Cadmium Telluride Solar Cell Patent Landscape 2026
Cadmium Telluride Solar Cell Patent Landscape in 2026
The cadmium telluride (CdTe) solar cell patent field is moderately concentrated, with First Solar and Nitto Denko holding commanding positions among the top hundred filers. Activity peaked in 2018 and has since declined materially, placing the field in a late-stage, past-peak phase where incumbents dominate and entry barriers are high.
First Solar leads a moderately concentrated field with Chinese challengers closing fast
First Solar holds the top position among the hundred largest filers, followed closely by Nitto Denko and. China Triumph International Engineering. The top five filers together account for 24% of the combined output of the hundred largest filers, signalling moderate concentration with meaningful secondary-tier competition.
A visible tier gap separates the top three — First Solar, Nitto Denko, and. China Triumph — from the mid-table pack. Chinese players (China Triumph, CNBM Chengdu Optoelectronics) have built substantial positions that rival the Western incumbents, compressing what was once a clear First Solar advantage.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | First Solar Inc | 54 | |
| 2 | Nitto Denko Corporation | 50 | |
| 3 | China Triumph International Engineering Co., Ltd. | 38 | |
| 4 | First Solar Malaysia | 28 | |
| 5 | CNBM Chengdu Optoelectronics Material Co., Ltd. | 27 | |
| 6 | Maxeon Solar Pte. Ltd. | 27 | |
| 7 | CTF Solar GmbH | 22 | |
| 8 | Uriel Solar Inc. | 21 | |
| 9 | Guardian Industries Corp. | 19 | |
| 10 | Panasonic Holdings Corporation | 17 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | SoloPower | 16 | |
| 12 | SOLAR SYST & EQUIP | 16 | |
| 13 | Evergreen Solar Inc. | 15 | |
| 14 | Auria Solar Co., Ltd. | 15 | |
| 15 | Sichuan University | 15 | |
| 16 | Choshu Industry Co., Ltd. | 14 | |
| 17 | Solexant Corp. | 14 | |
| 18 | Antec Solar Energy AG | 13 | |
| 19 | Mitsubishi Chemical Corporation | 13 | |
| 20 | Taka Solar Corp. | 12 |
First Solar’s position reflects deep investment in semiconductor device architecture and system-level photovoltaic integration, while Nitto Denko’s count reflects diversification into encapsulant and organic-semiconductor adjacent areas. Challengers from the CNBM ecosystem focus heavily on deposition and manufacturing process patents, suggesting a strategic emphasis on cost-competitive production technology.
The most recent 18–24 months of filing data are subject to publication lag and likely undercount activity; apparent low volumes in 2024–2025 should not be read as confirmed absence of new filings. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Activity peaked in 2018 and has retreated; semiconductor device claims dominate the technology mix
The annual filing trend and technology composition together reveal a maturing field where the primary device-architecture questions have been extensively addressed and activity has contracted from peak levels. Adjacent areas such as coating processes and system integration remain comparatively underworked.
Annual filing trend
Filings reached their highest annual level in 2018 and have trended lower since, consistent with a field that has passed its growth peak. Volumes in 2024–2025 reflect publication lag and should be treated as preliminary; the apparent near-zero reading for 2026 is an artifact of the data cutoff, not a confirmed halt in activity.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01L (semiconductor devices) overwhelmingly dominates the technology mix, reflecting that CdTe research has centered on junction engineering, absorber layer design, and cell architecture. H02S (photovoltaic system integration) and C23C (coating and surface deposition) are the next most active branches, pointing to secondary interest in manufacturing processes and module-level design.
↗ 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.
Cadmium telluride solar cell and preparation metho…
A cadmium telluride solar cell and a preparation method thereof. The method includes providing a substrate, and forming a window layer on a first surface of the substrate, the window layer is made of magnesium-doped zinc oxide; forming a light absorbing layer on a surface of the window layer, the light absorbing layer includes a composite layer of cadmium… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Encapsulant material for solar cell module and lam… | 283 |
| 2 | Process for fabricating polycrystalline semiconduc… | 241 |
| 3 | Apparatus and processes for the massproduction of … | 237 |
| 4 | Apparatus and processes for the mass production of… | 219 |
| 5 | Methods of interconnecting thin film solar cells | 203 |
| 6 | Encapsulant material for solar cell module and lam… | 172 |
| 7 | Thin film photovoltaic module manufacturing method… | 164 |
| 8 | Method of forming semiconductor thin film and meth… | 162 |
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 patent structure means for CdTe R&D investment decisions
The combination of declining annual volume, strong incumbent positioning, and a narrow dominant technology class creates a specific set of conditions for new entrants and existing players evaluating R&D allocation. Four structural factors are most relevant.
Field in decline from a 2018 peak
The lifecycle stage is classified as Decline, with annual filings easing back from the 2018 peak. The multi-year window still reflects accumulated activity from the growth era, but new filing momentum has receded sharply. For an R&D team, this signals that foundational device-architecture space is heavily occupied and incremental improvement patents face a crowded prior-art landscape.
Past-peak · DeclineModerate concentration with a compressed leader gap
The top five filers hold 24% of the combined output of the hundred largest filers — moderate rather than extreme concentration. However, the gap between First Solar (54 patent records) and Nitto Denko (50 patent records) is narrow, and Chinese CNBM-affiliated entities collectively represent a substantial bloc. New entrants face an established prior-art wall in core CdTe device classes but may find differentiation in process or system integration routes.
Moderate concentrationCNBM ecosystem leads co-filing; First Solar has limited open collaboration
The most active co-filing pair is China Triumph International Engineering with CTF Solar GmbH, sharing 22 co-filed records — the dominant collaboration relationship in the dataset. Saint-Augustin Canada Electric and Maxeon Solar also appear as a co-filing pair with 4 shared records. First Solar’s collaboration with the Alliance for Sustainable Energy is documented with 2 shared records. Co-filing activity is concentrated within vertically integrated corporate ecosystems rather than cross-industry partnerships.
Ecosystem-driven co-filingUS leads filings; Europe, China, and PCT coverage are substantial
The United States is the primary filing jurisdiction by a wide margin. Europe (EPO) and China are the next most active destinations, followed by WIPO (PCT) filings that indicate intent for broad international protection. Australia, Japan, and South Korea round out the secondary jurisdictions. The geographic spread confirms that leading filers are pursuing multi-market protection, raising the cost of freedom-to-operate in this space.
US-led · multi-marketGo 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 |
|---|---|---|
| China Triumph International Engineering Co., Ltd. | CTF Solar GmbH | 22 |
| Saint-Augustin Canada Electric Inc. | Maxeon Solar Pte. Ltd. | 4 |
| First Solar Inc | Alliance for Sustainable Energy, LLC | 2 |
| China Triumph International Engineering Co., Ltd. | CNBM Research Institute for Advanced Glass Materials Group Co., Ltd. | 1 |
| CNBM Chengdu Optoelectronics Material Co., Ltd. | Ruichang CNBM Optoelectronics Material Co., Ltd. | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
First Solar and Nitto Denko lead; Chinese CNBM affiliates form a third force
The top of the ranking is split between a US incumbent with deep device-architecture IP, a Japanese diversified materials player, and a set of Chinese state-affiliated manufacturers focused on deposition and manufacturing process claims. Momentum signals from the most recent filing window show the overall field contracting sharply.
First Solar Inc
First Solar holds 54 patent records among the top ranked filers, the highest count in the corpus. Its technology focus is concentrated in H01L 31 (semiconductor devices, 33 records), followed by H02S 30 (photovoltaic system integration, 13 records), reflecting a strategy covering both cell-level and system-level IP. Recent filing momentum shows only 2 records in the most recent window, flagged as a new-entrant signal in the current period — though publication lag limits conclusions about current activity.
patent records: 54Nitto Denko Corporation
Nitto Denko holds 50 patent records, ranking second overall. Its technology portfolio is notably more diversified than First Solar’s: H01L 31 (semiconductor devices, 60 records at the subclass level) is complemented by C09K 11 (materials for miscellaneous applications, 34 records) and H10K 99 (organic semiconductors, 19 records), indicating broader materials-science coverage that extends beyond pure CdTe device architecture. This diversification may reflect encapsulant and functional-film interests adjacent to the core cell.
patent records: 50| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| First Solar Inc | 2 | ▲ new entrant |
| China Triumph International Engineering Co., Ltd. | 1 | ▼ -96% |
| CNBM Chengdu Optoelectronics Material Co., Ltd. | 1 | ▼ -90% |
Under-served adjacent branches worth monitoring in the CdTe space
While H01L dominates the technology mix, several adjacent IPC branches carry meaningful counts relative to the dominant class, suggesting areas where patent density is lower and differentiated filings may face less prior-art crowding. These are observations of relative sparsity and should be evaluated against technical feasibility and commercial relevance before treating them as investment targets.
C23C · Coating & surface deposition
With 74 patent records, C23C represents the primary deposition-process branch in the corpus — but its share remains at 4% relative to H01L. For CdTe cells, deposition method (close-space sublimation, sputtering, vapor transport) is a key manufacturing differentiator. This branch is under-served relative to the device-level claims, and entrants with novel deposition or surface-treatment approaches may find less-crowded prior art here. The realistic entry path involves process patents on precursor materials, deposition conditions, or novel substrate treatments.
Search this in Eureka →B32B · Layered products & laminates
B32B holds 36 patent records at a 2% share, covering layered product architectures relevant to module encapsulation, back-contact structures, and barrier films in CdTe panels. This branch sits at the intersection of materials science and module reliability — an area of growing commercial importance as field-deployed CdTe modules age. Plausible entry paths include novel laminate constructions for improved moisture resistance or mechanical durability, where the patent density is noticeably lower than in the device-physics core.
Search this in Eureka →How leading filers differ by technology route
Strength of each leader across the main technology routes.
| Player | H01L 31 · Semiconductor devices | H01L 21 · Semiconductor devices | C23C 14 · Coating & surface deposition | H10K 99 · Organic semiconductors (OLED etc.) | H01L 27 · Semiconductor devices |
|---|---|---|---|---|---|
| Nitto Denko Corporation | Strong · 60 | Absent | Absent | Moderate · 19 | Absent |
| China Triumph International Engineering Co., Ltd. | Strong · 38 | Absent | Emerging · 5 | Absent | Absent |
| General Electric Company | Strong · 32 | Absent | Emerging · 4 | Absent | Emerging · 3 |
| First Solar Inc | Strong · 33 | Absent | Absent | Absent | Absent |
| CNBM Chengdu Optoelectronics Material Co., Ltd. | Strong · 25 | Absent | Emerging · 3 | Absent | Absent |
| CTF Solar GmbH | Strong · 22 | Absent | Moderate · 5 | Absent | Absent |
| Saint-Augustin Canada Electric Inc. | Strong · 24 | Absent | Absent | Absent | Absent |
Frequently asked questions
The corpus contains 262 patent families in scope. The United States is the leading filing jurisdiction by a substantial margin.
First Solar holds the highest count among the top hundred filers with 54 patent records, followed by Nitto Denko with 50 and China Triumph International Engineering with 38 patent records.
No. The field is classified as Decline, with annual filings easing back from a peak in 2018. The most recent years (2024–2025) should be treated as preliminary due to publication lag, but the multi-year trend is clearly downward from the 2018 high.
H01L (semiconductor devices) is overwhelmingly dominant. Secondary branches include H02S (photovoltaic system integration), C23C (coating and surface deposition), H10K (organic semiconductors), and C09K (materials for miscellaneous applications).
The United States leads all jurisdictions. Europe (EPO) and China are the next most active destinations, followed by WIPO (PCT) filings, and then Australia, Japan, and South Korea as secondary markets.
China Triumph International Engineering and CTF Solar GmbH form the most active co-filing pair with 22 jointly filed records. Saint-Augustin Canada Electric and Maxeon Solar are the next most active pair with 4 shared records. First Solar has co-filed with the Alliance for Sustainable Energy on 2 records.
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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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