Germanium Wafers for Infrared Optics, Photonics & Semiconductor Research 

UniversityWafer supplies high-quality germanium wafers (Ge wafers) for infrared optics, photonics, semiconductor devices, solar cells, radiation detectors, and advanced research. We offer optical-grade and electrical-grade germanium substrates in a variety of diameters, crystal orientations, doping types, thicknesses, and polished finishes to meet the requirements of universities, research laboratories, and commercial semiconductor manufacturers. Whether you need standard specifications or custom germanium wafers, our technical team can provide fast quotes and worldwide delivery.

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Custom Germanium Wafers for Research and Device Development

UniversityWafer supplies germanium wafers (Ge wafers) for universities, research laboratories, aerospace and defense research, photonics, detector development, and semiconductor applications. Germanium substrates can be selected according to crystal orientation, conductivity type, resistivity, thickness, diameter, surface finish, and intended use.

Because optical, electronic, photovoltaic, and detector applications can require very different material properties, the most suitable germanium wafer depends on the specific device or experiment. Providing detailed specifications with your request helps identify the best substrate for your application.

Typical Germanium Wafer Specifications

  • Material grade: optical-grade or electrical-grade germanium
  • Crystal orientation: commonly <100>, <111>, or specialized orientations
  • Conductivity type: P-type, N-type, or high-resistivity / nominally intrinsic material
  • Electrical specification: resistivity or dopant concentration as required
  • Surface finish: single-side polished (SSP) or double-side polished (DSP)
  • Dimensions: custom diameter and thickness requirements
  • Surface quality: polishing, roughness, and finish requirements depending on application
  • Quantity: research quantities through larger-volume orders

What Information Should You Include in a Germanium Wafer Request?

For the fastest and most accurate quote, include as many of the following specifications as possible:

  • Wafer diameter
  • Wafer thickness
  • Crystal orientation
  • P-type, N-type, or high-resistivity material
  • Required resistivity or dopant concentration
  • Single-side or double-side polish
  • Surface roughness or optical finish requirements
  • Quantity required
  • Intended application or process

Germanium Wafers for Optical Applications

For infrared optical work, important specifications may include surface polish, optical quality, wafer thickness, diameter, flatness, and the wavelength range of interest. Optical performance can vary with material quality, wavelength, temperature, surface condition, and any coating applied to the finished optic.

Germanium Wafers for Semiconductor Research

Electronic and semiconductor applications may require tighter control of crystal orientation, resistivity, conductivity type, surface preparation, and dimensional tolerances. These parameters can influence epitaxy, interface formation, device fabrication, and electrical characterization.

Germanium Wafers for Epitaxy

Germanium substrates are used in selected epitaxial research, including work involving III-V materials and heterostructures. For epitaxial applications, crystal orientation, surface preparation, miscut requirements, polishing quality, and substrate cleanliness may be important to the growth process.

Germanium for Detector and Photonics Research

Germanium is used in photodetector, infrared, and photonics research because of its electronic and optical properties. However, detector requirements vary significantly between applications. For example, high-purity germanium used in radiation spectroscopy has much more specialized purity requirements than a standard semiconductor research wafer.

Common Germanium Wafer Applications

  • Infrared optics and thermal imaging research
  • Near-infrared photodetectors
  • Silicon photonics and Ge-on-Si research
  • III-V epitaxial growth and heterostructure research
  • Multi-junction photovoltaic devices
  • High-mobility semiconductor device research
  • Radiation detector material research
  • Surface science and semiconductor characterization

Request a Germanium Wafer Quote

Complete the form below with your required diameter, thickness, orientation, conductivity type, resistivity, polish, quantity, and application. If you are unsure which specification is appropriate, include information about your process or research objective so the available germanium substrate options can be evaluated.

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Why Choose Germanium Wafers?

Germanium (Ge) is a group IV semiconductor used in infrared optics, photonics, detectors, high-speed electronic research, and advanced photovoltaic devices. At room temperature, crystalline germanium has an indirect bandgap of approximately 0.66 eV, which is smaller than that of silicon. Germanium also has higher electron and hole mobilities than silicon, making it attractive for research involving high-speed and low-voltage semiconductor devices.

Optical-grade germanium is particularly important for mid-infrared optical applications because properly prepared germanium can provide useful transmission over a broad infrared wavelength range while also having a high refractive index. Electrical-grade material, meanwhile, can be selected by conductivity type, resistivity, crystal orientation, thickness, and surface finish for semiconductor and device research.

UniversityWafer supplies germanium wafers and Ge substrates for research, prototype development, optics, detectors, photovoltaics, and semiconductor processing. Available specifications may include custom diameters, orientations, doping types, resistivities, thicknesses, and single- or double-side polished surfaces.

Germanium wafer applications including infrared optics, photonics, detectors, solar cells and semiconductor research

Common Applications of Germanium Wafers

  • Infrared optics: windows, lenses, filters, and other components for selected mid-infrared systems
  • Thermal imaging: optical components used in infrared imaging and sensing systems
  • Photodetectors: germanium-based detection research, particularly at near-infrared telecommunications wavelengths
  • Silicon photonics: research involving germanium or Ge-on-Si structures for optical detection and integration
  • Multi-junction solar cells: germanium substrates used in high-efficiency III-V photovoltaic structures
  • Radiation detection: high-purity germanium materials used in gamma-ray and X-ray detector technologies
  • High-speed electronics: research into transistors and devices that benefit from germanium's high carrier mobility
  • Semiconductor research: epitaxy, heterostructures, surface studies, and device development

Germanium Wafer Properties

The properties that make germanium useful depend on the application. Optical systems typically emphasize infrared transmission, surface quality, thickness, and optical uniformity, while electronic applications may require tight control of resistivity, dopant type, orientation, and crystal quality.

Property Germanium Silicon
Indirect Bandgap at Room Temperature Approximately 0.66 eV Approximately 1.12 eV
Electron Mobility Higher than silicon Lower than germanium
Hole Mobility Higher than silicon Lower than germanium
Infrared Optical Use Widely used for selected near- and mid-infrared applications Useful in selected infrared wavelength ranges
Refractive Index High in the infrared Also high, but generally lower than germanium in comparable IR regions
Thermal Conductivity Lower than silicon Higher than germanium
Typical Research Uses IR optics, photodetectors, III-V solar cells, high-mobility devices Integrated circuits, MEMS, sensors, power devices, photonics

Optical-Grade vs. Electrical-Grade Germanium

Optical-Grade Germanium

Optical-grade germanium is selected for infrared applications where surface quality, optical transmission, thickness, and polishing are important. Depending on the optical system, substrates may be fabricated into windows, lenses, filters, or other infrared components. Anti-reflection coatings are often used in finished germanium optics because germanium has a high refractive index and therefore significant Fresnel reflection from an uncoated surface.

Electrical-Grade Germanium

Electrical-grade germanium is used in semiconductor and electronic research where properties such as conductivity type, dopant concentration, resistivity, crystal orientation, and surface preparation can influence device performance and processing results.

Germanium Wafer Crystal Orientations

Germanium wafers may be supplied in common crystallographic orientations such as <100> and <111>, with other orientations available for specialized research. Crystal orientation can affect epitaxial growth, surface chemistry, etching behavior, interface formation, and device fabrication.

P-Type, N-Type, and Intrinsic Germanium

Germanium substrates can be supplied as P-type, N-type, or high-resistivity / nominally intrinsic material, depending on the intended application. Dopant type and concentration determine electrical conductivity and should be selected according to the device structure, epitaxial process, detector design, or electrical measurements being performed.

Germanium for Infrared Optics

Germanium is widely used in infrared optical systems because of its favorable transmission in selected infrared wavelength regions and its high refractive index. Applications can include thermal imaging, infrared spectroscopy, sensing systems, and other IR optical assemblies.

Optical performance depends on the material grade, impurity content, surface finish, thickness, wavelength, operating temperature, and any applied optical coating. For this reason, the correct germanium specification should be selected for the intended optical band rather than assuming that all Ge substrates provide identical transmission.

Germanium for Photodetectors and Photonics

Germanium is important in photonics because it can absorb near-infrared wavelengths used in telecommunications and can be integrated with silicon-based platforms. Germanium and Ge-on-Si structures are therefore widely studied for photodetectors, optical receivers, and silicon photonic devices.

Bulk germanium wafers can also serve as research substrates for epitaxy, material characterization, detector development, and related photonic experiments.

Germanium Substrates for Multi-Junction Solar Cells

Germanium is commonly used as a substrate in high-efficiency III-V multi-junction solar cells. Its lattice constant is closely matched to materials such as GaAs, which makes it useful as a foundation for epitaxial III-V device structures. In some multi-junction designs, the germanium substrate can also contribute as the lowest-bandgap junction.

Available Germanium Wafer Specifications

Germanium substrates can be supplied in a range of configurations depending on the application. Important specifications may include:

  • Optical-grade or electrical-grade germanium
  • <100>, <111>, and specialized crystal orientations
  • P-type, N-type, or high-resistivity / nominally intrinsic material
  • Specified resistivity or dopant concentration
  • Single-side polished (SSP) or double-side polished (DSP) surfaces
  • Custom wafer diameters and thicknesses
  • Thickness tolerance and total thickness variation requirements
  • Surface roughness and polishing requirements
  • Research quantities through larger production orders

How to Select a Germanium Wafer

When requesting a germanium substrate, consider the requirements of the experiment or device before selecting the wafer specification.

  • Application: optical, electronic, photovoltaic, detector, or epitaxial research
  • Diameter: select a size compatible with your equipment and process
  • Thickness: consider mechanical strength, optical path length, and processing requirements
  • Orientation: choose the crystal plane required for epitaxy, etching, or device fabrication
  • Conductivity type: P-type, N-type, or high-resistivity material as required
  • Resistivity: specify the electrical range needed for the experiment
  • Surface finish: SSP or DSP depending on optical, bonding, epitaxial, or device requirements
  • Optical requirements: specify the wavelength range and surface quality for infrared applications

Custom Germanium Substrates

If your project requires a non-standard germanium wafer, UniversityWafer can help source substrates with application-specific specifications. Custom requirements may include diameter, orientation, thickness, resistivity, doping, polish, surface quality, and other dimensional or material parameters.

When requesting a quote, provide as much information as possible about the intended application and required specifications so the appropriate germanium substrate can be identified.

Related Germanium and Semiconductor Resources