TOPCon Anti-Reflective & Texturing Patent Landscape
The TOPCon anti-reflective and texturing field is still expanding on a multi-year basis, with the field growing 304% in recent years, though annual volume has eased from its 2023 peak. Activity is heavily concentrated in China, with a tight cluster of solar manufacturers and state-owned energy groups holding the leading positions.
Chinese solar manufacturers lead a moderately concentrated field
Chuzhou Jietai New Energy Tech Co Ltd holds the top position by patent records, followed closely by the Qinghai Huanghe Hydropower Development cluster and National Electric Power Investment Group Yellow River affiliates. The top five filers account for 23% of the combined total of the hundred largest filers, indicating a field where a handful of well-resourced players have staked early ground but have not yet locked out challengers.
The tier gap between the leader (19 patent records) and the mid-table players (7–11 patent records) is relatively narrow, suggesting the competitive hierarchy is still being established. No single player has achieved an overwhelming positional advantage.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Chuzhou Jietai New Energy Tech Co Ltd | 19 | |
| 2 | Qinghai Huanghe Hydropower Development Co Ltd | 17 | |
| 3 | National Electric Power Investment Group Yellow River Upstream Hydropower Development Co Ltd | 13 | |
| 4 | Chint New Energy Technology Co Ltd | 11 | |
| 5 | Qinghai Huanghe Hydropower Development Co Ltd Xi’an Solar Power Branch | 11 | |
| 6 | Qinghai Huanghe Hydropower Development Co Ltd Xining Solar Power Branch | 11 | |
| 7 | Trina Solar Co Ltd | 9 | |
| 8 | Mianyang Xinhao New Energy Technology Co Ltd | 9 | |
| 9 | Wuhu GS-Solar Integrated New Energy Technology Co Ltd | 8 | |
| 10 | Jolywood (Taizhou) Solar Technology Co Ltd | 7 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Huai’an Jietai New Energy Technology Co Ltd | 7 | |
| 12 | Hanwha SolarOne (Qidong) Co Ltd | 7 | |
| 13 | Jiangsu Runergy Century Photovoltaic Technology Co Ltd | 7 | |
| 14 | LONGi Solar Technology (Xi’an) Co Ltd | 5 | |
| 15 | Popsolar Technology (Taixing) Co Ltd | 5 | |
| 16 | Yingli Energy Development Co Ltd | 5 | |
| 17 | Runma Solar Technology (Jinhua) Co Ltd | 5 | |
| 18 | Jinneng Photovoltaic Technology Co Ltd | 5 | |
| 19 | Jineng Clean Energy Technology Ltd | 4 | |
| 20 | Shanxi Zhonglai Solar Cell Technology Co Ltd | 4 |
The leaders’ positions imply that both specialized solar cell manufacturers and vertically integrated state-owned energy developers are investing in this process layer, reflecting the strategic importance of anti-reflective and texturing steps to TOPCon cell efficiency.
Filings from 2024 onward are subject to standard publication lag of 12–18 months and will be undercounted; the apparent softening in 2024–2026 data should not be read as a change in activity level. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Rapid multi-year growth led by semiconductor device filings, with surface coating as a secondary stream
Two charts capture both the filing trajectory and the technology mix of this corpus: the annual trend reveals when activity accelerated, and the IPC composition shows which technical routes dominate.
Annual filing trend
Activity was negligible before 2019, then stepped up in 2021 and surged sharply in 2022–2023, reaching a peak in 2023. The 2024 and 2025 bars appear lower but reflect publication lag rather than a real decline; the field remains in a growth phase on a multi-year basis with a 304% increase in recent years versus the prior window.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01L (semiconductor devices) dominates overwhelmingly, confirming that anti-reflective and texturing innovations are being filed primarily as device-level claims. C23C (coating and surface deposition) is the most meaningful secondary branch, pointing to process-level coverage of deposition techniques. H10F (photovoltaic and light-sensitive devices) and C30B (crystal growth) represent smaller but present secondary streams.
↗ 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.
Tunnel oxide passivated contact solar cell
A tunnel oxide passivated contact solar cell includes a semiconductor substrate, an emitter film layer, an anti-reflective layer, a first electrode, a tunnel oxide layer, a semiconductor film layer and a second electrode. The semiconductor substrate is a first type doped semiconductor, and the first surface of the semiconductor substrate includes a zigzag… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | 一种隧穿氧化层钝化接触太阳能电池及其制备方法 | 61 |
| 2 | 一种局部背场TOPCon太阳能电池及其制备方法 | 38 |
| 3 | 用于Topcon电池制作的poly-Si绕镀的去除方法 | 34 |
| 4 | 一种钙钛矿/晶硅叠层电池及其制备方法 | 29 |
| 5 | 一种背结背接触太阳能电池结构及其制备方法 | 29 |
| 6 | 一种N型TOPCon太阳能电池制备方法 | 26 |
| 7 | 一种P型隧穿氧化物钝化接触太阳能电池及其制备方法 | 22 |
| 8 | 电池背面结构及双面TOPCon太阳能电池 | 21 |
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 competitive structure means for R&D investment
Four structural dimensions — maturity, concentration, collaboration, and geography — each carry distinct implications for where to focus resources and how to differentiate.
Growth stage, past its 2023 filing peak
The lifecycle evidence classifies this field as Growth: the recent three-year filing window sits well above the prior three-year window, with 304% growth, confirming the field is still expanding on a multi-year basis. Annual volume has eased from its 2023 peak, and publication lag further understates 2024–2026 data. Core device-level claims are being filed actively, but the field has not yet entered a maturity plateau where incremental improvement dominates.
Growth · past 2023 peakModerate concentration, narrow tier gap — entry window remains open
The top five filers account for 23% of the hundred largest filers’ combined total, and the spread between the leader (19 patent records) and mid-tier players is only about half that count. No applicant has built an insurmountable positional lead. An entrant with differentiated process IP — particularly in surface deposition or crystal growth — could establish a competitive position before the field matures.
Moderate concentrationState-owned energy affiliates form the dominant co-filing cluster
The strongest co-filing relationships documented in the evidence involve the Qinghai Huanghe Hydropower Development entities, National Electric Power Investment Group Yellow River Upstream affiliates, and their regional solar power subsidiaries, with the most active pair sharing 17 co-filed records. This tightly networked state-owned cluster effectively operates as a single coordinated filer and should be treated as a consolidated competitive bloc when assessing market access or licensing paths.
SOE-anchored clusterChina-dominant filing base with minimal international coverage
China accounts for 227 of the patent records in the corpus, making it the overwhelmingly dominant jurisdiction. WIPO (PCT) records stand at 7 and US filings at 5, with Europe (EPO) at 3. This concentration means most incumbents have limited international patent protection outside China, creating potential freedom-to-operate in Western markets — but also signaling that non-Chinese actors have largely not yet engaged with this specific sub-field.
China-centric · limited PCTGo 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 |
|---|---|---|
| Qinghai Huanghe Hydropower Development Co Ltd | National Electric Power Investment Group Yellow River Upstream Hydropower Development Co Ltd | 17 |
| Qinghai Huanghe Hydropower Development Co Ltd | Qinghai Huanghe Hydropower Development Co Ltd Xi’an Solar Power Branch | 12 |
| Qinghai Huanghe Hydropower Development Co Ltd | Qinghai Huanghe Hydropower Development Co Ltd Xining Solar Power Branch | 12 |
| National Electric Power Investment Group Yellow River Upstream Hydropower Development Co Ltd | Qinghai Huanghe Hydropower Development Co Ltd Xi’an Solar Power Branch | 12 |
| National Electric Power Investment Group Yellow River Upstream Hydropower Development Co Ltd | Qinghai Huanghe Hydropower Development Co Ltd Xining Solar Power Branch | 12 |
| Qinghai Huanghe Hydropower Development Co Ltd Xi’an Solar Power Branch | Qinghai Huanghe Hydropower Development Co Ltd Xining Solar Power Branch | 12 |
| Qinghai Huanghe Hydropower Development Co Ltd | SPIC Xi’an Solar Power Co Ltd | 5 |
| National Electric Power Investment Group Yellow River Upstream Hydropower Development Co Ltd | SPIC Xi’an Solar Power Co Ltd | 5 |
| Qinghai Huanghe Hydropower Development Co Ltd | Huanghe Hydropower Xining Solar Power Co Ltd | 4 |
| National Electric Power Investment Group Yellow River Upstream Hydropower Development Co Ltd | Huanghe Hydropower Xining Solar Power Co Ltd | 4 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Chuzhou Jietai leads; Qinghai Huanghe cluster is the dominant collaborative bloc
The top two positions are held by a specialized solar manufacturer and a state-owned hydropower-to-solar conglomerate that files through multiple affiliated entities. Both are new entrants in momentum terms, reflecting that this specific sub-field only took shape after 2019.
Chuzhou Jietai New Energy Tech Co Ltd
Chuzhou Jietai New Energy Tech Co Ltd leads the corpus with 19 patent records and carries a new-entrant momentum profile, consistent with the field’s post-2019 origin. Its technology emphasis is almost entirely concentrated in H01L 31 (semiconductor devices), with minor coverage in nanotechnology applications (B82Y 40) and crystal growth (C30B 29). Its sister entity Huai’an Jietai New Energy Technology Co Ltd adds a further 7 patent records, suggesting a coordinated filing strategy across the two companies.
patent records: 19Qinghai Huanghe Hydropower Development Co Ltd
Qinghai Huanghe Hydropower Development Co Ltd holds 17 patent records individually but is part of a closely coordinated state-owned cluster that includes National Electric Power Investment Group Yellow River Upstream affiliates and two regional solar power subsidiaries, collectively accounting for a combined 52 patent records. Momentum is classified as new entrant. Technology focus is concentrated in H01L 31, with secondary positions in C23C 16 (coating and surface deposition) and C30B 29 (crystal growth), giving this cluster slightly broader process coverage than the leader.
patent records: 17| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Chuzhou Jietai New Energy Tech Co Ltd | 18 | ▲ new entrant |
| Qinghai Huanghe Hydropower Development Co Ltd | 9 | ▲ new entrant |
| National Electric Power Investment Group Yellow River Upstream Hydropower Development Co Ltd | 9 | ▲ new entrant |
| Qinghai Huanghe Hydropower Development Co Ltd Xi’an Solar Power Branch | 9 | ▲ new entrant |
| Qinghai Huanghe Hydropower Development Co Ltd Xining Solar Power Branch | 9 | ▲ new entrant |
| Chint New Energy Technology Co Ltd | 6 | ▲ new entrant |
| Mianyang Xinhao New Energy Technology Co Ltd | 9 | ▲ new entrant |
| Wuhu GS-Solar Integrated New Energy Technology Co Ltd | 8 | ▲ new entrant |
Under-served IPC branches adjacent to the dominant semiconductor device core
Several IPC classes appear at low share in the corpus relative to H01L, suggesting they are adjacent to the mainstream anti-reflective and texturing focus. These observations reflect relative filing sparsity; they are not validated commercial opportunities without further investigation.
H10F · Photovoltaic & light-sensitive devices
H10F covers photovoltaic and light-sensitive device-level claims under the newer IPC harmonized classification and currently accounts for 18 patent records — a 5% share of the corpus. Given that TOPCon anti-reflective and texturing innovations are inherently photovoltaic, the low H10F count likely reflects a classification lag as practitioners continue filing under H01L rather than the reclassified H10F codes. An entrant intentionally drafting under H10F could establish an early position in this classification branch before the broader community migrates, though the technical coverage territory substantially overlaps with H01L 31.
Search this in Eureka →C30B · Crystal growth
C30B (crystal growth) accounts for 15 patent records at a 4% share, indicating that silicon wafer crystallization steps relevant to TOPCon surface quality have received limited dedicated filing attention in this sub-field. Crystal quality and surface morphology prior to texturing directly influence anti-reflection performance, making this an adjacent branch with plausible technical value. The sparsity may represent an entry path for equipment makers or materials companies with expertise in monocrystalline or multicrystalline silicon growth who can link crystal quality claims to TOPCon cell efficiency outcomes.
Search this in Eureka →How leading applicants differ by technology route emphasis
Route coverage across the main technology branches in the current evidence set.
| Player | H01L 31 · Semiconductor devices | C23C 16 · Coating & surface deposition | H01L 21 · Semiconductor devices | H10F 77 · Photovoltaic & light-sensitive devices | H10F 71 · Photovoltaic & light-sensitive devices |
|---|---|---|---|---|---|
| Chuzhou Jietai New Energy Tech Co Ltd | Strong · 18 | Absent | Absent | Absent | Absent |
| National Electric Power Investment Group Yellow River Upstream Hydropower Development Co Ltd | Strong · 17 | Absent | Absent | Absent | Absent |
| Qinghai Huanghe Hydropower Development Co Ltd | Strong · 17 | Absent | Absent | Absent | Absent |
| Chint New Energy Technology Co Ltd | Strong · 11 | Absent | Absent | Emerging · 2 | Absent |
| Qinghai Huanghe Hydropower Development Co Ltd Xining Solar Power Branch | Strong · 12 | Absent | Absent | Absent | Absent |
| Qinghai Huanghe Hydropower Development Co Ltd Xi’an Solar Power Branch | Strong · 12 | Absent | Absent | Absent | Absent |
| Jinneng Photovoltaic Technology Co Ltd | Absent | Strong · 4 | Absent | Strong · 4 | Strong · 4 |
Frequently asked questions
The evidence covers 245 patent families in scope. Filing activity was negligible before 2019 and accelerated sharply between 2021 and 2023, confirming this is a recently emerged sub-field within TOPCon cell manufacturing.
Chuzhou Jietai New Energy Tech Co Ltd leads with 19 patent records, followed by Qinghai Huanghe Hydropower Development Co Ltd with 17. The Qinghai Huanghe state-owned cluster, spanning multiple affiliated legal entities, is the most powerful coordinated bloc when treated as a consolidated group.
Yes, it is classified as Growth. Recent three-year filings are 304% above the prior three-year window, confirming multi-year expansion. Annual volume has eased from its 2023 peak, and 2024–2026 data are further understated by publication lag, so the apparent recent softening does not indicate a real decline.
H01L (semiconductor devices) is the dominant branch with 228 patent records, reflecting that most innovations are filed as device-level claims. C23C (coating and surface deposition) is the leading secondary branch at 44 patent records, followed by H10F (photovoltaic and light-sensitive devices) at 18 and C30B (crystal growth) at 15.
China accounts for 227 of the patent records, making it overwhelmingly the primary jurisdiction. WIPO (PCT) filings stand at 7, US at 5, and Europe (EPO) at 3. This concentration means most incumbents have limited patent protection outside China, which may create freedom-to-operate in other regions.
Yes. The most active co-filing relationships involve the Qinghai Huanghe Hydropower Development entities and their National Electric Power Investment Group Yellow River affiliates, with the strongest pair sharing 17 co-filed records. This state-owned cluster effectively operates as a single coordinated filer and represents the most organized collaborative bloc in the corpus.
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