Semiconductor Epitaxial Thermal Field Comprehensive Selection & Multi-Dimensional Performance Evaluation Guide

Engineering Selection Standard for Susceptors, Heaters, and CVD Coatings | VET Energy

[Executive Summary]
Selecting the optimal thermal field hardware is critical for yield stability in 6-inch and 8-inch silicon and SiC epitaxial reactors. This guide establishes a multi-dimensional evaluation framework encompassing thermal conductivity, chemical compatibility, and mechanical strength.

1. Core Material Selection: Isostatic Graphite vs. CFC Composites

The structural backbone of epitaxial hardware requires exceptional thermal shock resistance and high-temperature mechanical integrity. Fine-grain isostatic graphite provides uniform thermal distribution, whereas carbon-fiber-reinforced carbon (CFC) composites offer superior tensile strength and resistance to thermal warping during rapid thermal cycling up to 1650°C.

2. Coating Technology Selection: CVD SiC vs. CVD TaC

Coating Type	Max Operating Temp	Chemical Resistance	Primary Application
CVD SiC Coating	Up to 1600°C	Excellent against standard HCl/H2	Silicon & SiC Epitaxy Susceptors
CVD TaC Coating	Exceeding 1800°C	Superior against aggressive vapor etching	Ultra-high temp GaN & advanced SiC