Wolfspeed brings transparent silicon carbide to market, naming quantum computing as a target

Wolfspeed, the NYSE-listed silicon carbide (SiC) manufacturer best known for power semiconductors and SiC wafers, announced on October 29 the commercial introduction of what it calls transparent silicon carbide, or TSiC. The company is positioning the optical-grade substrates for augmented reality (AR) eyewear first, but its press release names quantum computing as a second major market, a sign that large materials suppliers see the quantum hardware stack as a customer base worth courting.

What was announced

According to Wolfspeed, TSiC substrates are engineered for very low optical absorption and tight wafer flatness. The company ties the launch to its long history in the material, including its early LED work and its production of high-purity semi-insulating (HPSI) wafers. Wolfspeed says it continues to advance 200 mm optical-grade substrates while developing 300 mm TSiC technology for future demand, and it is taking requests for samples.

Katrin Feurle, Vice President, Beyond Power at Wolfspeed, framed the product as part of an effort to take the company's silicon carbide intellectual property beyond its traditional power semiconductor business and into AR, quantum computing and other emerging markets.

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The technical details

Wolfspeed's TSiC product page lists the substrates as commercially available in 150 mm and 200 mm diameters, with 300 mm in sampling or on request. The wafers use the 4H crystal structure, are on-axis and double-side polished, and are 500 µm thick (±20 µm). Target specifications include an absorption coefficient of at most 0.05 cm⁻¹ between 450 and 650 nm, total thickness variation of at most 1.5 µm and optical roughness of 1 nm or less on both sides. The page also says the reduced-absorption technique received a U.S. patent in July 2024.

For quantum applications, the company describes three roles for 4H-SiC: as a cryogenic packaging substrate, as a low-loss photonic platform, and as a host for engineered spin-defect qubits. The press release goes further, saying a single silicon carbide crystal can host qubits, preserve their quantum states and carry quantum information through light, and claiming that many alternative materials cannot combine all of these functions.

Why it matters

Spin defects in solid-state crystals are one of several approaches to qubits and quantum sensors, and they are attractive because the same chip can, in principle, hold the qubit and the optical interface used to network it. Material purity and optical loss are central to that idea, which is why a supplier with established wafer production entering the space is worth noting. For now, Wolfspeed frames quantum computing as a potential use, so independent device results on TSiC wafers will matter more than the launch itself.

The AR case is more developed in the release. Wolfspeed points to silicon carbide's high refractive index, low birefringence, hardness and thermal conductivity as reasons it suits AR waveguides, and quotes Barry Silverstein of the University of Rochester, a former Meta Reality Labs optics executive, on how a high-index material could let a single waveguide layer replace stacked optics.

What to watch

The key questions are whether quantum hardware groups adopt the substrates for photonic circuits, packaging or spin-qubit work, and how quickly the 300 mm version moves from sampling to volume. Any published qubit or photonic loss results on TSiC wafers would be the clearest signal of traction in quantum.