Plasma Assisted Etching Landscape 2026 — PatSnap Eureka
Plasma Assisted Etching: Innovation Intelligence for 2026
From foundational RIE frameworks to gate-all-around nanosheet release and green chemistry substitution — map the full plasma assisted etching IP landscape across 15+ assignees, 9 jurisdictions, and 4 decades of innovation using PatSnap Eureka.
Four Core Technical Axes in Plasma Assisted Etching
Plasma assisted etching (PAE) encompasses multiple sub-disciplines defined by how plasma is generated and how reactive species interact with the substrate. Within this dataset, the dominant technical axes are: (1) reactive ion etching (RIE) and its variants, where ion bombardment drives anisotropic material removal; (2) chemically selective plasma etching using fluorocarbon, halogen, or oxygen-based chemistries; (3) atmospheric pressure plasma processes that eliminate the need for vacuum infrastructure; and (4) plasma endpoint detection and process control systems that ensure etch termination accuracy.
Foundational work from Western Electric Co. (Bell System, filed 1978–1982) established the core framework of dry plasma etching for LSI devices, describing anisotropic etch profiles, trilevel resist processes, and the challenge of achieving submicron resolution without radiation damage. These early patents, filed across GB, AU, IL, and SG jurisdictions, form the scientific bedrock from which the entire field descended.
More recent literature expands the chemistry and materials envelope significantly: SF₆/O₂ mixed plasmas for silicon texturing and wide bandgap semiconductor etching; C₄F₈/Ar and HFIP-based chemistries for SiO₂ contact hole etching; O₂ plasma with SF₆ additive for Parylene C; and Cl₂/Ar systems for aluminum-doped zinc oxide (AZO) thin films. The dataset contains records from at least 15 distinct assignee organizations and spans jurisdictions including GB, US, KR, JP, EP, SG, AU, IL, and FR. For broader context on semiconductor IP strategy, the PatSnap Analytics platform provides comprehensive patent landscape analysis across device scaling domains.
According to WIPO, semiconductor manufacturing remains among the highest-volume patent filing categories globally, with dry etch processes consistently among the most contested sub-domains. The European Patent Office (EPO) has seen growing plasma etch filings from both Asian equipment OEMs and European specialty material companies since 2018.
Jurisdiction Distribution & Assignee Concentration
Key quantitative signals from the plasma assisted etching patent dataset, spanning 1978–2026 across 9 filing jurisdictions and 15+ assignee organizations.
Patent Filing Share by Jurisdiction
Korea (KR) accounts for approximately 35–40% of all patent records, reflecting both Korean semiconductor manufacturing scale and Japanese OEM filing strategies targeting KR as a key market.
Top Assignees by Active Patent Significance
Tokyo Electron and Lam Research hold the largest share of commercially active patents. At least 8 patents are currently active across the dataset; the majority of early Western Electric and Korean display filings are inactive.
Four Innovation Clusters Shaping Plasma Assisted Etching
The plasma assisted etching patent landscape organizes into four distinct innovation clusters, each addressing a different layer of the process stack — from mechanism physics to hardware architecture and process intelligence.
Reactive Ion Etching (RIE) and Ion-Assisted Anisotropic Etching
The dominant mechanism across the majority of retrieved patent records. Directed ion bombardment combined with reactive chemistry achieves vertical sidewall profiles essential to all semiconductor patterning. Key process gases include CF₄/O₂, C₄F₈/Ar, SF₆, HBr/O₂, and fluorocarbon mixtures. Western Electric's foundational GB filings (1980) established the framework; Robert Bosch GmbH (KR, 2007) introduced dynamic ion acceleration voltage modulation — a direct precursor to advanced Bosch-process deep silicon etching. Tokyo Electron's CF₃I-based method (KR, 2011) enabled high-precision deep sub-micron pattern formation with controlled self-bias voltage of ≥200 V.
Self-bias voltage ≥200 V for deep sub-micron patterningPlasma Chemistry Optimization and Selective Etching
A distinct cluster focuses on gas chemistry engineering to achieve high etch selectivity between target and mask/stop layers. Advanced materials chemistry is central here: Sungkyunkwan University (SKKU, 2022) demonstrated HFIP as a lower-GWP substitute for PFC gases in SiO₂ etching, achieving higher etch rates and thinner fluorocarbon films via in-situ oxygen radical generation. LTM (CNRS/CEA Grenoble, 2015) showed pulsed HBr/O₂ plasma increases silicon-to-SiO₂ selectivity and improves etch homogeneity versus continuous wave processing. Sandia National Laboratories (2020) identified mask erosion and micromasking as key challenges for GaN, SiC, Ga₂O₃, and diamond etching.
PMMA:PS selectivity of 6:1 via O₂/C₄F₈ mixed plasmasPlasma Source Architecture and Chamber Design
Hardware-level innovations address how plasma is generated, shaped, and delivered to the substrate. Lam Research (KR, 2014) introduced a slotted plasma grid partitioning the reaction chamber into upper (electron-ion plasma) and lower (ion-ion plasma) sub-chambers, substantially improving center-to-edge uniformity and isolated/dense (I/D) loading balance. Tokyo Electron (EP, 2019) disclosed a dual RF power supply system with a power modulation mode alternating between polymer deposition and etching power levels at a preset cycle, enabling fine profile control in sub-10 nm feature fabrication. SPTS Technologies (KR, 2025) addressed dechuck time reduction in high-temperature plasma etching using a bipolar electrostatic chuck (ESC) with a cooling gas system.
Dual RF modulation for sub-10 nm feature controlEndpoint Detection and Process Monitoring
Reliable etch termination is critical for yield in multi-layer device stacks. Hitachi Ltd. (GB, 1981/1983) established early optical emission monitoring principles for glow discharge plasma. Sumitomo Precision Products (EP, 2018) used a two-stage SF₆ supply scheme to isolate Si/SiFₓ optical emission signals during the low-flow step, enabling precise endpoint detection without dedicated endpoint areas on the wafer. Seoul National University (2021) extended OES-based virtual metrology to real-time etch profile prediction — not just etch depth — using plasma information (PI) variables in a statistical regression model. According to NIST, metrology innovation at advanced nodes is among the most critical enabling capabilities for sub-5 nm manufacturing.
Virtual metrology for full etch profile predictionWhere Plasma Assisted Etching Is Being Applied in 2026
Patent and literature records in this dataset span six distinct application domains, from mainstream IC manufacturing to emerging AR/VR optical component fabrication.
Five Frontier Directions Identified in the 2026 Dataset
The most recently filed patents and literature records in this dataset signal five distinct innovation vectors that R&D teams and IP strategists should monitor through 2027.
Selective Ge Etching for Gate-All-Around (GAA) Devices
The most recently published patent in this dataset — Tokyo Electron US Holdings (JP, February 2026) — discloses selective plasma etching of germanium-containing layers within Si/Ge thin film stacks using a fluorine/nitrogen/hydrogen agent plasma that simultaneously forms a passivation layer on exposed silicon surfaces to suppress silicon etching. This is a direct enabler of gate-all-around (GAA) transistor manufacturing at the 2 nm node and below.
High-Temperature Plasma Etching with Advanced Chuck Management
SPTS Technologies Limited (KR, filed 2025) specifically addresses dechuck time reduction in high-temperature etch applications using a bipolar ESC combined with a precision cooling gas system. This signals growing demand for plasma etching at elevated wafer temperatures — relevant to III-V, SiC, and certain high-k dielectric processes — where conventional dechucking becomes a throughput bottleneck.
Green Chemistry Substitution for PFC Gases
SKKU (2022) directly tackles semiconductor industry obligations to reduce perfluorocarbon (PFC) emissions. HFIP's embedded oxygen atoms generate in-situ radicals that replicate the fluorocarbon film thinning needed for high-selectivity SiO₂ etching without the full PFC emission load. This direction is expected to intensify as emissions regulations tighten post-2025. The US EPA has identified PFC reduction as a semiconductor manufacturing priority.
Faraday Cage Angular Ion Control for AR Optical Gratings
LG Chem (EP, 2023) represents a novel application of plasma etching to the fabrication of blazed diffraction gratings for augmented reality (AR) waveguides. By controlling the angular distribution of ions through a mesh Faraday cage and shutter mechanism, the process creates asymmetric (blazed) sawtooth profiles — a departure from conventional symmetric RIE and a signal that plasma etching is moving into precision optics manufacturing.
Plasma Etching Patent Activity Across Three Eras
The dataset spans 1978 to 2026, with geographic diversification toward KR and JP jurisdictions accelerating from 1996 onward and active commercially significant filings concentrating in the 2014–2026 maturation era.
Plasma Etching Innovation Timeline: Key Milestones by Era and Assignee
Three distinct eras define the landscape: Foundational (1978–1989) led by Western Electric/Bell Labs; Development (1996–2011) dominated by Tokyo Electron and Korean filings; Maturation (2014–2026) with Lam Research, LG Chem, and SPTS Technologies at the frontier.
What the 2026 Plasma Etching Landscape Means for R&D and IP Strategy
Gate-All-Around nanosheet processing is the most urgent near-term technical frontier. The 2026 Tokyo Electron patent on selective Si/SiGe etching signals that plasma chemistry for GAA transistor channel release is actively being locked down by leading equipment OEMs. R&D teams targeting 2 nm and below should prioritize F/N/H plasma chemistry development and passivation layer selectivity as core IP domains.
Lam Research and Tokyo Electron hold strong active IP positions in hardware architecture. Their internal plasma grid and dual-RF modulation patents (active in KR and EP) create meaningful freedom-to-operate constraints for new entrants designing plasma etch chambers. Competing architectures — such as atmospheric pressure plasma for certain applications — may offer differentiated paths to market. The PatSnap Analytics platform provides FTO analysis tools for exactly this type of landscape assessment.
Green chemistry substitution is both a regulatory requirement and a technical opportunity. The HFIP/C₄F₈ substitution work from SKKU (2022) and the broader PFC reduction agenda represent an under-patented space in the academic record. IP strategists should monitor whether fab-side filers (TSMC, Samsung, Intel) or chemistry suppliers accelerate patent filing in low-GWP etch chemistry between 2024 and 2027. For life sciences and chemicals IP strategy context, see PatSnap's chemicals intelligence solutions.
Wide bandgap semiconductor etching remains technically immature and IP-sparse. Sandia National Laboratories' 2020 review identifies Ga₂O₃, diamond, and high-Al-content AlGaN alloys as materials where optimum plasma chemistries remain poorly defined and mask erosion/micromasking problems are unsolved. This represents an open IP landscape for power electronics and RF device manufacturers investing in GaN-on-SiC and Ga₂O₃ platforms. The IEEE has identified wide bandgap device manufacturing as one of the defining technical challenges of the decade.
Faraday cage and geometric ion-steering methods for optical components are an emerging adjacent space. LG Chem's active EP patents (2022, 2023) on blazed grating fabrication via Faraday cage plasma etching signal that AR/VR optical waveguide manufacturing is pulling plasma etching expertise into a new precision optics vertical — one with very different process requirements and competitive dynamics from mainstream semiconductor fab. Teams with proven IP intelligence workflows will be best positioned to identify and act on this white space.
Plasma Assisted Etching — key questions answered
Plasma assisted etching (PAE) encompasses a family of dry-process techniques that use ionized gas species — radicals, ions, and photons — to selectively remove material from substrates with precision impossible in wet chemical etching. The technology is foundational to semiconductor device scaling, MEMS fabrication, advanced packaging, and emerging applications in wide bandgap semiconductors and photovoltaics.
Among retrieved patent records, at least 8 patents are currently active held by Lam Research, Tokyo Electron, ULVAC, LG Chem, Disco, SPTS Technologies, Samsung, and Taiwan Semiconductor Manufacturing. Tokyo Electron Limited and Lam Research Corporation together account for the largest share of active, commercially significant patents.
The most recent active patent in this dataset is Plasma Etching Technology (Tokyo Electron US Holdings, JP, published February 2026) covering selective Ge-layer etching in Si/Ge thin film stacks using F/N/H agent plasmas with passivation layer formation. This is a direct enabler of gate-all-around (GAA) transistor manufacturing at the 2 nm node and below.
The five key emerging directions are: (1) selective germanium etching in Si/Ge multi-stack architectures for gate-all-around devices; (2) high-temperature plasma etching with advanced chuck management; (3) green chemistry substitution for PFC gases using HFIP and C₄F₈; (4) Faraday cage-enabled angular ion control for optical gratings in AR waveguides; and (5) virtual metrology and AI-driven process control using OES-derived plasma information variables.
Among retrieved patent records, Korea (KR) dominates by filing count, accounting for approximately 35–40% of all patent records in this dataset, reflecting both Korea's position as a major semiconductor manufacturing hub and the filing strategies of Japanese equipment companies (Tokyo Electron, ULVAC) who extensively protect technology in KR as a key market. Great Britain (GB) represents the second-largest jurisdiction by count, largely due to the foundational Western Electric/AT&T filings of the 1978–1986 era. Japan (JP) and Europe (EP) each account for a meaningful share of more recent active filings.
Sandia National Laboratories' 2020 review identifies mask erosion and micromasking as the key challenges given the high bond strengths of these materials (GaN, SiC, Ga₂O₃, boron nitride, and diamond). Ga₂O₃, diamond, and high-Al-content AlGaN alloys are materials where optimum plasma chemistries remain poorly defined and mask erosion/micromasking problems are unsolved.
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References
- Plasma Etching Technology — Tokyo Electron US Holdings, Inc., JP, 2026
- Plasma etching method and apparatus — SPTS Technologies Limited, KR, 2025
- Plasma etching apparatus and plasma etching method — Tokyo Electron Limited, EP, 2019
- Internal plasma grid for semiconductor fabrication — Lam Research Corporation, KR, 2021
- Internal plasma grid for semiconductor fabrication — Lam Research Corporation, KR, 2014
- Plasma-enhanced etching in an augmented plasma processing system — Lam Research Corporation, SG, 2014
- Plasma etching method using Faraday cage — LG Chem, Ltd., EP, 2023
- Plasma etching method using Faraday cage — LG Chem, Ltd., EP, 2022
- End point detectable plasma etching method and plasma etching apparatus — Sumitomo Precision Products Co., Ltd., EP, 2018
- Plasma etching method, plasma etching device, plasma processing method, and plasma processing device — ULVAC, Inc., EP, 2018
- Method for anisotropic plasma etching of semiconductors — Robert Bosch GmbH, KR, 2007
- Method for plasma etching of a wafer — Disco Corporation, JP, 2024
- Plasma etching of wide bandgap and ultrawide bandgap semiconductors — Sandia National Laboratories, 2020
- Plasma Etching of SiO₂ Contact Holes Using Hexafluoroisopropanol and C₄F₈ — Sungkyunkwan University (SKKU), 2022
- Development of Virtual Metrology Using Plasma Information Variables to Predict Si Etch Profile — Seoul National University, 2021
- Silicon etching in a pulsed HBr/O₂ plasma. II. Pattern transfer — LTM (CNRS/UJF-Grenoble1/CEA), 2015
- High Selective Plasma Etching of PMMA to PS — Osaka Prefecture University, 2015
- SF₆ Optimized O₂ Plasma Etching of Parylene C — National Key Laboratory of Science and Technology on Micro/Nano Fabrication (Beijing), 2018
- Selective Plasma Etching of Polymeric Substrates for Advanced Applications — Jozef Stefan International Postgraduate School, 2016
- WIPO — World Intellectual Property Organization: Global Patent Filing Statistics
- European Patent Office (EPO) — Semiconductor Manufacturing Patent Trends
- NIST — National Institute of Standards and Technology: Semiconductor Metrology
- IEEE — Wide Bandgap Semiconductor Device Manufacturing
- US EPA — Perfluorocarbon Emissions Reduction in Semiconductor Manufacturing
All data and statistics on this page are sourced from the references above and from PatSnap's proprietary innovation intelligence platform. This landscape is derived from a limited set of patent and literature records retrieved across targeted searches and represents a snapshot of innovation signals within this dataset only.
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