Compound Semiconductor Wafers & Substrates
Compound semiconductor wafers and substrates are the crystal foundations used in optoelectronics, RF and microwave devices, high-frequency communications, power electronics, LEDs, lasers, detectors, sensors, and advanced thin-film research. Compared with conventional silicon, compound semiconductor materials can offer direct band gaps, high electron mobility, wide band gaps, high breakdown strength, excellent thermal stability, and specialized optical or lattice-matching properties.
This category brings together compound semiconductor wafers, single-crystal substrates, wide-bandgap substrates, optical and lattice-matched crystals, epi-ready platforms, templates, and research-size pieces. Products can be selected by material system, crystal orientation, wafer diameter, thickness, conductivity, resistivity, surface finish, and intended process.
Show More: Compound Semiconductor Materials and Substrate Types
Choose by Material and Application
| Material Family | Common Applications | Key Selection Points |
|---|---|---|
| Gallium Arsenide (GaAs) | RF and microwave devices, high-speed electronics, infrared and optoelectronic components, solar cells | Semi-insulating or conductive grade, orientation, dopant, resistivity, diameter, thickness, and polish |
| Indium Phosphide (InP) | Fiber-optic communication, lasers, photodetectors, high-speed and photonic integrated devices | Orientation, carrier type, resistivity, wafer size, epi-ready surface, thickness, and flatness |
| Gallium Nitride (GaN) | RF power, high-frequency electronics, LEDs, laser diodes, and wide-bandgap devices | Substrate type, crystal orientation, off-cut, bow, warp, defect level, and surface condition |
| Silicon Carbide (SiC) | High-voltage and high-temperature power devices, RF electronics, and harsh-environment applications | Polytype such as 4H, conductivity, off-cut angle, micropipe and defect data, and epi-readiness |
| Gallium Phosphide (GaP) and Other III-V Materials | Optoelectronics, LEDs, photonics, and specialized compound devices | Composition, orientation, conductivity, lattice matching, surface finish, and wafer format |
| Sapphire (Single-Crystal Al2O3) | LED and GaN growth platforms, optical devices, insulating substrates, and high-temperature processes | Crystal cut, orientation, diameter, single- or double-side polish, flatness, and optical grade |
| Zinc Oxide (ZnO) | Transparent electronics, sensors, piezoelectric devices, UV, and oxide thin-film research | Orientation, purity, conductivity, surface polish, dimensions, and film compatibility |
| Lanthanum Aluminate (LaAlO3) and Other Oxide Crystals | Lattice-matched oxide films, superconducting-film research, dielectric and functional-material studies | Crystal structure, orientation, lattice match, thermal expansion, thickness, and surface quality |
Select the Right Product Form
| Product Form | Suitable Applications | Selection Points |
|---|---|---|
| Full Wafer | Wafer-level deposition, lithography, epitaxy, device fabrication, and repeatable process development | Diameter, notch or flat, thickness, TTV, bow, warp, edge exclusion, and packaging |
| Epi-Ready Substrate | Epitaxial growth or high-quality thin-film deposition requiring a controlled surface | Roughness, cleaning, particle level, surface defects, orientation, and inspection standard |
| Research-Size Piece or Diced Substrate | Material screening, laboratory experiments, microscopy, prototyping, and low-volume development | Length and width, thickness, cut direction, polish, edge treatment, and quantity |
| Template or Layered Substrate | Structures requiring a buffer layer, seed layer, bonded layer, or heterostructure | Layer material, layer thickness, interface, strain, bonding method, and surface condition |
| Custom Wafer or Engineered Geometry | Applications where standard formats do not fit the equipment or device design | Drawing, tolerance, holes or slots, edge profile, polish, quantity, and inspection requirements |
Specifications That Matter in Real Use
- Material and crystal: Chemical composition, purity, crystal structure, polytype, orientation, off-cut angle, and lattice-matching relationship.
- Electrical properties: Semi-insulating or conductive grade, carrier type, dopant, resistivity, mobility, and dielectric behavior where relevant.
- Geometry: Wafer diameter or piece dimensions, thickness, tolerance, flatness, total thickness variation, bow, warp, notch, flat, and edge exclusion.
- Surface condition: Single- or double-side polish, roughness, scratches, pits, particles, cleaning state, and epi-ready or research-grade finish.
- Quality and handling: Defect information, inspection data, protective packaging, individual or bulk packing, and certificate or traceability requirements.
Match the Substrate to the Process
| If Your Priority Is… | Start by Comparing… | Also Confirm… |
|---|---|---|
| RF, Microwave, or High-Frequency Performance | Semi-insulating GaAs, high-quality InP, GaN, and SiC platforms | Resistivity, dielectric loss, orientation, surface roughness, and wafer flatness |
| Photonics, Lasers, or Optical Detection | InP, GaAs, GaP, sapphire, and selected oxide crystals | Wavelength range, crystal cut, optical quality, polish, and thickness |
| High-Voltage or High-Temperature Power Devices | 4H-SiC, GaN platforms, and other wide-bandgap substrates | Polytype, conductivity, defect density, thermal expansion, bow, and warp |
| LED or Nitride Epitaxy | Sapphire, SiC, and GaN templates | Orientation, buffer compatibility, surface morphology, and epi-ready condition |
| Oxide Thin Films or Superconducting Films | LaAlO3 and other lattice-matched single-crystal substrates | Lattice match, thermal expansion, orientation, surface preparation, and deposition temperature |
| Early-Stage Material Screening | Research-size pieces and standard small substrates | Available dimensions, polish, packaging, repeatability, and sample quantity |
Orientation, Polish, and Size
Crystal orientation affects lattice matching, growth behavior, etching, polarization, and device performance. Common orientation notation includes (0001), (001), (110), and (111), but the correct choice depends on the material system and process. Single-side polished substrates are often suitable when deposition occurs on one face; double-side polished substrates can be preferable for optical inspection, alignment, backside processing, bonding, or precise metrology.
Wafer diameter and thickness should match the equipment, chuck, mask, carrier, and handling system. Smaller round wafers and square pieces are convenient for research and prototyping, while larger standardized wafers support more repeatable process development. When a standard size is unsuitable, custom dicing, edge treatment, thickness, or geometry can be evaluated from a drawing and process description.
Frequently Asked Questions
What are compound semiconductor wafers used for?
They are used as the starting platform for epitaxy, thin-film deposition, lithography, device fabrication, optical testing, RF development, power electronics, LEDs, lasers, detectors, and semiconductor materials research.
How do I choose between GaAs, InP, GaN, and SiC?
Choose according to the target device and operating conditions. GaAs and InP are widely used for high-frequency and photonic applications; GaN and SiC are common choices for wide-bandgap, high-power, high-temperature, or high-frequency development. The final choice should also consider orientation, conductivity, thermal expansion, defect requirements, and the next process step.
What is the difference between a wafer and a substrate?
A wafer usually refers to a standardized round or square crystal format prepared for wafer-level processing. A substrate emphasizes the supporting crystal platform used for epitaxy, deposition, measurement, or device fabrication. In practice, the terms can overlap, so confirm the dimensions, surface grade, and whether any epitaxial or buffer layer is included.
What does epi-ready mean?
Epi-ready means that the surface has been prepared for epitaxial growth according to a stated or agreed quality level. Ask for roughness, flatness, particle and defect criteria, cleaning condition, orientation, and inspection information because the exact meaning varies by material and supplier.
Which crystal orientation should I select?
Use the orientation specified by the target film, device design, or process literature. Orientation can influence lattice matching, growth mode, polarization, etching, and surface behavior. If the process is still under development, compare the available orientations with the intended deposition method and film system before ordering.
Should I choose single-side or double-side polishing?
Single-side polish is generally suitable when only the front surface is used for deposition or fabrication. Double-side polish may be useful for optical transmission, alignment, backside processing, bonding, or metrology. Consider the equipment, handling method, and surface requirements of both sides.
What wafer size and thickness should I buy?
Select a format that fits the chuck, carrier, mask, reactor, and handling tools. Thickness affects mechanical strength, thermal behavior, optical path, and process compatibility. For a new experiment, confirm the usable area, edge exclusion, flatness, bow, warp, and thickness tolerance rather than choosing by diameter alone.
Can I order diced pieces or non-standard sizes?
Many research and prototype applications use diced pieces or custom geometries. Provide the material, orientation, dimensions, thickness, tolerance, edge treatment, polish, quantity, and any drawing or packaging requirement so the format can be matched to your experiment.
What information should be included in an inquiry?
Please specify the material or material family, wafer or piece format, diameter or dimensions, thickness, orientation or off-cut, conductivity or resistivity, polish, epi-ready requirement, quantity, packaging, and intended application. For epitaxy or thin-film work, also include the deposition method, temperature range, target film, and any lattice-matching or defect requirements.
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