Through Oxide Via Interposer Technology Landscape 2026
Through Oxide Via Interposer Technology Landscape 2026
TOV interposers replace bulk silicon with silicon oxide substrates, delivering lower substrate loss for RF, HBM, and AI accelerator packaging. This report maps structural approaches, fabrication innovations, and key assignees across retrieved patent and literature records.
What Is Through Oxide Via (TOV) Interposer Technology?
Through Oxide Via (TOV) interposer technology uses silicon oxide (SiO₂) or spin-on oxide layers as the primary substrate for interposers, with conductive through-vias (TVs) penetrating vertically through the oxide body. This contrasts with Through Silicon Via (TSV) technology, where bulk silicon — with its inherent substrate losses and parasitic coupling — forms the interposer body.
Two distinct structural implementations are represented in this dataset: silicon oxide interposers with conductive TVs and redistribution layers (RDLs), where the oxide matrix provides full electrical isolation without secondary liner deposition; and spin-on oxide formation processes, where a dielectric layer is deposited on a temporary carrier, etched, filled with conductive material, and released for wafer-scale fabrication of ultra-thin oxide interposers.
Supporting sub-technologies include redistribution layer (RDL) routing, under bump metallurgy (UBM) integration, oxidation-based liner formation on silicon substrates, and vertical tabbed via geometries for crosstalk suppression. Key adjacent references include Through Silicon Via (TSV) literature and high-bandwidth memory (HBM) interposer channel design work that motivates signal integrity improvements through oxide-based media.
In this dataset, TOV interposer innovation is highly concentrated: TSMC alone accounts for the three most recent and most architecturally specific filings (2022–2025), while Qualcomm’s 2014 filing remains the key prior-art anchor. Among retrieved records, the United States is the dominant filing jurisdiction, representing 5 of 6 core TOV-relevant patents in this dataset.
TOV Technology Clusters and Innovation Timeline
Based on publication dates across retrieved results, TOV interposer technology shows a clear developmental arc from foundational interposer concepts (pre-2010) through TSV scaling and oxide liner development (2008–2014), RF and 3DIC specialization (2020–2022), and spin-on plus nanosheet integration (2024–2025).
TOV Technology Cluster Distribution — Retrieved Records
In this dataset, four distinct technology clusters are identified, with Cluster 2 (Full Oxide Substrate Interposers) and Cluster 1 (Thermal Oxide Liner Interposers) accounting for the most architecturally specific TOV patent filings among retrieved records.
↗ Click bars to exploreTOV Innovation Timeline — Filing Activity by Era (Retrieved Records)
In this dataset, filing activity accelerates markedly from a single foundational filing pre-2010 to three filings in the 2020–2025 era, with TSMC’s 2022–2025 filings representing the most recent and architecturally specific contributions among retrieved records.
↗ Click bars to exploreKey Application Domains for TOV Interposer Technology
Retrieved records identify six distinct application domains where TOV and oxide-via interposer technology is deployed or proposed, ranging from RF millimeter-wave systems to hardware security enforcement in chiplet ecosystems.
RF and Millimeter-Wave SiP
TSMC’s 2022 US patent claims a CoWoS structure with a silicon oxide interposer containing no metal ingredients, where electrically conductive TVs provide all conduction and RDLs are formed on the oxide surface — explicitly targeting 5G and mmWave RF SiP integration. A 2021 literature study further validates redundant TSV architectures on high-resistivity silicon interposers using CPW transmission line test structures for millimeter-wave applications.
RF PackagingHBM and AI Accelerator Packaging
A 2022 literature study proposes a tabbed-via geometry modification to suppress far-end crosstalk in HBM interposer channels, deriving analytical capacitance models and comparing against microstrip and stripline configurations for next-generation HBM performance. The 2020 Chiplet Heterogeneous Integration review contextualizes oxide interposers as a solution for overcoming Moore’s Law scaling limitations in AI GPU packaging over 2.5D interposer platforms.
AI Accelerator Packaging3D Active Photonic Interposer
A 2022 study demonstrates co-fabrication of TSV and edge couplers in RDL-TSV-RDL structures for active photonic interposers targeting next-generation data center optical modules operating at 400G and beyond. Oxide interposers — which are optically transparent and low-loss — are positioned in retrieved records as candidate platforms for co-packaged optics (CPO) architectures in AI data centers.
Photonic IntegrationSecurity-Enforcing Chiplet Integration
The 2020 literature work “2.5D Root of Trust” demonstrates using the 2.5D interposer layer as a hardware security enforcement boundary, monitoring untrusted chiplet activity through physically isolated security logic on the interposer. Oxide interposers, with their superior RF isolation properties, are identified in this dataset as potentially advantaged for side-channel attack mitigation in multi-vendor chiplet ecosystems.
Hardware SecurityKey Patent Assignees in TOV Interposer Technology (Retrieved Records)
In this dataset, TOV interposer patent activity is concentrated among a small number of assignees. TSMC accounts for the three most recent and most architecturally specific filings in retrieved records (2022–2025), while Qualcomm’s 2014 filing remains the key prior-art anchor for oxide-insulated silicon-substrate interposers in this dataset.
TOV Interposer Patent Filings by Assignee (Dataset Snapshot)
↗ Click bars to exploreTaiwan Semiconductor Manufacturing Co.
TSMC holds 3 directly relevant TOV-specific US patents in this dataset, spanning 2022 to 2025. Their 2022 filing claims a CoWoS silicon oxide interposer with no metal ingredients and electrically conductive TVs for RF applications; their 2024 filing introduces a spin-on oxide process for wafer-scale carrier-free interposer fabrication; their 2025 filing embeds disposable oxide interposers within GAA/nanosheet transistor flows at the 2 nm node. All three are active US filings.
United StatesQualcomm Incorporated
Qualcomm holds 1 pivotal TOV-relevant US patent in this dataset: the 2014 “Low Cost Interposer Comprising an Oxidation Layer,” which explicitly claims a silicon substrate interposer with a via and a thermal oxide isolation layer between the via and substrate. This filing is now inactive (lapsed), establishing it as a prior-art anchor that creates a partial freedom-to-operate corridor for thermal oxide liner interposer designs on silicon substrates.
United StatesForward-Looking Trends in TOV Interposer Technology
Based on the most recent filings (2024–2025) in this dataset, three forward directions are identifiable: spin-on oxide fabrication enabling carrier-free wafer-scale interposers, oxide via integration into nanosheet and GAA transistor flows, and interposer-layer hardware security enforcement for multi-vendor chiplet ecosystems.
Spin-On Oxide Interposer Fabrication (Carrier-Free, Wafer-Scale)
TSMC’s 2024 US patent introduces a process where the oxide interposer is formed entirely from a spin-on layer, eliminating the need for a permanent bulk silicon carrier. The UBM-first-surface coplanarity achieved by this process enables tighter bump pitch and thinner package profiles. This is identified in retrieved records as a direct enabler for next-generation AI package form factors.
Oxide Via Integration into Nanosheet and GAA Transistor Flows
TSMC’s 2025 US patent reveals that oxide interposer concepts — specifically disposable oxide layers that are later recessed or removed — are being embedded directly within advanced logic transistor fabrication at the 2 nm node and below. This signals a convergence between packaging-level oxide via technology and front-end-of-line device integration, repurposing interposer oxide concepts as inner spacers in GAA architectures.
TOV Interposer vs. TSV Interposer: Key Dimensions
Click any row to explore further.
| Dimension | TOV Interposer (Oxide Substrate) | TSV Interposer (Silicon Substrate) |
|---|---|---|
| Substrate Material | Silicon oxide (SiO₂) or spin-on oxide — no bulk silicon in body | Bulk silicon wafer as mechanical carrier |
| Electrical Isolation | Full electrical isolation provided by oxide matrix — no secondary liner required | Requires CVD oxide, polymer, or nitride liner between via conductor and substrate |
| RF / High-Frequency Performance | Low substrate loss — advantaged for 5G, mmWave, and RF SiP applications per TSMC 2022 filing | Silicon substrate loss is a fundamental limitation at mmWave frequencies; high-resistivity silicon mitigates but does not eliminate |
| Via Geometry | Conductive TVs (Through Vias) through oxide body; tabbed-via geometry for crosstalk suppression per 2022 HBM study | Through Silicon Vias (TSV); 11 μm diameter, 10:1 aspect ratio demonstrated with void-free Cu electroplating per 2022 study |
| Fabrication Process | Spin-on oxide on temporary carrier, etch, conductive fill, carrier removal, UBM formation — wafer-scale per TSMC 2024 | Etch silicon, deposit liner, fill metal, CMP — established high-volume manufacturing process since 2008 (Fraunhofer IZM, Silex) |
| Commercial Maturity | Emerging — key patents filed 2022–2025; no CN/KR/EU jurisdiction filings retrieved in this dataset | Established — pitch and process norms set by 2008; multi-assignee distribution characteristic of mature technology |
| Key Patent Assignee (Retrieved Records) | TSMC (3 filings, 2022–2025, US); Qualcomm prior art anchor (2014, now inactive) | Fraunhofer IZM (2008 literature), Silex (2008 literature), IBM (2014 Cu TSV/SOI-CMOS literature) |
Frequently Asked Questions: Through Oxide Via Interposer Technology
A TOV interposer uses silicon oxide (SiO₂) or spin-on oxide as the substrate body, with conductive through-vias penetrating the oxide. A TSV interposer uses bulk silicon as the mechanical carrier, requiring oxide, polymer, or nitride liners to isolate the via conductor from the substrate. The oxide substrate in TOV designs provides full electrical isolation without secondary liner deposition and reduces substrate loss at high frequencies.
In this dataset, Taiwan Semiconductor Manufacturing Co. (TSMC) is the most active assignee with three directly relevant US patents: a 2022 filing for a 3DIC RF CoWoS package with a silicon oxide interposer, a 2024 filing for a spin-on oxide interposer fabrication process, and a 2025 filing integrating oxide interposer concepts into GAA/nanosheet transistor flows.
Silicon substrate loss is a fundamental limitation at 5G and mmWave frequencies. A full silicon oxide interposer body eliminates this loss pathway. TSMC’s 2022 US patent explicitly claims a silicon oxide interposer with no metal ingredients for use in high-frequency RF SiP integration. A 2021 literature study also validates millimeter-wave interposer channel design on high-resistivity silicon using CPW transmission line structures.
TSMC’s 2024 US patent describes a process where the oxide interposer is formed from a spin-on dielectric layer deposited on a temporary carrier, etched to define TV channels, filled with conductive material, and then released from the carrier. This eliminates the need for a permanent bulk silicon carrier, achieving UBM-first-surface coplanarity that enables tighter bump pitch and thinner package profiles for next-generation AI package form factors.
Qualcomm’s 2014 US patent ‘Low Cost Interposer Comprising an Oxidation Layer’ is now inactive (lapsed). It remains the key prior-art anchor for oxide-insulated silicon-substrate interposers, and its lapsed status creates a partial freedom-to-operate corridor for designs using thermal oxide isolation on silicon substrates. However, TSMC’s more recent claims on full-oxide-body and spin-on architectures represent distinct positions.
Retrieved records identify six application domains: high-frequency RF and millimeter-wave SiP (TSMC 2022); high-bandwidth memory and AI accelerator packaging (HBM tabbed-via crosstalk study 2022); 3D optical transceiver and photonic integration targeting 400G+ data center modules (2022); 3D wafer-level integration and MEMS (Fraunhofer IZM and Silex 2008); power delivery and DC-DC conversion (Infineon 2009); and security-enforcing chiplet integration using the interposer as a hardware security boundary (2020).
Data and insights on this page are based on a limited patent and literature dataset and are for reference only. Figures may not represent the complete technology landscape.