CIGS Solar Cell Light Management Patents: Leaders & White Space 2026
- Filing has cooled since a 2017 peak of 25 families, with the midpoint year 2022 sitting at 21 — a flat-to-declining trend rather than a growing one.
- H01L dominates the IPC mix at 488 of 585 records, while dedicated photovoltaic-specific classification (H02S) accounts for only 21 — most light-management claims are filed as general semiconductor art.
- The United States leads receiving offices with 261 filings, ahead of the EPO (107) and WIPO/PCT (106), pointing to where enforcement exposure concentrates first.
What this landscape covers
This dataset tracks 585 patent families published between 2015 and mid-2026 that combine CIGS thin-film solar cell construction with light-trapping, anti-reflection, or light-management layer claims. The search deliberately spans both dedicated photovoltaic classification and the much larger general semiconductor-device art, because much of the substantive claim activity in this field is filed under H01L rather than under solar-specific codes like H02S.
Filing activity peaked in 2017 and has not returned to that level since; the most recent year is necessarily undercounted because publication typically lags filing by around eighteen months. Read the 2025-2026 tail of any trend chart as a floor, not a ceiling.
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Filing trend and technology composition
Two views of the same 585-family dataset: how filing volume has moved year over year, and which classification codes carry the claim weight.
A peak in 2017, no clear recovery since
Annual filings ran at 25 in 2017, the high point of the series, before easing toward a midpoint of 21 in 2022. That trajectory reads as flat-to-declining rather than a technology still in a growth phase, though the final one to two years will revise upward as later publications land.
Claim activity concentrates in general semiconductor art
H01L (semiconductor devices) accounts for 488 of 585 records, dwarfing every other subclass. H10K (organic semiconductors), H01G (capacitors) and H10D (general semiconductor devices) each sit in the 30-60 range, while G02B (optics), B82Y (nanotechnology) and C23C (coatings) form a second tier around 27-32. H02S, the subclass built specifically for photovoltaic power generation, holds only 21 records — a reminder that filers in this space classify light-management inventions as device or optics art far more often than as solar-specific art.
Shares are the percentage of the 585 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on CIGS Solar Cell Light Management with Eureka
This page is one run against one query. Ask Eureka your own question about cigs solar cell light management and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records and a representative filing
US20140139410A1 — Multiple light management textures
Filed by Moser Baer Technologies in 2014, this application describes an optoelectronic device with a light management layer on a flat substrate carrying a first light management texture, overlaid by a planarization layer whose top surface reproduces a second, corresponding texture. The layered-texture approach lets a device combine two distinct light-trapping geometries on a single stack rather than relying on one surface treatment.Abstract trimmed for length; see the full record for complete claim language.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6040521A | N-type window layer for a thin film solar cell and method of making | 261 |
| 2 | US20130140649A1 | Transient devices designed to undergo programmable transformations | 235 |
| 3 | US20090229652A1 | Hybrid solar concentrator | 172 |
| 4 | US20080006319A1 | Photovoltaic and photosensing devices based on arrays of aligned nanostructures | 165 |
| 5 | US20090020149A1 | Hybrid Multi-Junction Photovoltaic Cells And Associated Methods | 158 |
| 6 | US20080264477A1 | Methods for manufacturing three-dimensional thin-film solar cells | 135 |
| 7 | US20080210294A1 | Solar module structures and assembly methods for pyramidal three-dimensional thin-film solar cells | 123 |
| 8 | US20080157283A1 | Template for three-dimensional thin-film solar cell manufacturing and methods of use | 111 |
| 9 | US20090107545A1 | Template for pyramidal three-dimensional thin-film solar cell manufacturing and methods of use | 108 |
| 10 | US20030230338A1 | Thin film solar cell configuration and fabrication method | 102 |
Citation counts accumulate over time and favour older filings; treat them as a measure of influence on later art, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three read-throughs from filing volume, classification, and receiving-office spread that matter for where to search and where to file next.
Volume has not grown since the 2017 peak
The series peaks early and the 2022 midpoint reading of 21 sits below that peak, indicating filers have not scaled activity in this specific combination of CIGS and light-management claims even as the wider thin-film field has moved on. New entrants should not assume this is a rising curve.
Most claims sit in general semiconductor art, not solar-specific codes
H02S, the code built for photovoltaic power generation, covers only 21 records against 488 in H01L. Prior-art searches limited to solar-specific classification will miss the majority of relevant claims.
US filings lead but PCT and EPO volume is close behind
With 261 US-directed filings against 107 at the EPO and 106 via WIPO/PCT, enforcement risk concentrates in the US first, but the near-parity between EPO and PCT filings signals many applicants are still pursuing broad multi-jurisdiction protection rather than a single home market.
Collaboration is concentrated in a handful of recurring pairings
Only ten co-assignee pairs appear across the corpus, and the strongest of them link a small number of related corporate entities rather than broad industry consortia — collaborative filing here is the exception, not the norm.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to cigs solar cell light management, with the prior art for and against each one.
Who holds the claim space
Recent-year momentum across the tracked assignees shows little fresh activity: several previously active filers, including large research universities and materials companies, recorded zero filings in the latest year, one with a -100% year-on-year drop. That pattern is consistent with the flat overall filing trend and suggests the current assignee ranking reflects historical positioning more than active build-out.
Historical leaders have gone quiet
Assignees including major university research offices and established materials suppliers show zero filings in the most recent tracked year, with at least one recording a full -100% year-on-year decline. This does not necessarily mean exit from the field — publication lag can mask filings still in the pipeline — but it does mean the visible frontier of new claims is thin right now.
A long tail sits behind a small set of repeat filers
The assignee ranking is built from the full 585-family set, and the co-assignee data shows collaboration limited to ten identified pairs — most of the corpus consists of single-assignee filings rather than joint development programmes.
The densest collaboration is intra-group, not cross-industry
The strongest co-assignee pairing links two related Jinko Solar entities at 14 shared filings; the next strongest ties a university board to a nanotechnology energy firm at 10. These look like corporate-affiliate or licensing relationships rather than open industry collaboration.
| Assignee | Recent year | YoY |
|---|---|---|
| Solyndra, Inc. | 0 | — |
| California Institute of Technology (Caltech) | 0 | — |
| Board of Trustees of Michigan State University | 0 | -100% |
| Moser Baer India Limited | 0 | — |
| The Regents of the University of California | 0 | — |
| Applied Materials, Inc. | 0 | — |
| General Electric Company | 0 | — |
| MOSLEHI MEHRDAD M | 0 | — |
Where to take this analysis
The filing trend and classification split point to specific next steps depending on whether the goal is freedom-to-operate, licensing, or new filing strategy.
Search beyond H02S
Because 488 of 585 records sit under H01L against only 21 under the dedicated solar code, any clearance search restricted to photovoltaic classification will miss most relevant prior art in this field.
Run a full-text landscape searchWatch citation leaders for design-around risk
The most-cited records in this corpus, some over a decade old, still shape how later light-management claims are drafted around them; check freedom-to-operate against these before assuming the field has moved past them.
Review the most-cited recordsReassess the flat filing trend before committing R&D spend
With volume at or below its 2017 peak and several major historical filers showing zero recent activity, a fresh filing strategy should confirm whether competitors are quietly re-entering before assuming the space is settled.
Track assignee momentum in EurekaCommon questions on CIGS light management patents
In this landscape, a light management patent is one that claims structures or layers designed to trap, redirect, or reduce reflection of incident light within a CIGS thin-film solar stack — this includes anti-reflection coatings, textured light-trapping surfaces, and dedicated light management layers. The search covering this dataset combined CIGS-specific terminology with light-trapping and anti-reflection language, which is why the results span both photovoltaic-specific classification and general semiconductor-device codes like H01L. A patent does not need to mention 'solar' explicitly to be relevant if its claims read on a CIGS device stack.
The dataset shows filing peaking at 25 families in 2017 and easing to 21 by the 2022 midpoint, with no clear recovery visible since. This pattern is consistent with a technology area where core claim space filled early and subsequent effort shifted toward adjacent materials systems, such as perovskite or tandem architectures, rather than continued refinement of CIGS-specific light trapping. Publication lag means the final one to two years of any trend will always look lower than they eventually turn out to be, so some caution is warranted before reading 2025-2026 as a confirmed low point.
H01L is the broad semiconductor-devices classification, and it captures 488 of the 585 records in this dataset, while H02S, the code built specifically for photovoltaic power generation, holds only 21. This happens because many light-management inventions, such as textured layers, anti-reflection structures, or nanostructure arrays, are drafted and classified as general semiconductor-device or optical-element art rather than as solar-specific technology. Anyone running a freedom-to-operate search limited to H02S will miss the large majority of relevant prior art in this space.
The assignee ranking is built from all 585 tracked patent families, but recent-year momentum data shows several previously prominent filers, including major university research offices and materials companies, recording zero filings in the latest tracked year. One tracked assignee shows a full -100% year-on-year decline. This suggests the current ranking reflects historical filing strength more than ongoing build-out, though publication lag can understate genuinely recent activity that has not yet appeared in the record.
The clearest under-claimed areas sit at the intersections of the smaller IPC subclasses — for example, combining nanostructure-array light trapping (B82Y territory) with coating-based anti-reflection approaches (C23C), or integrating textured planarization overlays with hybrid concentrator-PV designs. These branches show meaningfully lower record counts than the dominant H01L core, which means less prior art density and more room for a first claim, though it also means less established precedent to build a design-around strategy from.
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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.