uniformity in Semiconductor Epitaxy

In the production of high-quality epitaxial wafers using MOCVD or MBE equipment, engineers often struggle with uneven thermal distribution and chamber contamination. The root cause frequently traces back to the thermal management materials. Upgrading your heating assembly to a high-purity PBN thermal shield provides a highly reliable solution for temperature control and contamination prevention.

1. Eradicating Outgassing in UHV Environments

At temperatures exceeding 1200°C in an Ultra-High Vacuum (UHV) environment, standard ceramics will release trapped gases due to internal binders. Telite Ceramics utilizes a Chemical Vapor Deposition (CVD) process to manufacture our components. Achieving a purity of ≥99.99%, our MBE thermal components are 100% binder-free. This guarantees zero outgassing, ensuring that your delicate epitaxial films remain completely uncontaminated.

2. Harnessing Thermal Anisotropy for Directional Shielding

The crystallographic structure of PBN provides unique thermal anisotropy. In the in-plane direction, it conducts heat rapidly, acting to equalize temperatures; in the out-of-plane direction, it acts as an exceptional insulator. This dual characteristic makes it a highly effective pyrolytic boron nitride reflector. By accurately redirecting radiant heat from the heating elements back into the target zone, it significantly reduces thermal loss and improves the temperature uniformity across the wafer.

3. Precision Machining for Complex Assemblies

Advanced semiconductor equipment requires strictly toleranced components. From intricately designed MOCVD ceramic parts to a precisely dimensioned PBN insulating ring for heater fixing, Telite Ceramics employs specialized CNC machining. Our processing ensures clean, non-shedding edges, guaranteeing that no micro-particles are generated during frequent thermal shock cycles. These components arrive ready for direct deployment into your cleanroom assembly.