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Status of the Compound Semiconductor Industry 2026 - Focus on Substrates and Epiwafers

Feb 2026

AI Datacenters and EVs Fuel Growth: Compound Semiconductors Accelerate Wafer Scaling to $3B by 2031

YINTR26559

Key Features

Compound semiconductors keep gaining share in power, RF and photonics. In 2026, wafers and epiwafers grow ~15% CAGR (25–31), led by SiC in power (8” + EVs), GaN scaling into auto/DC, GaAs stable in RF, and InP rising on AI/datacom.

SiC scales up with new Chinese wafer and epi suppliers, while GaN supply shifts to mixed IDM and fabless and foundry models as some foundries exit and new players add in-house epi. RF is stable, AI datacenters push 6 inch InP, and LEDs and microLED remain vertically integrated.

Beyond silicon, SiC, GaN, GaAs and InP continue to gain ground across power, RF, photonics and display applications, supported by wafer scaling, new capacity and ongoing cost reductions in substrates and epitaxy. SiC transitions to 8’’ wafers, GaN-on-Si ramps in volume, GaAs remains on its established platform, InP progresses toward 6’’, and MicroLED enters a later ramp phase.

What's New

Focus on wafer scaling as the industry witnesses the transition of SiC from 6’’ to 8’’ wafers with new Chinese substrate and epiwafer suppliers entering the market to improve cost competitiveness and address growing open-market 8” demand. In parallel, early demonstrations of 12” SiC are emerging, supported by long-term opportunities in AR/VR and advanced applications.
Scaling extends beyond SiC, with 6” InP entering production for photonics, and 12” GaN-on-Si emerging as a key cost-reduction path toward silicon parity.
Analysis of the ecosystem reshaping, driven by strong vertical integration in Power GaN and LEDs, Chinese players building end-to-end supply chains, IDMs developing multi-material strategies (SiC + GaN + Si), and the impact of new entrants on competition and margins.
The recovery of the LED and MicroLED market is assessed, following Apple’s withdrawal in 2024, with a focus on new applications as the first MicroLED smartwatches and automotive displays enter the market. This is reflected on shipped wafer volume and revenue.

Product objectives

Provide an overview of the GaN RF market.
- What has been the game-changing news in the CS industry over the last few years?
- What are the key drivers growing the CS market?
- What are the CS substrate and epiwafer market values and volumes by application and technology?
- What is the status of the InP photonics market?

To analyze the industry trends for each CS substrate
- What are the opportunities for CS in different market verticals, and how well have they been adopted?
- What about the competition between the various Compound Semiconductors and mature Si technology?

To review the CS ecosystems
- Players and strategies at different levels of the supply chain
- Synergies between industries and players
- Special focus on capacity expansion of players in the CS industry
- Special focus on epitaxy equipment
- Noteworthy investments and partnerships
- The developmental focus in different regions

Technology trends for GaAs, InP, GaN-on-Si, GaN-on-SiC, GaN-on-sapphire, and SiC substrates
- What are the latest technological developments?
- What are the benefits and challenges?
- Technology maturity and substrate size evolution

Power SiC leads wafer economy, RF stabilizes, and photonics accelerates on AI datacom

Compound semiconductors continue to gain momentum thanks to clear performance advantages in power, RF, and photonics.

In the 2026 outlook, growth is reassessed at the substrate and open epiwafer levels, with strong long-term expansion led by n-type SiC and InP, despite near-term pricing pressure and adoption timing adjustments. The total CS substrate market is expected to grow from $1.29B in 2025 to $2.79B in 2031 (14% CAGR), while the open epiwafer market rises from $1.1B to $2.39B (14% CAGR).

Power applications dominate, with n-type SiC driving growth through EV electrification, 800V architectures, and accelerated 8” wafer adoption, even as overcapacity and automotive slowdown weigh on prices short term. Power GaN expands beyond consumer fast charging into automotive and data centers, though its epiwafer opportunity remains smaller than SiC.

RF markets are stable, led by GaAs in handsets and GaN in telecom and defense, with limited near-term upside but steady growth toward 6G. Photonics shows the strongest momentum, driven by AI data centers and bandwidth upgrades, accelerating InP adoption, 6” platforms, and high-speed lasers.

LEDs remain mature and low value, while MicroLED adoption resumes later in the decade under more realistic expectations, starting with wearables and AR.

Scaling Platforms and Applications Shape the Future of Compound Semiconductors

Compound semiconductors play a pivotal role across multiple end applications. Driven by large automotive volumes, rapid AI data center expansion, and stabilized demand in mobile, consumer, and telecom, supply chains are reshaping across materials. Power electronics are the strongest growth driver, supported by heavy Power SiC investments since the early 2020s and recent strategic moves in Power GaN.

SiC growth is fueled by production scaling and the transition from 6” to 8” wafers, with new Chinese wafer and epiwafer suppliers entering to improve cost competitiveness and meet open-market 8” demand. Power GaN is shifting toward mixed IDM and fabless/foundry models, as some foundries exit and new players enter with in-house epitaxy; IDMs view GaN as strategic for data center penetration.

RF markets in mobile and telecom remain stable, with modest GaAs and GaN growth and a focus on consolidation over expansion.

Photonics shows strong momentum driven by AI data centers, accelerating the move to 6” InP for high-speed lasers.

LED and microLED remain mature and consolidated, with vertical integration critical, especially as microLED enters high-end wearables. Larger substrates intensify competition between pure-play compound players and silicon fabs, while Chinese players continue building end-to-end compound semiconductor supply chains to support domestic and global demand.

Reshaping according to market dynamism corresponding to different applications

Compound semiconductors (SiC, GaN, GaAs, InP) keep expanding across power, RF, photonics, and displays, increasingly enabling system-level innovation beyond silicon.

The industry’s roadmap is defined by wafer scaling, capacity build-outs, and cost-reduction efforts across substrates and epitaxy.

SiC keeps scaling through 6-inch and accelerating 8-inch adoption, with new approaches targeting lower cost and better material efficiency.

GaN benefits from CMOS-compatible GaN-on-Si, pushing toward larger wafers to improve scalability and cost.

In RF and photonics, platform transitions remain gradual (GaAs staying standardized, InP moving toward 6-inch), while MicroLED momentum builds for later-decade ramp with substrate evolution as a key enabler.

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Status of the Compound Semiconductor Industry 2026 - Focus on Substrates and Epiwafers

AI Datacenters and EVs Fuel Growth: Compound Semiconductors Accelerate Wafer Scaling to $3B by 2031

Power SiC leads wafer economy, RF stabilizes, and photonics accelerates on AI datacom

Scaling Platforms and Applications Shape the Future of Compound Semiconductors

Reshaping according to market dynamism corresponding to different applications