Charge Transport Layer Patents: Who Leads in Perovskite Cells 2026
Charge transport layer patents for perovskite cells: who holds the claim space and where it is still open
Concentrated at the top. Five assignees account for 580 of 1,084 records in scope (53.5%), with a further long tail of single- and low-filing entrants. Filings rose from 9 in 2017 to a peak of 55 in 2025, but the only clean year-over-year comparison available is 2021 to 2024, where volume dropped from 52 to 38 records, a 27% decline. Years after 2024 are still filling in as publications catch up with filing dates, so treat 2025 and 2026 figures as incomplete rather than as evidence of a further slide.
- 1THE TRUSTEES OF PRINCETON UNIV187
- 2SAMSUNG DISPLAY CO LTD173
- 3THE RGT UNIV OF MICHIGAN108
- 4UNIV OF SOUTHERN CALIFORNIA70
- 5NORTHWESTERN UNIV42
See the full charge transport layers for perovskite cells analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions about this landscape
Who holds the most patents on perovskite charge transport layers?
One assignee leads the ranked list with 187 records, well ahead of the fifth-placed assignee at 42. The top five assignees combined hold 580 of the 1,084 records in scope, or 53.5%, so leadership is concentrated in a small group even though 100 companies appear somewhere in the ranking. Many of the largest holders are universities and display-industry firms whose IP predates dedicated perovskite research, since much of the underlying chemistry originates in OLED and organic semiconductor work.
Is patent filing in this area growing or slowing down?
Filings peaked so far at 55 in 2025, but the only reliable year-over-year comparison, 2021 to 2024, shows a 27% decline from 52 to 38 records. Publication lags filing by roughly 18 months, so the 2025 and 2026 counts are still incomplete and should not yet be read as a rebound or a continued slide. A clearer read on the recent trend will only be possible once another year or two of data has published.
What patent classes cover hole and electron transport layer technology?
The two dominant IPC subclasses are H10K, organic semiconductors including OLED-derived art, covering 76.8% of the 1,084 records, and H01L, semiconductor devices generally, covering 71.5%. Smaller but still meaningful shares sit in C09K materials, C07D heterocyclic compounds, H05B lighting circuits, H10D semiconductor devices and B05D coating processes. Because a single record can carry several class codes, these percentages add up to well over 100% and should not be summed together.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Charge Transport Layers for Perovskite Cells covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.