Thin-Film Solar Cell Patent Landscape 2026
Thin-Film Solar Cell Patent Landscape in 2026
Kaneka Corporation leads a moderately concentrated field of 3,376 patent families, with Japanese and Korean industrial incumbents holding the top positions. The field is in a decline stage with annual filing volume easing markedly from its 2018 peak, signaling a maturing technology where white space is found in adjacent coating, laminate, and organic-semiconductor branches rather than core device claims.
Kaneka and Sharp anchor a moderately concentrated leader tier
Kaneka Corporation ranks first among the hundred largest filers, followed by Sharp Corporation and LG Electronics. The top five filers together account for roughly 20% of the combined patent records of the hundred largest filers, indicating moderate rather than extreme concentration.
A clear tier gap exists between the top two applicants — Kaneka and Sharp — and the rest of the field. LG Electronics, Fuji Electric, and Applied Materials form a second tier at roughly half the record count of the leader, while the remainder of the top twenty are closely bunched, suggesting no single challenger is positioned to close the gap quickly.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Kaneka Corporation | 583 | |
| 2 | Sharp Corporation | 512 | |
| 3 | LG Electronics Inc. | 353 | |
| 4 | Fuji Electric Co., Ltd. | 271 | |
| 5 | Applied Materials Inc. | 256 | |
| 6 | Canon Inc. | 251 | |
| 7 | Panasonic Holdings Corporation | 211 | |
| 8 | Solar Frontier K.K. | 202 | |
| 9 | EI DU PONT DE NEMOURS & CO | 170 | |
| 10 | Industrial Technology Research Institute (ITRI) | 170 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | CNBM Research Institute for Advanced Glass Materials | 170 | |
| 12 | Mitsubishi Electric Corporation | 164 | |
| 13 | IBM Corporation | 161 | |
| 14 | Tesla Inc. | 150 | |
| 15 | Nexpower Technology Corp. | 147 | |
| 16 | Kyocera Corporation | 143 | |
| 17 | Korea Institute of Energy Research | 141 | |
| 18 | Samsung SDI Co., Ltd. | 141 | |
| 19 | SoloPower Inc. | 140 | |
| 20 | Solarlytics Inc. | 139 |
The incumbents’ deep H01L 31 semiconductor-device portfolios reflect decades of core device investment. This creates high freedom-to-operate barriers in mainstream cell architectures, but leaves adjacent technology classes such as deposition chemistry and module integration comparatively open.
Filing counts for 2024 and 2025 are subject to publication lag and understate true recent activity; the apparent sharp drop in those years should not be read as a steeper decline than the underlying trend suggests. 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 eased; semiconductor device claims dominate the technology mix
Two charts together tell the story of a field that built its foundational IP base through the mid-2010s and has since entered a decline phase, while the technology composition reveals both the concentration around core device classes and the breadth of adjacent branches.
Annual filing trend
Filings rose to a peak in 2018 and have declined in every subsequent year tracked. The recent-window growth rate is -29%, confirming a genuine multi-year contraction rather than a temporary fluctuation. Counts for 2024–2026 are materially under-counted due to publication lag and should be treated as lower bounds.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01L semiconductor device classes are overwhelmingly dominant, reflecting core thin-film cell and process IP. H02S photovoltaic systems, C23C coating and deposition, and H10K organic semiconductors are the next-largest branches, each representing a secondary technology layer. Smaller branches spanning glass composition, polymer lamination, and building integration indicate that application-side innovation is spread across many adjacent classes.
↗ 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.
Thin film solar cell and manufacturing method ther…
The present invention relates to a thin film solar cell and manufacturing method thereof. The thin film solar cell comprises a substrate, a front electrode layer, an absorber layer and a rear electrode layer stacked in such sequence, wherein the front electrode layer is formed by doping group III element into a zinc oxide. The thin-film solar cell further… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Optoelectronic device | 513 |
| 2 | Photovoltaic module framing system with integral e… | 491 |
| 3 | Process for producing semiconductor article | 490 |
| 4 | Manufacturing apparatus and method for large-scale… | 454 |
| 5 | Process for producing semiconductor article | 435 |
| 6 | Solar cell module panel | 418 |
| 7 | Photoactive devices and materials | 411 |
| 8 | Solar cell module | 398 |
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 investment decisions
The combination of a decline life-cycle stage, moderate top-tier concentration, active co-filing networks among incumbents, and broad geographic filing coverage shapes where new entrants can realistically find room to build differentiated positions.
Field is in decline — foundational claims are largely staked
The life-cycle stage is classified as Decline, with annual filings easing from the 2018 peak. Core device and process claims in H01L 31 are densely covered by incumbents. New entrants face high prior-art density in mainstream amorphous-silicon and CIGS architectures, making incremental device improvements a difficult R&D target without a freedom-to-operate analysis. Adjacent application spaces — building integration, lightweight substrates, and tandem configurations — carry lower prior-art density.
Decline stageModerate concentration with a two-player lead tier
Kaneka and Sharp hold a combined record count well above any other pair in the top twenty, forming a distinct first tier. The top five filers account for 20% of the hundred largest filers’ combined total — moderate by technology-landscape standards. This means challengers in the second and third tiers have meaningful room to grow relative share through focused portfolio strategy in under-covered branches, without needing to outspend the leaders on core device IP.
Moderate concentrationCo-filing is concentrated among Japanese incumbents and their research partners
The most active co-filing pair is Fuji Electric and its research subsidiary, with 17 jointly filed records. Sharp has the most diverse collaboration network, co-filing with the National Institute of Advanced Industrial Science and Technology (16 records), as well as with individual inventors Michio Kondo (11 records) and Akihisa Matsuda (11 records). Kaneka co-filed with Nippon Sheet Glass (10 records). IBM co-filed with Solar Frontier and the Nanotechnology Center of Egypt. This pattern suggests that the dominant collaboration model is a large Japanese industrial firm paired with a captive research partner or national institute, with limited evidence of broad cross-regional consortia.
Incumbent-led co-filingUS and China are the primary filing destinations; Japan and Korea are also material
The United States is the leading jurisdiction by patent record count, followed by China, the European Patent Office, and Japan. South Korea and WIPO PCT filings are also significant. Taiwan appears as a distinct jurisdiction, reflecting local thin-film producers. This distribution shows that any commercially meaningful portfolio in this field requires at minimum US, China, EPO, and Japan coverage. Emerging solar markets such as India and Australia show smaller but non-trivial filing volumes, indicating that some filers are already building coverage in growth-deployment regions.
US-led, global reachGo 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 |
|---|---|---|
| Fuji Electric Co., Ltd. | Fuji Electric Advanced Technology Co., Ltd. | 17 |
| Sharp Corporation | National Institute of Advanced Industrial Science and Technology (AIST) | 16 |
| Sharp Corporation | Michio Kondo | 11 |
| Sharp Corporation | Akihisa Matsuda | 11 |
| Kaneka Corporation | Nippon Sheet Glass Co., Ltd. | 10 |
| Sharp Corporation | Toyobo Co., Ltd. | 10 |
| Kaneka Corporation | Yoshihiro Hamakawa | 7 |
| IBM Corporation | Solar Frontier K.K. | 6 |
| IBM Corporation | Nanotechnology Center of Egypt | 5 |
| IBM Corporation | IBM UNITED KINGDOM LTD INTELLECTUAL PROPERTY DEPAR… | 5 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Kaneka and Applied Materials: contrasting trajectories at the top
The leader and a notable challenger illustrate two very different portfolio trajectories within the same declining field — one legacy incumbent with a contracting filing rate, and one equipment supplier re-entering with fresh activity.
Kaneka Corporation
Kaneka Corporation leads the corpus with 583 patent records, concentrated almost entirely in H01L 31 semiconductor device claims (540 records), with secondary positions in H01L 21 process and H01L 27 integrated circuits. This deep, device-centric portfolio reflects decades of amorphous and heterojunction thin-film investment. However, Kaneka’s recent filing momentum shows a -62% decline versus the prior three-year period, consistent with the field’s broader decline stage and suggesting the company is no longer aggressively expanding its thin-film patent position.
583 patent recordsApplied Materials Inc.
Applied Materials ranks fifth with 256 patent records, focused on H01L 31 semiconductor devices (249 records), H01L 21 process technology (71 records), and C23C 16 coating and deposition (17 records). Unlike the Japanese incumbents, Applied Materials is classified as a new entrant in the most recent filing window, with only 2 recent records — indicating that its ranking reflects a historical portfolio rather than active expansion. Its deposition-process emphasis (C23C) differentiates it from the pure device-IP holders and could be strategically relevant as thin-film manufacturing equipment remains in demand regardless of cell-type shifts.
256 patent records| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Kaneka Corporation | 5 | ▼ -62% |
| Applied Materials Inc. | 2 | ▲ new entrant |
Under-served routes in coatings, laminates, and organic semiconductors
Several IPC branches appear alongside the dominant H01L device class but at substantially lower relative share, representing areas where thin-film solar IP is sparse relative to the technical relevance of those branches to next-generation module design.
C23C · Coating and surface deposition
With 1,430 patent records against the much larger H01L device corpus, C23C coating and deposition is the third-largest branch but remains under-represented relative to its technical centrality. Deposition process innovation — including atomic layer deposition and sputtering for transparent conductive oxides and absorber layers — is fundamental to cell efficiency and manufacturing yield. Equipment suppliers and specialty chemical firms may find differentiated entry paths here, particularly for novel absorber materials or low-temperature deposition routes suited to flexible substrates.
Search this in Eureka →H10K · Organic semiconductors
H10K organic semiconductor claims number 803 patent records in this corpus — roughly one-fifth the scale of the H01L core. Perovskite-organic and all-organic thin-film photovoltaics are technically adjacent and represent an active research frontier where the prior-art landscape is less entrenched than in silicon-based thin films. The comparatively lower record count suggests room for early-mover portfolio building by academic spinouts or specialty materials firms, though commercial readiness and stability challenges remain open questions that a freedom-to-operate review would need to assess.
Search this in Eureka →How leaders differ by technology route emphasis
Strength of each leader across the main technology routes.
| Player | H01L 31 · Semiconductor devices | H01L 21 · Semiconductor devices | C23C 14 · Coating & surface deposition | H01L 27 · Semiconductor devices | H02S 40 · Photovoltaic / solar power generation |
|---|---|---|---|---|---|
| Kaneka Corporation | Strong · 540 | Emerging · 85 | Absent | Emerging · 68 | Absent |
| Sharp Corporation | Strong · 474 | Emerging · 51 | Absent | Emerging · 32 | Absent |
| LG Electronics Inc. | Strong · 346 | Absent | Absent | Emerging · 21 | Emerging · 46 |
| Canon Inc. | Strong · 244 | Moderate · 74 | Absent | Emerging · 18 | Absent |
| Applied Materials Inc. | Strong · 249 | Moderate · 71 | Absent | Absent | Absent |
| Showa Shell Sekiyu K.K. | Strong · 265 | Emerging · 31 | Emerging · 23 | Absent | Absent |
| Fuji Electric Co., Ltd. | Strong · 254 | Absent | Absent | Emerging · 28 | Absent |
Frequently asked questions
Kaneka Corporation leads with 583 patent records among the top hundred filers, followed by Sharp Corporation with 512 and LG Electronics with 353. These three Japanese and Korean industrial incumbents form the top tier of the field.
No. The field is classified as Decline, with annual filing volume easing from a 2018 peak. The recent-window growth rate is -29%. Filing counts for 2024 and 2025 are subject to publication lag and are under-counted, but the multi-year contraction is confirmed by the trend from 2018 onward.
The United States is the leading jurisdiction by patent record count, followed by China, the European Patent Office, Japan, and South Korea. WIPO PCT and Taiwan also carry significant filing volumes. Any commercially meaningful portfolio requires coverage across at least the US, China, EPO, and Japan.
H01L semiconductor device classes are overwhelmingly dominant, reflecting core cell and process IP. The next-largest branches are H02S photovoltaic systems, C23C coating and surface deposition, and H10K organic semiconductors. A wide range of further adjacent classes — spanning glass, polymers, laminates, and building integration — each account for smaller shares.
The most active co-filing pair by record count is Fuji Electric and its research subsidiary with 17 jointly filed records. Sharp has the broadest collaboration network, co-filing with Japan’s National Institute of Advanced Industrial Science and Technology (16 records), inventor Michio Kondo (11 records), inventor Akihisa Matsuda (11 records), and Toyobo (10 records). Kaneka co-filed with Nippon Sheet Glass (10 records).
The C23C coating and deposition branch and the H10K organic semiconductor branch show notably lower patent-record density relative to their technical relevance. B32B layered products and laminates and C03C glass compositions are additional adjacent branches with comparatively sparse coverage. These observations do not confirm commercial opportunity on their own; a freedom-to-operate and prior-art review is necessary before drawing investment conclusions.
Ready to map your own thin-film solar patent landscape?
Join 18,000+ innovators using PatSnap Eureka to map any technology landscape: search 2B+ patents and papers, surface key assignees, and generate a report like this in minutes.
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.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. PatSnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.