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Whether you need a single 25 mm diameter wafer 50 microns thick or 1000 wafers of 100mm Silicon polished on both sides to a thickness of 100 microns with TTV of 2½ microns, your requirements can be met.

Capabilities:

  • SOI wafer polishing
  • MEMS wafer polishing
  • Glass and Silicon wafers for anodic bonding
  • Backside and Double side Polishing
  • Edge and angle polishing
  • FZ Wafers and Ingots from stock
  • Extremely Thin Wafers
  • Germanium Wafers
  • Your Custom Requirements

Return to Home Page : Polished silicon wafers and polishing services

Silicon wafers

We have been polishing Silicon wafers for over 50 years, and also provide Silicon dicing services. We can provide any size Silicon wafer in custom dimensions from as large as 450mm to chips as small as .127mm square. SEMI standard Silicon wafers are also available in diameters 2”, 3”, 100mm, 125mm, 150mm, 200mm, 300mm and 450mm. Standard Silicon wafers can be thinned and polished to any custom thickness as thin as 10 microns thick and are available in standard tolerances, or as tight a thickness tolerance as +/- 1 micron.

We have extensive experience with providing silicon polishing and dicing services to clients in a variety of industries, such as research, optoelectronic applications, and product development in sensor and laser applications. We also provide edge-angle polishing for optoelectronic applications, and bonded wafer thinning. We can also thin and polish individual silicon dies and SOI (Silicon Oxide) layers.

Customize Silicon Wafers

Valley Design can customize a Silicon wafer to any size or thickness that you require for your project. We offer optical grade silicon CZ (Czochralski) in as-cut wafers, lapped or polished, as well as single and double side polished. Various orientations, resistivity and dopings are available. Valley Design can deliver Silicon wafers that meet your needs, no matter how specific your requests. Our Silicon polishing and dicing services are renowned for accuracy in meeting exacting specifications. We understand that providing top quality products and services are critical to our customers’ technology, which is why we always take the time to ensure that we understand the exact specifications of your order before setting to work.

Whether you are in the market for custom or SEMI standard Silicon wafers, or any other material such as optical glass, fused silica, fused quartz, ceramics such as Aluminum Nitride, 96% Alumina and 99.6% Alumina, Sapphire and more, Valley Design can help!

We supply:

  • Thin Silicon wafers – as thin as 0.001″ (25 microns)
  • Ultra thick Silicon wafers
  • Ultra pure to 10,000 ohm-cm
  • For CZ Silicon wafers currently available, please click here

We offer a complete line of polished Fused Silica , 99.6% Alumina, Aluminum Nitride , and Sapphire wafers and substrates.

Informative related Web sites:

www.customdicing.com Dicing Silicon and all other semiconductor material wafers
www.semi.org Semiconductor Equipment and Materials International (SEMI)
valleydesign.com Polishing all semiconductor materials and thinning wafers, substrates and dice
https://valleydesign.com/ultra-thin/ Ultra-thin Sapphire, Ceramics, Glass, Fused Silica and Semiconductor wafers and substrates
https://valleydesign.com/laser-slag/ Chamfering, blending, shaping and rounding wafers and substrates
www.avs.org AVS – The Science and Technology Society
https://valleydesign.com/germanium-crystals/ Germanium wafers and substrates

Silicon Carbide

Attainable tolerances on polished silicon carbide parts:

  • Flatness to a fraction of a wave
  • Thickness to millionths of an inch
  • Parallelism to millionths of an inch

Note: For best pricing, choose loosest acceptable tolerances.

Silicon carbide surface finishes attainable by polishing:

    • Silicon carbide manufactured by CVD process can be polished to a finish of a few Angstroms.
    • Reaction bonded silicon carbide can be polished to 20 – 50 Angstrom finish only.
    • Hot pressed silicon carbide is polishable to 50 – 100 Angstrom level.
    • Sintered silicon carbide polishes to 100 Angstroms and often much higher, depending on material quality.

Properties of different types of silicon carbide

SiC Type Density Therm. Cond.

W/mK

CTE x 10-6
20°C 1000°C
CVD 3.21 300 2.2 4.0
Reaction bonded 2.4 – 3.7 50 – 170 2.2 – 2.5 4.0 – 6.8
Hot pressed 3.1 – 3.3 50 – 160 2.3 – 2.5 4.3 – 4.5
Sintered 3.0 – 3.2 40 – 150 1.0 – 1.5 4.5 – 5.2

Please call or e-mail for further details.

CNC Ceramic Machining

Capabilities include:

  • CNC machining
  • Diamond grinding and slicing
  • Lapping and polishing
  • Laser cutting, drilling, scribing, shaping, machining
  • Stress relieving – high temperature and cryogenics
  • Edge polishing and chamfering
  • Core drilling
  • CNC dicing
  • Part sizes ranging from 1/4mm square up to 450mm diameter wafers

Valley provides lapping, polishing, dicing, grinding, hole drilling and CNC machining various slots and features in these and other materials. We are pleased to offer these products and services from beginning prototype stages up through to full production.

Related ceramic machining information:

Precision machined ceramics and ceramic substrates

Aluminum Nitride

  • Heat sinks
  • Fiber optic and wireless applications
  • Laser diode submounts
  • Substrates for thin film applications
  • Substrates for thick film applications
  • Polished aluminum nitride substrates
  • Super-thin AlN substrates
  • Direct bond copper AlN substrates (DBC)

Aluminum Nitride Informative Web Sites:

Substrate Thinning

Applications Requiring Substrate, Wafer and Die Thinning:

  • Thinned compound semiconductor devices
  • Electro-optical devices
  • Bumped wafers
  • Thin multi-chip modules
  • Smart card electronics
  • Satellite/RPV microelectronics
  • Glass flat panel displays
  • Solar cells on glass
  • Light emitting diodes

Substrate Thinning Process

During ESD controlled proprietary thinning processes, the substrate edges, device topography and protrusions are protected. Depending on customer requirements, substrate, wafer and die thinning may involve:

  • Grinding
  • Lapping
  • CMP polishing
  • or some combination of the above processes

Please call or e-mail for a quotation to meet your specifications.

Ceramic Substrates

As part of the semiconductor substrate manufacturing process, dicing saws are used to singulate and cut small dies out of a larger finished wafer or substrate. These die are then utilized by our OEM customers in semiconductor packages, and various types of electronic components and devices for optical device applications such as communications. High Temperature Co-Fired Ceramics such as Alumina and Aluminum Nitride (HTCC) offer superior heat tolerance, humidity resistance and heat dispersion and excel in high-frequency characteristics. Thus they are used in applications which require environmental resistance, or high-frequencies, such as communications equipment.

Valley utilizes K&S and DISCO fully automatic, programmable dicing saws for dicing ceramics, as well as many other types of materials including Fused Silica and Quartz, Glass of all types, Sapphire, Silicon, metals and many others. In conjunction with our 4 and 5 axis CNC capabilities, many shapes and features can be machined such as pockets, cavities, slots, channels, chamfers, through-holes, radii and steps, all with tight tolerances. We also have the capability to machine domes.

These capabilities enable you to better handle production pressures and meet the requirements for kerf, chip specifications, and delivery. Depending upon the material, the dicing kerf may be as small as .001”. Various types of dicing blades can be used which have different grit sizes, bond types such as metal or resin, and different profiles. There are also many size and thickness options when choosing dicing blades.

For a complete summary of Valley Design’s dicing capabilities, click here.

Precision Machined

Precision machined ceramics capabilities include:

  • Surface grinding
  • Blanchard grinding
  • Lapping
  • Polishing
  • Slicing
  • Dicing
  • Internal grinding
  • External grinding
  • Jig grinding
  • Annealing
  • Lasering
  • Thinning
  • Wafering
  • Sawing
  • Chamfering
  • Drilling
  • Edge polishing
  • Shaping
  • Tumbling

Related Web sites:

www.sapphirewafers.com – Sapphire wafers and substrates
www.customdicing.com – Dicing ultra-hard materials
www.ceramicsubstrates.com/technical-ceramics – Advanced technical ceramics
www.ceramicsubstrates.com/aluminum-nitride – Aluminum nitride AlN ceramics

Technical Ceramics

Technical ceramics are produced by mixing raw materials such as alumina, silica and dozens of other compounds and then sintered or heated in a controlled atmosphere, high temperature furnace until mixture becomes hard.

Variables in manufacturing specific ceramics products include different proportions of ingredients, sintering methods at various temperatures, heating duration and other procedures.

The final ceramics products have different properties of hardness, thickness, heat resistance and other numerous properties depending on the various elements of the process used.

Large Sheets of ceramics can be made to match specific requirements.

Some of the different materials available include:

  • Silicon Carbide
  • Cordierite
  • Steatite
  • Alumina
  • Aluminum Nitride
  • Sapphire
  • Fused Silica
  • Spinel
  • Mullite
  • Aluminum Oxynitride – AlON

Steps for Custom Technical Engineered Ceramics Parts:

  • Choosing the right composition
  • Choosing the right design
  • Choosing the right finishing options

Related ceramic information:

www.ceramicsubstrates.com/aluminum-nitride – Aluminum nitride AlN ceramics
www.ceramicsubstrates.com/precision-machined – Precision machined ceramics
www.acers.org – American Ceramic Society

Ceramic Substrates

Request technical information or a quotation for:

Ceramic Substrate Requirements

  • Electronic ceramic substrates
  • Hybrid circuit ceramic substrates
  • Thin film ceramic substrates 99.6% Alumina up to 300mm diameter and 12″ square
  • Thick film ceramic substrates 96% Alumina
  • Super flat ceramic substrates

Ceramic Requirements:

  • Technical ceramics
  • Industrial ceramics
  • Custom ceramics
  • Alumina ceramics
  • Glass ceramics
  • Porous ceramics

30 year experience and strategic alliances with ceramic and ceramic substrate manufacturers, assures that East and West coast facilities can satisfy your critical and tight tolerance aluminum oxide and aluminum nitride ceramic needs.

Related ceramic information:

www.ceramicsubstrates.com/aluminum-nitride – Aluminum nitride AlN ceramics and ceramic substrates
www.ceramicsubstrates.com/technical-ceramics – Advanced technical ceramics
www.ceramicsubstrates.com/precision-machined – Precision machined ceramics and ceramic substrates
www.acers.org – American Ceramic Society

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