Silicon Wafer Supplier in Vietnam: A Sourcing Guide for Buyers

1. Why source semiconductor materials from Vietnam

For two decades Vietnam's role in the semiconductor supply chain was concentrated in assembly, packaging and test. That has been changing. Government policy has made semiconductors a strategic priority, major fabs and packaging plants have expanded their local footprint, and a domestic ecosystem of materials suppliers, research institutes and university programmes has grown around them.

For a buyer, three practical consequences follow:

• Regional proximity. Vietnam sits inside the East and Southeast Asian semiconductor cluster. Shipping times and freight costs to and from the region are materially lower than sourcing from Europe or North America.
• Supply chain diversification. Buyers who concentrated substrate sourcing in one or two countries have been actively adding alternatives. Vietnam is one of the options that has matured enough to be practical.
• Access for smaller orders. Large international wafer manufacturers frequently impose minimum order quantities that put them out of reach for a university lab or an early-stage company. Regional suppliers are generally willing to serve those volumes.

The honest counterpoint: Vietnam does not yet host large-scale domestic crystal growth for most substrate types. What a Vietnamese supplier provides is sourcing, technical selection, import handling, local stock and support — not, in most cases, local ingot production. Buyers should understand this distinction when evaluating suppliers anywhere in the region.

2. Materials and substrates available

Digifund supplies the following substrate families. Each is described in more detail in the sections below.

3. Silicon specifications in detail

Silicon accounts for most enquiries, so it is worth setting out the full parameter space. Every wafer order is defined by the following eight fields.

Two choices from this table drive cost more than the rest combined. The first is grade: Prime, Test and Dummy use the same base material and differ in surface defect density, flatness and inspection level. Laboratories commissioning equipment routinely consume dozens of wafers on calibration alone, and using Prime for that work is pure waste.

The second is resistivity tolerance. It is not the value that costs money but the width of the band. A request for 1–10 Ω·cm is easy to fill from standard stock; a request for 4.5–5.5 Ω·cm forces sorting and rejection, raising both price and lead time. Staying on the four standard bands above is the single easiest saving available.

4. Compound semiconductor substrates

Silicon carbide. Available in 4H and 6H polytypes, as N-type (nitrogen doped), high-purity semi-insulating (HPSI) and P-type, in Prime and research grades, with (0001) on-axis or 4° off-axis orientation at 350 or 500 µm thickness. The off-axis cut matters for epitaxy: it forces the grown layer to replicate the substrate polytype rather than nucleating a different one. N-type is used for vertical power devices; HPSI is used as the substrate for GaN-on-SiC HEMTs.

Sapphire. Single crystal Al₂O₃ at 99.999% purity, in C-plane (0001), A-plane, R-plane and M-plane orientations, from 0.43 to 1.0 mm thick, single or double side polished to epi-ready finish. C-plane is the workhorse for GaN LED epitaxy. Large 310 × 310 mm plates are available for heat-spreading applications.

GaAs. Semi-insulating (undoped), N-type (silicon doped) and P-type (zinc doped), in (100) and (111) orientations from 2 to 6 inch. Semi-insulating material is the standard substrate for MMICs and low-noise amplifiers, where a low-loss substrate is essential.

InP. Semi-insulating (iron doped), N-type (sulphur doped) and P-type (zinc doped) in (100) orientation from 2 to 4 inch, epi-ready. InP is the base material for 1310 and 1550 nm telecom lasers and detectors, since its direct bandgap sits in the wavelength band optical fibre uses.

SOI. Three-layer structure of device silicon over buried oxide over handle wafer, at 4, 6 and 8 inch, with device layers from 0.05 to 10 µm and BOX from 0.1 to 3 µm, produced by SmartCut or bonded (BSOI) processes. Typical configurations are a 2 µm device over 1 µm BOX for RF, 0.2 µm over 0.4 µm for FD-SOI, and 10 µm over 2 µm for MEMS.

5. Beyond wafers: targets, chemicals and cleanroom supplies

Substrates are rarely the only thing a fab or laboratory needs from a single purchase order. Digifund also supplies:

• Sputtering targets for physical vapour deposition of metals and dielectrics.
• High-purity semiconductor chemicals — photoresists, developers, etchants and CMP slurries.
• Cleanroom and laboratory equipment — garments, gloves, masks, glassware, furnaces, reactors and hotplate stirrers.
• Nanomaterials including graphene, graphene oxide, carbon nanotubes and titanium dioxide.
• Transparent conductive glass — ITO at 7, 10, 15 and 100 Ω/sq, and FTO at 15 Ω/sq for perovskite and dye-sensitised solar research.

Consolidating these onto one order reduces both administrative overhead and freight cost, which matters more than most buyers expect on small research orders.

6. Order sizes, lead times and shipping

Order sizes. Wafers ship in standard 25-piece cassettes. Full-cassette orders always carry better per-wafer pricing because vacuum packing, freight and import handling are spread across more pieces. Smaller quantities are accepted — this is a deliberate difference from large international manufacturers — but expect a higher unit price. If you need 18 wafers, ask for the price of 25 before deciding; the difference is often smaller than anticipated.

Lead times. Items held in local stock ship fastest. Made-to-order specifications, non-standard thicknesses, custom resistivity tolerances and less common orientations such as ⟨110⟩ take longer. If your project schedule permits waiting, say so in your enquiry — orders that can be folded into a shared production batch are quoted more favourably.

Packing. Polished wafers require cleanroom vacuum packing. This is not a place to economise: inadequate packing leads to surface contamination and particle adhesion that can render an entire lot unusable for lithography. Confirm packing specifications as part of the quotation, not after delivery.

Documentation. If your work requires traceability — publication, qualification or production — request the lot inspection report at quotation stage rather than on arrival.

7. What to include in a request for quotation

Sending a complete specification set produces an accurate quote on the first exchange instead of several rounds of clarification. Include:

• Material and growth method — for example CZ-Si, or 4H-SiC
• Diameter
• Grade — Prime, Test or Dummy
• Crystal orientation
• Doping type and dopant
• Resistivity band
• Thickness and tolerance
• Polish — SSP or DSP
• Quantity
• Destination and required-by date

Two optional items are worth adding because they frequently save money. State your end application: an engineer who knows you are building bulk MEMS rather than a photonic circuit can identify where you are over-specifying. State your deadline: flexibility on timing opens up batch options that are not otherwise offered.

8. About Digifund

Digifund is a semiconductor materials supplier founded in 2023 and based in Ho Chi Minh City, Vietnam. It supplies silicon wafers, compound semiconductor substrates, sputtering targets, high-purity chemicals, cleanroom equipment and nanomaterials to research institutes, universities and companies throughout Vietnam.

The company's technical advisory team includes semiconductor researchers affiliated with CNRS in France, IMEC in Belgium, Gachon University in South Korea and Griffith University in Australia, alongside its Vietnam-based founders. Enquiries are handled in English and Vietnamese, with responses within 24 business hours.

9. Frequently asked questions

Bạn đang tìm nhà cung cấp wafer bằng tiếng Việt? Đọc bản tiếng Việt: Silicon Wafer Việt Nam — nhà cung cấp wafer bán dẫn.