SiC Substrate Cost Reduction Patent Landscape 2026
The SiC substrate cost-reduction space is a moderately concentrated field with 168 patent families in scope, led by Resonac Corp and a tight cluster of Japanese and U.S. incumbents. Filing activity reached a peak in 2023 and has plateaued since, signaling a maturing but still active competitive landscape.
Resonac leads a concentrated field of substrate and crystal-growth specialists
Resonac Corp holds the top position with 33 patent records, followed by Rohm Co. Ltd. at 24 and Thinsic Inc. at 22, establishing a clear three-player front tier in this cost-reduction space.
The top five filers collectively account for 34% of the hundred largest filers’ combined total, indicating meaningful concentration without outright dominance — challengers from both the device and materials sides remain competitive.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Resonac Corporation | 33 | |
| 2 | Rohm Co., Ltd. | 24 | |
| 3 | Thinsic Inc. | 22 | |
| 4 | II-VI Incorporated | 13 | |
| 5 | Mitsubishi Electric Corporation | 13 | |
| 6 | Resonac Holdings Corporation | 13 | |
| 7 | ZF Friedrichshafen AG | 12 | |
| 8 | Toyota Tsusho Corporation | 11 | |
| 9 | Massachusetts Institute of Technology | 10 | |
| 10 | Kwansei Gakuin University | 9 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Panasonic Holdings Corporation | 8 | |
| 12 | CUSIC Inc. | 8 | |
| 13 | Shin-Etsu Chemical Co., Ltd. | 8 | |
| 14 | Hitachi, Ltd. | 7 | |
| 15 | Zadient Technologies SAS | 7 | |
| 16 | Siltronic AG | 5 | |
| 17 | MinebeaMitsumi Power Semiconductor Device Inc. | 5 | |
| 18 | Renesas Electronics Corporation | 4 | |
| 19 | Michigan State University | 4 | |
| 20 | GlobalWafers Co., Ltd. | 4 |
The leaders’ positions reflect vertically integrated strategies: Resonac and Thinsic are weighted toward crystal growth and wafer processing, while Rohm’s portfolio spans device structures alongside substrate work, suggesting differentiated entry into cost levers.
Filings from 2024 onward are subject to standard publication lag and are likely under-counted; treat those years as indicative rather than conclusive. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Activity peaked in 2023; crystal growth and semiconductor device classes dominate the mix
The annual filing trend reveals a field that surged to a 2023 peak and has since plateaued, while the technology composition chart shows a dual-core structure split between semiconductor device processing and crystal growth methods.
Annual filing trend
Filings climbed from a 2017–2019 baseline, dipped in 2020 and 2022, then reached a clear peak of 33 records in 2023 before easing. The 2024 and 2025 bars are almost certainly under-counted due to publication lag and should not be read as a continuing decline.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01L (semiconductor devices) and C30B (crystal growth) together account for the largest share of the IPC distribution, confirming that cost-reduction efforts are split between wafer-growth process innovations and device-level integration. H10P, H10D, and C23C form a secondary tier, pointing to power-device performance and surface-deposition work as adjacent technical threads.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
Silicon carbide epitaxial wafer and silicon carbid…
A high quality silicon carbide epitaxial wafer using a p-type silicon carbide single crystal substrate of low resistivity. The silicon carbide epitaxial wafer includes a p-type 4H—SiC single crystal substrate that has a first main surface having an off angle with respect to (0001) plane, and has a resistivity of less than 0.4 Ωcm, and a silicon carbide… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Photovoltaic apparatus and mass-producing apparatu… | 106 |
| 2 | Sic epitaxial wafer and method for manufacturing s… | 89 |
| 3 | Large Diameter, High Quality SiC Single Crystals, … | 81 |
| 4 | Power module semiconductor device | 71 |
| 5 | Semiconductor wafer and method for fabricating the… | 53 |
| 6 | Systems and methods for graphene based layer trans… | 51 |
| 7 | Silicon carbide MOS semiconductor device | 43 |
| 8 | Silicon carbide epitaxial wafer and manufacturing … | 35 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
What the competitive structure means for R&D planning
Three structural signals — lifecycle stage, applicant concentration, co-development patterns, and geographic filing choices — shape where new investment is likely to find differentiated ground.
Field is at plateau maturity, with annual volume eased from its 2023 peak
The lifecycle evidence classifies this space as Maturity, with annual filings having plateaued near their 2023 peak. The multi-year recent growth of 7% indicates the field is still expanding on a portfolio basis, but the era of rapid annual volume increases has passed. New entrants face an increasingly codified prior-art landscape, making narrow claim differentiation critical.
Lifecycle: MaturityModerate top-tier concentration with room for specialist challengers
The top five filers hold 34% of the hundred largest filers’ combined total — significant but not monopolistic. Resonac’s 33-record lead over the field is the largest single-player gap, yet Rohm, Thinsic, and II-VI each hold defensible positions. Mid-tier players like ZF Friedrichshafen and Toyota Tsusho signal that automotive-supply-chain actors are actively building IP stakes alongside pure materials companies.
Concentration: ModerateToyota Tsusho–Denso–Toyo Tanso form the most active co-filing cluster
The strongest co-applicant pairs each share 6 joint filings: Toyota Tsusho with Denso, Toyota Tsusho with Toyo Tanso, and Denso with Toyo Tanso — forming a tightly coupled automotive-materials triad. Rohm co-files with MIT and the U.S. government (3 filings each), bridging industrial and academic research. Toyo Tanso also collaborates with Kwansei Gakuin University (4 filings), illustrating a university-industry pipeline for crystal growth process research.
Ecosystem: ClusteredU.S. filing dominance; Europe is the secondary validation market
The United States leads all jurisdictions by a wide margin at 167 patent records, with EPO at 61 serving as the primary secondary filing destination. PCT filings at 13 and China at 10 suggest selective international prosecution strategies rather than broad geographic coverage. South Korea, Japan, and China together total 21 records, pointing to under-filing in key SiC manufacturing geographies relative to the technology’s commercial importance there.
Geography: US-centricGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| Toyota Tsusho Corporation | Denso Corporation | 6 |
| Toyota Tsusho Corporation | Toyo Tanso Co., Ltd. | 6 |
| Toyo Tanso Co., Ltd. | Denso Corporation | 6 |
| Toyo Tanso Co., Ltd. | Kwansei Gakuin University | 4 |
| Resonac Holdings Corporation | Central Research Institute of Electric Power Industry | 3 |
| Resonac Holdings Corporation | Denso Corporation | 3 |
| Rohm Co., Ltd. | Massachusetts Institute of Technology | 3 |
| Rohm Co., Ltd. | The Government of the United States of America (as represented by the Secretary of Health and Human Services) | 3 |
| Toyota Tsusho Corporation | Kwansei Gakuin University | 3 |
| Massachusetts Institute of Technology | The Government of the United States of America (as represented by the Secretary of Health and Human Services) | 3 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Resonac anchors the field; Rohm and Thinsic are accelerating as new entrants
The top three players span crystal growth, wafer processing, and power-device integration, but differ materially in their trajectory — Resonac leads by volume while Rohm and Thinsic are logging strong recent momentum.
Resonac Corp
Resonac Corp holds 33 patent records, the largest position in the landscape, concentrated in H01L 21 semiconductor device processing and C30B 29 and C30B 25 crystal growth — covering both the growth and downstream wafer-processing cost levers. Its associated entity Resonac Holdings Corp accounts for an additional 13 records, indicating a coordinated group-level IP strategy. Applicant momentum data places Resonac Holdings among new-entrant-trajectory filers with 14 recent records, suggesting the group is actively refreshing its portfolio.
patent records: 33Rohm Co. Ltd.
Rohm Co. Ltd. holds 24 patent records and is flagged as a new-entrant trajectory with 10 recent records, indicating that its filing rate is accelerating from a low prior base. Its technology focus spans H01L 21, H01L 29, and H10P 14 — covering device structures alongside substrate work — and includes co-filings with MIT and the U.S. government, giving it an academic-research pipeline that complements its industrial volume. Thinsic Inc., also flagged as a new entrant with 16 recent records and 22 total, is the closest structural parallel and focuses heavily on H01L 21 and C30B crystal growth.
patent records: 24| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Rohm Co., Ltd. | 10 | ▲ new entrant |
| Thinsic Inc. | 16 | ▲ new entrant |
| Resonac Corporation | 14 | ▲ new entrant |
| Massachusetts Institute of Technology | 2 | ▲ new entrant |
Under-served branches at the intersection of deposition, power conversion, and inorganic chemistry
Several IPC branches appear at lower filing density relative to the dominant H01L and C30B core, identifying areas where the existing patent corpus is thinner and where technical complementarity to cost-reduction goals is plausible.
C23C · Coating & surface deposition
C23C holds 42 patent records and a relative share of 7% against the dominant IPC classes — meaningful activity but sparse compared to the semiconductor device core. Surface deposition techniques such as CVD and PVD are directly relevant to SiC epitaxial layer quality and thickness control, both of which are cost drivers. An entrant with process chemistry expertise in deposition optimization could find differentiated ground here without directly competing with Resonac’s crystal-growth-heavy portfolio.
Search this in Eureka →H02M · Power conversion (AC/DC etc.)
H02M appears at only 9 patent records and a 2% share, indicating that the system-level power conversion perspective on SiC substrate cost is largely unclaimed. As SiC power modules move into automotive and grid applications, IP linking substrate quality and cost trade-offs to converter efficiency and reliability at the module level is sparse. This branch is plausible for players — such as ZF Friedrichshafen or automotive tier-1 suppliers — who can bridge substrate materials work with power electronics system integration.
Search this in Eureka →How leaders differ across crystal growth, device processing, and power conversion routes
Route coverage across the main technology branches in the current evidence set.
| Player | H01L 21 · Semiconductor devices | H01L 29 · Semiconductor devices | C30B 29 · Crystal growth | C30B 25 · Crystal growth | H10P 14 |
|---|---|---|---|---|---|
| Resonac Holdings Corporation | Strong · 27 | Moderate · 10 | Strong · 20 | Strong · 15 | Emerging · 4 |
| Rohm Co., Ltd. | Strong · 22 | Strong · 19 | Moderate · 10 | Moderate · 11 | Strong · 13 |
| Thinsic Inc. | Strong · 15 | Moderate · 7 | Strong · 9 | Strong · 9 | Absent |
| ZF Friedrichshafen AG | Strong · 12 | Strong · 10 | Absent | Absent | Strong · 11 |
| II-VI Incorporated | Absent | Absent | Strong · 17 | Strong · 9 | Moderate · 7 |
| Shin-Etsu Chemical Co., Ltd. | Strong · 8 | Moderate · 4 | Strong · 6 | Moderate · 4 | Strong · 7 |
Frequently asked questions
The landscape covers 168 patent families in scope. The leading applicant, Resonac Corp, holds 33 patent records, and the top five filers account for 34% of the hundred largest filers’ combined total.
Resonac Corp leads with 33 patent records, focused on H01L semiconductor device processing and C30B crystal growth. Rohm Co. Ltd. ranks second at 24 records and Thinsic Inc. third at 22 records.
The field is classified as Maturity. Annual filings have plateaued near their 2023 peak of 33 records. The recent multi-year window still shows positive growth of 7%, but the era of rapid annual volume increases has passed.
The United States leads with 167 patent records, followed by Europe (EPO) at 61 and WIPO PCT at 13. China and Japan each record 10, suggesting relatively limited prosecution in key Asian SiC manufacturing markets.
H01L (semiconductor devices) and C30B (crystal growth) form the core of the technology mix. Secondary branches include H10P, H10D (semiconductor devices general), and C23C (coating and surface deposition), reflecting activity across both the growth process and device integration dimensions of cost reduction.
The most active co-filing clusters center on Toyota Tsusho, Denso, and Toyo Tanso — each pair sharing 6 joint filings — forming an automotive-materials triad. Rohm co-files with MIT and the U.S. government (3 filings each), and Toyo Tanso collaborates with Kwansei Gakuin University on 4 filings.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
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