By 2031, the combined market size of compound semiconductor substrates and open epitaxial wafers is expected to approach US$5.2 billion, with a CAGR of approximately 14%.
Automotive electrification is driving the growth of the silicon carbide (SiC) substrate market. The radio frequency (RF) field remains dominated by gallium arsenide (GaAs) and gallium nitride (GaN), while indium phosphide (InP) is accelerating the development of photonics technology. Light-emitting diodes (LEDs) and microLEDs rely on gallium nitride, gallium arsenide, sapphire, and silicon-based platforms.
The compound semiconductor supply chain is consolidating around leading companies: Wolfspeed and Coherent in the silicon carbide wafer field, Infineon Technologies in the power device field, IQE in the epitaxial wafer field, and Sumitomo Chemical in the compound materials field.
The core of technological development focuses on wafer size upgrades: silicon carbide wafers are transitioning to 8-inch wafers, indium phosphide wafers are moving towards 6-inch wafers, and gallium nitride-on-silicon (GaN-on-Si) technology is demonstrating application potential for 12-inch wafers.
Although some sub-sectors face short-term price pressures, the electrification of automobiles, the expansion of artificial intelligence infrastructure, and the development of next-generation communication technologies continue to solidify the long-term market demand for compound semiconductor materials such as silicon carbide, gallium nitride, gallium arsenide, and indium phosphide.
From 2025 to 2031, the overall market for compound semiconductor substrates and open epitaxial wafers is projected to grow at a CAGR of approximately 14%, exceeding $5 billion by 2031.
Ahmed Abbas of the French market research firm Yole stated that silicon carbide power devices remain the core pillar of market expansion, and the diversified development of market growth is noteworthy. In this latest report, we can see that the industry structure is becoming more stable and the development more balanced.
With its significant performance advantages, the industrial application of compound semiconductors is accelerating. Yole Group analysts are closely monitoring this transformation trend across various market segments:
Power electronics remains the primary engine of market growth. Driven by the increasing adoption of electric vehicles, the promotion of 800V electrical architectures, on-board chargers, renewable energy systems, and industrial electrification, the market size for N-type silicon carbide substrates alone is expected to exceed $2 billion by 2031.
Silicon carbide wafers are rapidly upgrading from 6-inch to 8-inch wafers, a transformation that accelerates cost reduction and industrial scaling. Although recent price pressures from overcapacity and the return to normal demand in the automotive market have strengthened the silicon carbide sector's long-term market competitiveness, the wafer size upgrade has solidified its position.
The application areas of gallium nitride (GaN) power devices are also expanding, gradually moving from fast charging in consumer electronics to automotive and data center applications, further enhancing its strategic importance as a complementary technology to power semiconductors.
Yole's Ooshun Chiu stated: From silicon carbide enabling efficient power transmission in data centers to indium phosphide supporting the development of high-speed optical interconnect technology, compound semiconductor materials have become a core support for the large-scale construction of artificial intelligence infrastructure.
In the radio frequency (RF) market, gallium arsenide (GaAs) continues to dominate the mobile phone front-end module sector; gallium nitride (GaN), on the other hand, continues to make breakthroughs in communication infrastructure and defense applications, and with the deployment of 6G technology, it has broad long-term development prospects.
Photonics: The Most Dynamic Growth Sector
Photonics is the most dynamic segment among all compound semiconductor sub-sectors. Driven by artificial intelligence data centers, high-speed optical transceiver modules, and co-packaged optical architectures, the CAGR of the indium phosphide (IP) substrate market will exceed 18% before 2031.
The upgrade of IPN wafers to a 6-inch platform has not only improved product performance but also increased manufacturing efficiency.
Meanwhile, the LED market has matured, and the industrial application of MicroLED is steadily progressing, currently being implemented first in high-end wearable devices and display terminal applications.