Where to Buy 6-Inch LNOI Wafers: Pricing, Specs & the 4-to-6 Inch Transition (2026)
To buy 6-inch LNOI wafers in 2026, start with direct wafer suppliers such as NanoLN, NGK Insulators, Soitec, Semicorex, Novel Si, and Partow Technologies, then use distributors such as MSE Supplies, SOKA, UniversityWafer, or PMOptics for small-quantity lab purchasing where available. 6-inch LNOI is now the industrial scaling format for foundry-compatible photonics, while 4-inch remains the lower-friction choice for academic R&D and early process work.
6-inch LNOI supplier and pricing table
| Supplier or distributor | 6-inch status | Indicative price | Useful specs | Best fit | Source URL |
|---|---|---|---|---|---|
| NanoLN (Jinan Jingzheng) | Commercial; 8-inch also listed in the research note | Quote required | GCIB trimming for <10 nm uniformity; 4/6/8-inch LNOI options | Production-oriented raw wafer sourcing and foundry qualification | nanoln.com |
| NGK Insulators | Mass production; 8-inch announced for 2026 in the research note | Quote required | Bonded wafers for high-reliability industrial programs | Industrial qualification and reliability-sensitive supply chains | ngk-insulators.com |
| Soitec | Commercial; 8-inch in development in the research note | Quote required | Smart Cut technology and foundry partnership model | Scaled semiconductor-style substrate programs | soitec.com |
| Semicorex | Available; 8-inch also listed in the research note | Quote required | Handle substrate flexibility including Si, quartz, SiC, and sapphire | Custom stack exploration across handle materials | semicorex.com |
| Novel Si | Available; 8-inch research phase in the research note | Quote required | China-based high-end research and local fab supply | Research programs that need China-capable LNOI sourcing | novelsi.com |
| Partow Technologies | Custom 6-inch work | Quote required | Crystal Ion Slicing for bespoke PIC substrates | Custom platform development and nonstandard stacks | partow-tech.com |
| MSE Supplies | Distributor path for small quantities | 4-inch $5,050-$5,820 [UNVERIFIED]; 6-inch approx. $7,170 [UNVERIFIED] | Online pricing and fast-shipping style procurement | Labs that need transparent purchase-order pricing | msesupplies.com |
| SOKA (Soka Tech) | Distributor path for stock items | 4-inch $1,800-$2,500 [UNVERIFIED]; 6-inch approx. $2,250 sale [UNVERIFIED] | Competitive listed pricing in the research note | Cost-sensitive lab prototyping where stock matches the spec | sokatech.com |
| UniversityWafer | Distributor and university procurement path | 4-inch approx. $4,000 [UNVERIFIED]; 6-inch quote required | Purchase-order friendly route for US university labs | Academic groups that need straightforward procurement workflow | universitywafer.com |
| PMOptics | Custom and bulk-buy path | 4-inch approx. $2,000-$4,500 [UNVERIFIED]; 6-inch quote required; MOQ 10 noted in the research note | Custom specs and bulk-buy discounts | Teams moving from one-off wafers toward repeat orders | pmoptics.com |
MgO doping typically adds $800-$1,500 per wafer to the base price [UNVERIFIED]. Pricing is volatile and depends on film thickness, BOX, cut, handle wafer, doping, trimming, certificates, and order quantity.
Standard 6-inch LNOI specifications
| Parameter | Common specification | Procurement note |
|---|---|---|
| Crystal cut | X-cut or Z-cut | X-cut is common for PICs and modulators; Z-cut is common for PPLN work. |
| Doping | 5.0 mol% MgO-doped | Used when higher optical damage resistance is required. |
| TFLN thickness | 400 nm or 600 nm | Common C-band modulator starting points; require tolerance and TTV data. |
| BOX thickness | 2.0 um or 3.0 um SiO2 | Thicker BOX can reduce substrate leakage for some designs. |
| Handle wafer | High-resistivity silicon or quartz | Quartz can matter for very high-bandwidth RF behavior; verify fab compatibility. |
| Handle resistivity | >1000 ohm-cm | High-resistivity silicon helps reduce RF attenuation. |
| Surface roughness | <0.5 nm Ra | Ask for metrology method and acceptance criteria. |
What changes when moving from 4-inch to 6-inch
The commercial case for 6-inch is area and tool compatibility: a 150 mm wafer offers 2.25 times the surface area of a 100 mm wafer and aligns better with automated foundry equipment for 800G and 1.6T photonics programs. The engineering case is more complicated. Larger LNOI wafers amplify thickness uniformity, bonding, bow, warp, and lithography focus problems.
On 4-inch wafers, +/-10 nm uniformity may be practical for many programs. On 6-inch wafers, the research note warns that uncorrected variation can rise to 30-50 nm, so buyers should ask whether Gas Cluster Ion Beam trimming is included and whether the supplier guarantees post-trim TTV. The larger bonded area also raises the probability of trapped particles, voids, and gases, so cleanliness and bond inspection data become more important.
Bow and warp are the other practical concern. Lithium niobate and silicon have different coefficients of thermal expansion, so annealing and downstream processing can create stress. At 6 inches, that stress can show up as wafer breakage, focus error, or handling yield loss unless the fab has qualified chucks, recipes, and metrology for 150 mm LNOI.
6-inch vs 4-inch decision checklist
- Choose 6-inch if your foundry flow, stepper, bonding, or DUV process expects 150 mm wafers.
- Choose 6-inch if the program is moving beyond proof-of-concept and needs die count, repeatability, or automated lithography.
- Choose 6-inch only after confirming TTV, bow, warp, particle count, void inspection, and GCIB trimming requirements.
- Stay with 4-inch if wafer cost is the main constraint and the work is still early R&D.
- Stay with 4-inch if your local tools, carriers, wet benches, lithography, or metrology are not qualified for 150 mm LNOI.
- Ask for 6-inch LNOI on quartz if ultra-high bandwidth above 110 GHz is central to the design; verify RF loss data before ordering.
- Model real yield, not only wafer area. The research note cites early 6-inch net functional yields of 60-70% versus mature 4-inch lines above 90% [UNVERIFIED].
Where labs buy small quantities
Small-quantity lab buyers usually care less about theoretical per-die economics and more about a clean purchase path, documented spec, and short lead time. MSE Supplies, SOKA, UniversityWafer, and PMOptics are the practical starting points from the research note, with the caveat that listed prices may describe a specific cut, BOX, film thickness, handle, or promotional stock item.
Before issuing a purchase order, ask the seller to confirm wafer diameter, flat or notch, cut, film thickness tolerance, BOX thickness, handle material, handle resistivity, MgO doping, TTV, bow, warp, roughness, particle count, wafer map availability, return policy for breakage, and whether the wafer is suitable for the intended process temperature.
Related procurement paths
For a broader wafer, modulator, and foundry shortlist, see the global TFLN/LNOI supplier guide. For earlier-stage supplier mapping across advanced materials and photonics, see deep-tech sourcing. For the way Asaptic structures supplier qualification, sampling, negotiation, and handoff, see the process.
Source URLs
- NanoLN
- NGK Insulators
- Soitec
- Semicorex
- Novel Si
- Partow Technologies
- MSE Supplies
- SOKA
- UniversityWafer
- PMOptics
Frequently asked questions
Where can buyers purchase 6-inch LNOI wafers in 2026?
Start with NanoLN, NGK Insulators, Soitec, Semicorex, Novel Si, or Partow Technologies for direct supplier qualification. For small lab quantities, distributors such as MSE Supplies, SOKA, UniversityWafer, and PMOptics may be easier procurement paths, but all pricing and stock status should be verified before purchase.
Are 6-inch LNOI wafers cheaper than 4-inch wafers?
Not for most small orders. A 6-inch wafer provides 2.25 times the area of a 4-inch wafer, but trimming, bow control, bonding yield, and early-line defect density can keep the per-wafer price higher until the program uses foundry-scale lithography and volume purchasing.
What specification should an integrated photonics buyer request?
A common PIC starting point is X-cut LNOI, 400 nm or 600 nm thin-film lithium niobate, 2-3 um buried oxide, and a high-resistivity silicon or quartz handle. Buyers should also request TTV, bow, warp, roughness, particle count, and whether GCIB trimming is included.
When should a lab stay with 4-inch LNOI wafers?
Stay with 4-inch wafers when the project is still in proof-of-concept, when wafer cost is the main constraint, when the design is tolerant of smaller-area processing, or when local tools are not qualified for 150 mm handling.
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