Perovskite Bifacial Cell Patent Landscape 2026
The perovskite bifacial cell patent field is in a Growth stage, with the field expanding strongly on a multi-year basis even as annual volume has eased from its 2023 peak; the corpus is spread across a diverse mix of universities, energy companies, and startups with no single dominant incumbent. China leads in filing office coverage, while William Marsh Rice University holds the largest individual position among the top ranked filers.
A fragmented, university-led field with no dominant incumbent
William Marsh Rice University leads the applicant ranking, followed closely by Energy Materials Corp, BRITE HELLAS SA, and LG Electronics—each separated by only one or two patent records. This compressed ranking signals that no single entity has established a commanding position.
The top five filers account for 30% of the hundred largest filers’ combined total, indicating a moderately fragmented competitive structure. There is no pronounced tier gap between the leader and its nearest challengers, which means the leadership order could shift quickly as newer entrants scale their filings.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | William Marsh Rice University | 6 | |
| 2 | Energy Materials Corp | 5 | |
| 3 | BRITE HELLAS SA | 4 | |
| 4 | LG Electronics Inc. | 4 | |
| 5 | China Huadian Engineering Co., Ltd. | 3 | |
| 6 | Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences | 3 | |
| 7 | Huadian Zhongguang New Energy Technology Co., Ltd. | 3 | |
| 8 | UNIST (ULSAN NAT INST OF SCI & TECH) | 2 | |
| 9 | Wuxi Utmost Light Technology Co., Ltd. | 2 | |
| 10 | Nanjing Tech University | 2 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Aalto University Foundation | 2 | |
| 12 | Huaneng Clean Energy Research Institute | 2 | |
| 13 | King Fahd University of Petroleum and Minerals | 2 | |
| 14 | The University of North Carolina at Chapel Hill | 2 | |
| 15 | The Arizona Board of Regents on behalf of the University of Arizona | 2 | |
| 16 | Dr. Santosh Kumar Nathsharma | 1 | |
| 17 | Zunyi Normal College | 1 | |
| 18 | Huacai Guangneng Technology (Yunnan) Co., Ltd. | 1 | |
| 19 | CHINA CONSTR SCI & IND CORP LTD | 1 | |
| 20 | SHAANXI UNIV OF SCI & TECH | 1 |
The presence of Rice University and several other academic institutions at the top of the ranking suggests the field remains partly in a research-output phase, with commercial players such as LG Electronics and Energy Materials Corp beginning to establish intellectual property positions alongside academia.
Filing counts for 2025 and 2026 are understated due to standard patent publication lag; the apparent plateau in those years should not be read as a slowdown. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Rapid multi-year growth anchored in organic-semiconductor device art
Annual filing activity and the IPC class breakdown together reveal both the pace of development and the dominant technical approaches being protected in this space.
Annual filing trend
Activity was negligible before 2022, then accelerated sharply through 2023—the peak year—before easing in 2024 and 2025. The recent-window growth figure reflects the scale of expansion from the earlier period. Counts for 2025 and 2026 remain understated due to publication lag and should not be interpreted as a real decline.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H10K (organic semiconductors) dominates the IPC class distribution by a wide margin, reflecting the classification of perovskite absorber and charge-transport layers under that branch. H01L (semiconductor devices) and H01G (capacitors, including dye-sensitized and related cell structures) are secondary branches. Dedicated photovoltaic branches H10F and H02S are comparatively sparse, pointing to a potential classification gap and an under-served area for device-level and system-level claims.
↗ 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.
Perovskite solar cell
The invention relates to a perovskite solar cell. The perovskite solar cell is either a single solar cell or at least one sub-cell of a multi-junction solar cell. The perovskite solar cell has: an absorber made of a perovskite material, an electron transport layer which is conductively connected to at least one negative contact of the perovskite solar cell… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Tandem solar cell, tandem solar cell module compri… | 55 |
| 2 | A double sided solar cell assembly | 8 |
| 3 | Tandem solar cell and tandem solar cell module com… | 7 |
| 4 | Tandem solar cell and tandem solar cell module com… | 5 |
| 5 | 一种协同改善缺陷及离子迁移的高效、空气湿度稳定钙钛矿太阳能电池 | 3 |
| 6 | 一种双面柔性太阳能电池及其制备方法 | 2 |
| 7 | Solution-processed perovskite heterostructures | 2 |
| 8 | 一种双面钙钛矿光伏组件冷却系统及方法 | 1 |
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 R&D investment decisions
Four structural observations—maturity, concentration, collaboration, and geography—shape where differentiation is still achievable and where the barriers are beginning to solidify.
Growth stage: multi-year expansion with annual volume easing from 2023 peak
The field is classified as Growth: the recent three-year filing window sits well above the prior three-year window, confirming that the technology is still attracting new IP investment on a multi-year basis. Annual volume has eased from the 2023 peak, which is consistent with normal publication-lag effects in a field this young. Entrants arriving now can still stake out claims in underexplored sub-domains before the space matures further.
Growth stageFragmented top tier; leadership could shift within one filing cycle
The top five filers hold 30% of the hundred largest filers’ combined total, and the gaps between ranked positions one through five are narrow. This low concentration means no single player controls a blocking portfolio. For an R&D team, it implies that a focused filing campaign of even modest scale could move an organization into the top tier relatively quickly.
Low concentrationOne documented co-filing partnership, both within China Huadian group
The only confirmed co-applicant relationship in the corpus is between Huadian Zhongguang New Energy Technology and China Huadian Engineering—both entities within the same state-owned energy group—with three joint filings. No cross-institutional or cross-border co-filing clusters are evident from current evidence, suggesting that collaborative IP strategies remain limited and that partnership-based filing could be a differentiating approach for new entrants.
Thin ecosystemChina is the primary filing office; US and EPO are secondary targets
China accounts for the largest share of patent records by filing office, followed by the United States, Europe (EPO), India, and WIPO PCT routes. South Korea, Canada, and Malaysia also appear but with very low counts. This distribution suggests that Chinese-origin applicants are defending domestic positions, while US universities and commercial players are seeking protection primarily in the US and increasingly via PCT for broader coverage. Jurisdictions such as India and Southeast Asia may be strategically underweighted relative to their solar deployment potential.
China-ledGo 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 |
|---|---|---|
| Huadian Zhongguang New Energy Technology Co., Ltd. | China Huadian Engineering Co., Ltd. | 3 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Rice University and Energy Materials Corp lead; LG Electronics is the commercial anchor
The top of the ranking combines US academic research output, a dedicated energy-materials startup, a European PV specialist, and a major Korean electronics firm—each with a distinct technical emphasis.
William Marsh Rice University
Rice University leads the ranking with 6 patent records, concentrated entirely in H10K organic-semiconductor subclasses (device architecture H10K30 and materials H10K85), consistent with its strong perovskite photovoltaics research program. Its momentum is classified as a new entrant, meaning all material activity is concentrated in the most recent filing window—indicating a sharp ramp-up rather than a long-standing IP position.
6 patent recordsLG Electronics
LG Electronics holds 4 patent records and is the highest-ranked pure commercial electronics company in the corpus. Its technical focus falls under H01L semiconductor devices—a different classification branch from the dominant H10K cluster used by academic filers—suggesting a device-engineering and module-integration emphasis rather than absorber-layer chemistry. This distinct route makes LG Electronics a meaningful reference point for manufacturing-oriented IP.
4 patent records| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| William Marsh Rice University | 5 | ▲ new entrant |
| Energy Materials Corp | 5 | ▲ new entrant |
| BRITE HELLAS SA | 4 | ▲ new entrant |
| Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences | 2 | ▲ new entrant |
| UNIST (Ulsan National Institute of Science and Technology) | 2 | ▲ new entrant |
| King Fahd University of Petroleum and Minerals | 2 | ▲ new entrant |
Under-served branches in photovoltaic devices, systems, and deposition
Several IPC branches adjacent to the dominant H10K core carry very low patent record counts relative to the field’s overall activity, representing areas where filing density is sparse. Whether each represents a genuine R&D opportunity depends on technical fit and commercial relevance.
H10F · Photovoltaic & light-sensitive devices
H10F holds only 4 patent records—about 5% of the corpus—despite being the most directly relevant IPC class for photovoltaic device claims. This sparsity likely reflects a classification lag as applicants and examiners default to H10K for perovskite work, but it also means that inventors drafting claims explicitly in the H10F device-architecture framework face minimal prior-art density. Teams developing bifacial cell stack designs, rear-contact architectures, or light-trapping structures would find this branch worth targeting for differentiated claims.
Search this in Eureka →C23C · Coating & surface deposition
C23C appears only once in the corpus, representing roughly 1% of patent records, even though deposition process control—thin-film uniformity, interface passivation, and rear-surface coating for bifacial light capture—is central to manufacturing perovskite bifacial cells at scale. This extreme sparsity suggests that process-IP for physical and chemical vapor deposition routes into perovskite bifacial structures is largely unclaimed. An entry path exists for equipment makers or vertically integrated manufacturers seeking to protect proprietary deposition recipes and process sequences.
Search this in Eureka →How leading filers diverge across IPC technology routes
Route coverage across the main technology branches in the current evidence set.
| Player | H10K 30 · Organic semiconductors (OLED etc.) | H10K 71 · Organic semiconductors (OLED etc.) | H10K 85 · Organic semiconductors (OLED etc.) | H01L 31 · Semiconductor devices | H10K 39 · Organic semiconductors (OLED etc.) |
|---|---|---|---|---|---|
| William Marsh Rice University | Strong · 6 | Absent | Strong · 6 | Absent | Absent |
| Energy Materials Corp | Strong · 5 | Moderate · 2 | Strong · 3 | Absent | Absent |
| BRITE HELLAS SA | Strong · 4 | Moderate · 1 | Moderate · 1 | Absent | Strong · 3 |
| Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences | Strong · 3 | Strong · 2 | Strong · 3 | Absent | Absent |
| Wuxi Utmost Light Technology Co., Ltd. | Strong · 2 | Strong · 2 | Strong · 2 | Absent | Moderate · 1 |
| China Huadian Engineering Co., Ltd. | Strong · 2 | Strong · 2 | Absent | Absent | Strong · 2 |
| Huadian Zhongguang New Energy Technology Co., Ltd. | Strong · 2 | Strong · 2 | Absent | Absent | Strong · 2 |
Frequently asked questions
The corpus contains 60 patent families in scope. Activity is distributed across a broad set of applicants, with no single filer holding more than 6 patent records in the top-100 applicant ranking.
William Marsh Rice University leads with 6 patent records, followed by Energy Materials Corp with 5. Both are classified as new entrants, meaning their filings are concentrated in the most recent window.
China is the leading filing office, followed by the United States, Europe (EPO), India, and WIPO PCT routes. South Korea, Canada, and Malaysia also appear with lower counts.
The field is in a Growth stage. The recent three-year filing window sits well above the prior three-year window, confirming multi-year expansion. Annual volume has eased from the 2023 peak, consistent with normal publication lag rather than a real slowdown.
H10K (organic semiconductors) dominates with 51 patent records, reflecting how perovskite absorber layers and charge-transport materials are classified under that branch. Dedicated photovoltaic branches H10F and H02S are comparatively sparse despite their direct relevance to solar cell device claims.
The only documented co-applicant relationship is between Huadian Zhongguang New Energy Technology and China Huadian Engineering, with 3 joint filings. Both are part of the same state-owned energy group. No cross-institutional or cross-border co-filing clusters are evident from current evidence.
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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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