Automotive electrification drives SiC substrates, RF remains led by GaAs and GaN, photonics accelerates with InP, and LED/MicroLED rely on GaN, GaAs, sapphire, and Si platforms.
The supply chain is consolidating around major leaders such as Wolfspeed and Coherent in SiC wafers, Infineon Technologies in power devices, IQE in epitaxy, and Sumitomo in compound materials.
Technology evolution centres on wafer scaling, with SiC transitioning to 8-inch, InP moving to 6-inch, and GaN-on-Si demonstrating 12-inch potential.
Despite short-term pricing pressure in certain segments, electrification, AI infrastructure expansion, and next-generation connectivity are reinforcing long-term demand for compound semiconductor materials, including SiC, GaN, GaAs, and InP.
The combined compound semiconductor substrate and open epiwafer markets are projected to grow to more than $5 billion in 2031, reflecting a ~14% CAGR between 2025 and 2031.
“Power SiC continues to anchor market expansion,” says Yole’s Ahmad Abbas, “what is particularly notable is the diversification of growth. In this new edition, we see this industry becoming structurally stronger and more balanced.
The adoption of compound semiconductors is accelerating thanks to their clear performance advantages. At Yole Group, analysts are closely monitoring this shift across diverse market segments:
Power electronics remains the dominant growth engine. N-type SiC substrates alone are expected to surpass $2 billion by 2031, supported by electric vehicle adoption, 800V architectures, onboard chargers, renewable energy systems, and industrial electrification.
The transition from 6-inch to 8-inch wafers is accelerating cost reduction and scaling efforts, reinforcing SiC’s long-term competitiveness despite recent pricing pressure linked to overcapacity and the normalization of automotive demand.
Power GaN continues expanding beyond consumer fast charging into automotive and data-center applications, strengthening its strategic position as a complementary power technology.
”From SiC enabling efficient power delivery in data centers to InP supporting high-speed optical interconnects, compound materials are becoming essential to scalable AI infrastructure,” says Yole’s Ooshun Chiu.
In RF markets, GaAs maintains leadership in handset front-end modules, while GaN progresses in telecom infrastructure and defense applications, with long-term prospects in 6G deployment.
Photonics represents the most dynamic segment. InP substrates are forecast to grow at more than 18% CAGR through 2031, driven by AI data centers, high-speed optical transceivers, and co-packaged optics architectures.
The transition to 6-inch InP platforms supports both performance scaling and manufacturing efficiency.
Meanwhile, LED remains mature, and MicroLED adoption progresses gradually, beginning with high-end wearable and display applications.
