SHJ / HJT Production Line Patent Snapshot 2026
The SHJ/HJT production line patent corpus is very small and highly concentrated, with the top five filers accounting for 54% of the hundred largest filers’ combined total and all activity falling under the H01L semiconductor device classification. Annual filing volume peaked in 2021 and has eased since, placing the field in a decline stage on a recent-window basis.
A small, concentrated corpus led by LONGi Solar and individual inventors
LONGi Solar Tech (Xi’an) Co., Ltd. and Dr. Venkanna Kanneboina jointly head the applicant ranking, each with 2 patent records, followed by Tongwei Solar Energy (Chengdu), Shanghai Riyue New Energy, and Meyer Burger (Germany) among others.
The top five filers hold 54% of the ranked applicants visible in this query’ combined total, indicating strong concentration in a corpus that remains extremely limited in absolute size. A tier gap separates the two co-leaders from the remaining applicants, each of whom holds a single patent record.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | LONGi Solar Tech (Xi’an) Co., Ltd. | 2 | |
| 2 | Dr. Venkanna Kanneboina | 2 | |
| 3 | Tongwei Solar Energy (Chengdu) Co., Ltd. | 1 | |
| 4 | Shanghai Riyue New Energy Co., Ltd. | 1 | |
| 5 | Dr. Ranadheer Donthi | 1 | |
| 6 | Dr. S. Hemambika | 1 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 7 | Dr. M. Dhamodhara Naidu | 1 | |
| 8 | Dr. A. Srinivasa Pradeep | 1 | |
| 9 | Meyer Burger (Germany) GmbH | 1 | |
| 10 | Dr. Arundathi S. | 1 | |
| 11 | Dr. Jagadeeshwar Pashikanti | 1 |
LONGi Solar’s position reflects its broader push into HJT cell technology, while the presence of multiple individual Indian inventors and Meyer Burger (Germany) signals internationally distributed early-stage interest rather than a consolidated industrial race.
The most recent filing periods are subject to publication lag and may undercount activity; the small total size amplifies the effect of any single new filing on apparent trends. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Peak activity in 2021 followed by easing; technology mix entirely in semiconductor devices
The two charts below show annual filing activity from 2017 to date and the IPC technology composition of the corpus. Both are relevant to assessing whether the field is crowded or still open.
Annual filing trend
A single filing in 2017 was followed by inactivity until 2020, then a spike to 3 patent records in 2021 and 2 in 2022, with no recorded filings in 2023–2026. The 2021 peak and subsequent easing define the decline lifecycle stage. Recent zero-count years should be treated cautiously given publication lag.
↗ Hover for values · click a bar to ask EurekaTechnology composition
All 7 patent records fall under H01L (Semiconductor devices), with no secondary IPC classes represented. This uniformity reflects the inherently device-centric nature of HJT cell and production line patents at this corpus scale.
↗ 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.
Method of production of silicon heterojunction sol…
The present invention relates to a method of production of silicon heterojunction solar cells having at least one stabilization step, wherein the stabilization step is performed after amorphous silicon layers, and preferably also transparent layers or even metallic contact materials, have already been applied beforehand to crystalline silicon solar wafers… (excerpt from the patent abstract)
Open this patent in Eureka →| # | Patent | Citations |
|---|---|---|
| 1 | 双面受光的晶体硅/薄膜硅异质结太阳电池及制作方法 | 43 |
| 2 | Method of production of silicon heterojunction sol… | 2 |
| 3 | 一种背接触式硅异质结太阳能电池及其制备方法 | 1 |
| 4 | 一种背接触式硅异质结太阳能电池及其制备方法 | 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.
Assignee snapshot from the current evidence set
The applicants below are visible in this query result. Because the evidence set is relatively small, read this section as a directional snapshot rather than a full competitive ranking.
LONGi Solar Tech (Xi’an) Co., Ltd.
LONGi Solar leads with 2 patent records, all concentrated in H01L 31 (semiconductor devices for light conversion). As the world’s largest solar manufacturer, its HJT production-line patents represent a focused but limited formal IP footprint in this corpus. No recent momentum data is available for LONGi in the applicant momentum evidence, suggesting its filings fall in the earlier peak period rather than the most recent window.
patent records: 2Dr. Venkanna Kanneboina
Dr. Venkanna Kanneboina matches the leader with 2 patent records and is identified as a new entrant in the most recent filing window, with activity spanning both H01L 31 and H01L 51 (organic semiconductor devices). This cross-class interest distinguishes his filings from the purely H01L 31 focus of the corporate applicants and may indicate exploratory work on hybrid or organic-inorganic HJT structures.
patent records: 2Frequently asked questions
The corpus examined contains 7 patent families. This is a narrow dataset, and individual filings have an outsized effect on all ranking and trend metrics.
LONGi Solar Tech (Xi’an) Co., Ltd. and Dr. Venkanna Kanneboina are co-leaders, each holding 2 patent records. Tongwei Solar Energy, Shanghai Riyue New Energy, and Meyer Burger (Germany) each hold 1 patent record.
China leads with 4 patent records, followed by India with 2, and the United States with 1. Major HJT manufacturing markets such as Germany, Japan, and South Korea are not represented in this corpus.
Filing activity peaked at 3 patent records in 2021 and reached 2 in 2022, with no recorded filings in 2023–2026. The lifecycle stage is assessed as decline. Recent zero counts may partly reflect publication lag.
All 7 patent records in the corpus fall under H01L (Semiconductor devices). H01L 31 is the visible sub-class; H01L 51 appears in filings by several individual inventors. Process-oriented classes such as H01L 21 are absent from this corpus.
The most-cited work in the corpus is a patent on bifacial crystalline silicon/thin-film silicon heterojunction solar cells and their fabrication method, with 43 citations. A method-of-production patent for silicon heterojunction solar cells follows with 2 citations, and two back-contact HJT solar cell patents each carry 1 citation.
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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.