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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/perovskite-silicon-tandem-solar-cell-charge-transport-layer-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Photovoltaics & SolarPerovskite-Silicon Tandem Solar Cell Charge Transport Layer Patents
- Still accelerating, not maturing. filings dropped to zero at the 2022 midpoint before peaking at 9 in 2023, a pattern of a field still finding its footing rather than settling into an established design.
- Organic semiconductor classes dominate. H10K appears in 15 of 22 records and H01L in 13 — most of the claim activity sits in transport-layer chemistry and device architecture, not in dedicated photovoltaic subclasses.
- No single filer owns momentum. recent-year activity is thin across every named assignee, which leaves the leaderboard unsettled and the most-cited filings, not the newest ones, as the actual reference points.
22
Published Records
US
Leading Jurisdiction
9
Active Filers Ranked
2023
Peak Filing Year
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
This dataset tracks patent families at the intersection of perovskite-silicon tandem solar cells and the charge transport layer stack — electron transport layers, hole transport layers, self-assembled monolayers, and charge-selective contacts — filed against IPC classes covering organic semiconductor devices, general semiconductor devices, and photovoltaic-specific hardware. It captures 22 published patent families between 2015 and mid-2026, a small but tightly scoped corpus reflecting how recently monolithic tandem architectures have become a commercially serious filing target.
Because publication typically lags filing by around 18 months, the 2025 and 2026 figures in this dataset understate real filing activity; the true trajectory beyond the 2023 peak will only become visible as later applications publish.
Filing activity by year
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Perovskite-Silicon Tandem Solar Cell Charge Transport Layer covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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The numbers
Filing trend and technology composition
Two views of the same 22-family dataset: how filing activity has moved year over year, and which IPC subclasses carry the claim weight.
A late, uneven ramp
Filings rose from 4 in 2017 to a peak of 9 in 2023, but dropped to zero at the 2022 midpoint — evidence of episodic rather than steady investment, consistent with a technology still moving from lab demonstration to pilot-line qualification.
Organic semiconductor and general device classes lead
H10K (organic semiconductors, 15 records) and H01L (semiconductor devices, 13) account for the bulk of filings, with dedicated photovoltaic class H10F appearing in only 2 records — most applicants are claiming transport-layer materials and stack architecture rather than solar-cell-specific hardware.
Shares are the percentage of the 22 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Perovskite-Silicon Tandem Solar Cell Charge Transport Layer covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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The filings other applicants build on
Representative filing
WO2023161798A1 — metal fluoride interlayer for perovskite/silicon tandem devices
KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY
A perovskite/silicon tandem device places a hole transport layer between the silicon and perovskite layers, then adds an ultrathin metal fluoride layer in direct contact with the top of the perovskite layer before the second electrode. The construction targets the interface losses that occur when a transport layer and the perovskite absorber meet directly.Filed by King Abdullah University of Science and Technology, published 2023-08-31.
Most-cited records in this dataset
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20180019358A1 | Tandem solar cell, tandem solar cell module comprising the same, and method for manufacturing thereof | 55 |
| 2 | US20200212243A1 | Method for manufacturing perovskite silicon tandem solar cell | 30 |
| 3 | EP3270432A1 | Tandem solar cell and tandem solar cell module comprising the same | 7 |
| 4 | KR1020200127685A | Monolithic tandem solar cell comprising a photo-conversion film and a method for manufacturing the same | 6 |
| 5 | EP3270432B1 | Tandem solar cell and tandem solar cell module comprising the same | 5 |
| 6 | WO2023161798A1 | High-efficiency perovskite-based device with metal fluoride interlayer and method | 4 |
Citation counts favour older filings simply by virtue of being searchable longer — treat them as a measure of influence within this corpus, not of current technical importance.
Publication numbers are shown where the record carries one (6 of 6 rows); clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Perovskite-Silicon Tandem Solar Cell Charge Transport Layer covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the filing pattern signals
Three read-throughs from the trend, class mix, and citation data — useful for deciding where to file next and which prior art to clear first.
Filing pace
9 in 2023
peak year filings
Growth resumed sharply after a flat year
A zero-filing midpoint in 2022 followed by a peak of 9 in 2023 suggests a small number of applicants moved from lab-scale to filing-ready designs at roughly the same time, likely tracking published efficiency milestones for tandem cells rather than independent invention timing.
Trend basis: 2017–2026 filings
Claim geography
15 of 22
records tagged H10K
Transport-layer chemistry outweighs device hardware claims
With H10K and H01L covering the majority of records and H10F appearing only twice, most protection in this space is being built around material composition and layer architecture rather than cell-level device claims — a sign that the transport layer itself, not the tandem stack as a whole, is where applicants see defensible ground.
IPC composition, this dataset
Reference points
55 citations
top-cited record
Two early filings anchor the citation graph
The two most-cited records in the set draw a combined 85 citations, far ahead of the rest of the corpus — any freedom-to-operate review in this area should start with those two families before moving to newer, less-tested filings.
Citation counts, most-cited table
Eureka AI Agent
Looking for what nobody has claimed yet?
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to perovskite-silicon tandem solar cell charge transport layer, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Perovskite-Silicon Tandem Solar Cell Charge Transport Layer covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Players
Who is filing, and where the gaps sit
With 22 families spread across a handful of named assignees and no single filer showing sustained recent-year output, this is still an open field rather than one with an entrenched leader.
Momentum
1 in latest year
highest recent filer
Recent-year activity is thin across the board
The most active assignee in the latest tracked year filed just one family, and every other named assignee shows zero — recent momentum data cannot yet distinguish a leader, which means the most-cited historical filings remain the practical reference points for competitive positioning.
Recent-year momentum by assignee
Geography
US 10 · EPO 6
receiving offices
Filing is concentrated in the US and Europe
Ten records were filed with the United States and six with the European Patent Office, with WIPO/PCT, South Korea and Poland making up the remainder — a filing footprint typical of early-stage device technology still being routed through major examining offices before regional expansion.
Receiving office counts, this dataset
Composition
22 families
total in ranking
A small, unconcentrated corpus
At 22 total families, this is a narrow dataset by patent-landscape standards — assignees include solar manufacturers, universities and electronics firms, and none has filed enough volume to establish a dominant claim position across the transport-layer stack.
Assignee ranking, this dataset
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Swift Solar | 1 | — |
| LG Electronics | 0 | — |
| University of North Carolina at Chapel Hill | 0 | — |
| King Abdullah University of Science and Technology (KAUST) | 0 | — |
| Tongwei Solar (Chengdu) Co., Ltd. | 0 | — |
| Ulsan National Institute of Science and Technology (UNIST) | 0 | — |
| JA Solar Co., Ltd. | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Perovskite-Silicon Tandem Solar Cell Charge Transport Layer covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's Next
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, white-space filing, or tracking a competitor.
Clear the two anchor citations first
Before filing new transport-layer claims, review the two most-cited records in this set directly — they draw the bulk of downstream citations and are the most likely prior art an examiner will raise.
Run a citation check in EurekaWatch for the 2025–2026 publication lag to close
Filing activity after 2023 will look artificially low until later applications finish publishing; revisit the trend in 6–12 months before concluding the field has slowed.
Set a monitoring alert in EurekaMap the under-claimed transport chemistries
Self-assembled monolayer passivation and dopant-free hole transport materials show thin coverage relative to core transport-layer claims — a targeted search can confirm how open these branches really are.
Explore white space in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Perovskite-Silicon Tandem Solar Cell Charge Transport Layer covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions on this landscape
The two most-cited records in this dataset are US20180019358A1 and US20200212243A1, drawing 55 and 30 citations respectively — far ahead of the rest of the corpus. No single assignee shows sustained recent-year filing volume, so citation influence rather than filing count currently marks the most important players. Anyone assessing freedom to operate should treat these two families as the starting point rather than relying on the newest publications.
The dataset shows a midpoint dip to zero filings in 2022 sandwiched between growth years, which is unusual but not unheard of in a narrow, 22-family corpus where a handful of applicants drive most activity. It likely reflects a pause between early exploratory filings and a second wave tied to improved tandem cell efficiency results rather than a genuine slowdown in R&D. Filings resumed sharply in 2023, reaching the highest year in the dataset.
Both layer types appear together in this search scope because tandem devices need charge-selective contacts on both sides of the perovskite absorber, but the evidence does not break out separate counts for ETL versus HTL claims. In practice, hole transport layer claims tend to focus on interface stability and dopant-free chemistries, while electron transport layer claims more often address optical transparency and processing temperature compatibility with the underlying silicon cell. A full landscape search filtered specifically by layer type would be needed to quantify the split.
The data suggests yes: with only 22 total families, no dominant assignee, and thin coverage in specific branches like self-assembled monolayer passivation and dopant-free hole transport materials, there is meaningful room for new claims. The field is also still accelerating rather than flattening, based on the filing trend through the peak year. That said, the two heavily-cited anchor patents should be checked carefully before filing in overlapping claim territory.
WO2023161798A1 claims a perovskite/silicon tandem device with a hole transport layer on one side of the silicon and an ultrathin metal fluoride layer placed directly on top of the perovskite layer, before the second electrode. It does not block every hole-transport or interlayer approach — designs using different interlayer materials, different layer ordering, or electron transport layer modifications instead of hole-side interlayers would likely fall outside its specific claim scope. A clause-by-clause comparison against any planned device stack is still the reliable way to confirm clearance.
Answers are grounded in the same dataset. Derived from a Patsnap search on Perovskite-Silicon Tandem Solar Cell Charge Transport Layer covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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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.
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.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company's registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.