We are doing physical vapor deposition with a wide range of materials, metals, insulators, and dielectrics. Would you happen to know the best sapphire orientation for depositing these types of materials? I am also trying to understand what exactly the “C-M plane 0.2 deg” description means for the 50.8mm sapphire wafers you have listed. Would these suffice for depositing these materials?
Sapphire Wafers for Physical Vapor Deposition
UniversityWafer, Inc. supplies sapphire wafers for physical vapor deposition of metals, insulators, dielectrics, optical coatings, and thin-film research materials.
An electro-optical engineer requested sapphire substrates for PVD with the following question:
UniversityWafer, Inc. quoted:
C-Plane (0001) sapphire with a 0.2° miscut toward the M-axis can be used for physical vapor deposition applications involving metals, insulators, and dielectric materials. The “C-M plane 0.2 deg” description means the C-plane sapphire surface has a small off-cut, or tilt, of approximately 0.2 ± 0.1 degrees toward the M-axis.
Reference #266321 for sapphire wafer specs and pricing.
Silicon Pellets for PVD and E-Beam Evaporation
In addition to wafer substrates, researchers also use silicon pellets as source material in PVD systems, including e-beam evaporation tools.
A PhD candidate requested the following silicon source materials:
Do you sell Si as pellets? I do not want wafers. I want pellets so I can use them as source material for physical vapor deposition in an e-beam based system. We are looking for silicon pellets that are undoped, n-type, and p-type at different doping levels.
- Undoped silicon pellets
- P-type heavily doped silicon pellets
- P-type medium doped silicon pellets
- P-type low doped silicon pellets
- N-type heavily doped silicon pellets
- N-type medium doped silicon pellets
- N-type low doped silicon pellets
Reference #255944 for silicon pellet specs and pricing.
Request PVD Substrates and Source Materials
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What is Physical Vapor Deposition (PVD)?
Physical Vapor Deposition, often called PVD, is a vacuum-based thin-film deposition process used to coat wafers, substrates, optics, devices, and research samples with metals, dielectrics, semiconductors, and other materials.
During PVD, the source material is converted into a vapor by evaporation, sputtering, or another physical process. The vapor then travels through a vacuum chamber and condenses onto the substrate surface, forming a thin, uniform film.
PVD is widely used when researchers need controlled film thickness, clean deposition conditions, good adhesion, and high-quality coatings for microelectronics, optics, sensors, solar cells, MEMS, and materials research.
Common PVD Processes
Several deposition methods fall under the PVD category. The best process depends on the material being deposited, the required film thickness, and the final application.
- Thermal evaporation: Source material is heated until it evaporates and deposits onto the substrate.
- E-beam evaporation: An electron beam heats the source material, making it useful for high-melting-point materials.
- Sputtering: Energetic ions strike a target material, ejecting atoms that deposit as a thin film.
- Ion plating: Combines vapor deposition with ion bombardment to improve coating density and adhesion.
What Substrates are Used for PVD?
PVD can be performed on many substrate materials. Substrate choice depends on thermal stability, surface finish, crystal orientation, electrical properties, and the coating material being deposited.
- Silicon wafers: Commonly used for microelectronics, MEMS, sensors, solar cells, and semiconductor research.
- Sapphire wafers: Used for optical, high-temperature, RF, LED, and dielectric coating applications.
- Fused silica and glass substrates: Used for optical coatings, displays, windows, and transparent thin-film devices.
- Quartz substrates: Used when optical transparency, thermal stability, or electrical insulation is required.
- Silicon carbide wafers: Used for high-temperature, power device, and harsh-environment applications.
- Metal and ceramic substrates: Used for protective coatings, wear-resistant films, and surface engineering research.
Why Surface Quality Matters
The quality of the substrate surface can strongly affect the final PVD coating. Flatness, roughness, cleanliness, polish, and wafer orientation may influence film adhesion, uniformity, stress, and electrical or optical performance.
For many research projects, polished wafers are preferred because they provide a smooth and consistent surface for thin-film growth. Sapphire, silicon, quartz, and glass substrates are often selected when researchers need repeatable deposition results.
PVD Applications
Physical Vapor Deposition is used across many research and industrial fields, including:
- Microelectronics: Thin films for contacts, electrodes, interconnects, transistors, and semiconductor devices.
- Optics: Reflective, anti-reflective, filter, and protective coatings on glass, sapphire, quartz, and lenses.
- Materials science: Experimental films, multilayers, alloys, and new coating materials.
- Energy research: Thin films for solar cells, batteries, photovoltaic devices, and conductive coatings.
- MEMS and sensors: Functional coatings for microsensors, actuators, and device fabrication.
- Surface engineering: Protective, decorative, corrosion-resistant, and wear-resistant coatings.
UniversityWafer, Inc. supplies wafers, substrates, and source materials used in PVD research, including sapphire wafers, silicon wafers, quartz, fused silica, glass, silicon carbide, and silicon pellets.