4inch 6inch Germanium
Single Crystals Ge substrates Wafers,customized Ge optical lens
2inch 3inch 4inch P-type N-type Ge substrate Germanium Wafers
Germanium substrates
Application: germanium wafer used in production of semiconductor
device, infrared ray optical device, sinking material of solar
cell.
| Main Property Terms | | |
| Production Method | Czochralski method(CZ) | |
| Crystal Structure | Cube | |
| Lattice Constant | a=5.65754Å | |
| Density | 5.323g/cm3 | |
| Melting Point | 937.4℃ | |
| Doped material | None doped or Sb doped | Indium or Gallium Doped |
| Type | /N | P |
| Resistivity | >35Ωcm0.05Ωcm | 0.05~0.1Ωcm |
| EPD | <4×103⁄cm2<4×103⁄cm2 | <4×103⁄cm2 |
| Size | 10x3,10x5,10x10,15x15,,20x15,20x20, | |
| dia2”x0.33mmdia2”x0.43mm15x15mm |
| Thickness | 0.5mm,1.0mm |
| Polishing | Single face or double face |
| Orientation | <100>,<110>,<111>,±0.5º |
| Crystal face Directional Accuracy | ±0.5° |
| Edge Directional Accuracy | 2°(Special request could be customized under 1°) |
| Bevel Shearing Directional Accuracy | Customized by special request, process edge direction by special
angle (inclination 1°-45°)of wafer |
| Ra: | ≤5Å(5µm×5µm) |
| Package | 100 Grade Cleaning Bag,1000Grade Super Cleaning Room |
Germanium (Ge) is the preferred lens and window material for high
performance infrared imaging systems in the 8–12 um wavelength
band. Its high refractive index makes Ge ideal for low power
imaging systems because of minimum surface curvature. Chromatic
aberration is small, often eliminating the need for correction.
Due to its high Knoop hardness, germanium is often used in infrared
systems that require a higher degree of hardness. Because of its
high refractive index, we usually coat germanium with
antireflection coating. The common wavebands are 3~12um or 8~12um.
After germanium is heated, its transmissivity will decrease with
the increase of temperature. Strictly speaking, germanium is best
used in an environment where the temperature is below 100 ℃. When
it is used in a system that is sensitive to weight requirements, it
is recommended that designers take into account the high-density
characteristics of germanium.
The ratio of lens size to thickness shall meet the processing
proportion, and the weight shall meet the design requirements.
The diameter range of germanium lenses and windows produced by our
company is 5~260mm, the surface accuracy can reach 20/10, and the
surface flatness can reach: λ/ 10@633nm (The ratio of lens
thickness to diameter shall conform to the processing proportion).
we can process and customize various germanium chips, germanium
windows and germanium plane mirrors for you
Application as window, lens, beamsplitter, ATR prism or filter in
spectrometers and in thermal imaging.
| Products Feature For Optical Ge lens |
| applications: | infrared optical lens | Absorptivity | ≤0.03 |
| diameter(mm) : | 12mm-380mm | Modulus of rupture | ≥75 |
| length(mm): | customized | Hardness(kg/cm2): | 800 |
| resistance : | 1-50Ω, ≥50Ω | Density(g/cm3): | 5.33 |
| : | 10% | Young modulus(Gpa): | 103 |
| orientation: | 111 | Poisson's ratio: | 0.28 |
off orientation: | 0.5º | Thermal conductivity(Wm-1k-1): | 59 |
| type: | N type | thermal expansivity | 6.1 |
| refractive index(10µm): | 4.0026 | Specific heatCal/(g.k): | 0.074 |
| <1×10ˉ4 | Melting point(℃): | 937 |
thermal refractive index coefficient (10.6µm,10ˉ6/℃ˉ1): | 400 | Dielectric constant | permittivity:16 | 16 |
| Optical windows finished products |
Ge wafer for optical grade:
| SL.No | Material Specifications: | |
| 1 | Crystalline Form : | Polycrystalline |
| 2 | Conductivity Type : | n-type |
| 3 | Absorption Coefficient, at 25°C | 0.035cm-1 max @10.6µm |
| 4 | Typical Resistivity : | 3-40 ohm-cm |
| 5 | size | dia1-150mmxthickness0.5-20mm |
| 6 | Mohs Hardness : | 6.3 |
| 7 | Oxygen Content : | < 0.03 ppm |
| 8 | Holes and Inclusions: | <0.05 mm |
| 9 | surface | lapped/1sp/2sp |
| 10 | S/D | 40/20,20/10,60/40,80/50, |
| 11 | Flatness | 1/4~1/10lambda |
FAQ:
Q: What's your MOQ?
A: (1) For inventory, the MOQ is 3pcs.
(2) For customized products, the MOQ is 25pcs up.
Q: What's the delivery time?
A: (1) For the standard products
For inventory: the delivery is 5 workdays after you place the
order.
For customized products: the delivery is 2 or 3 weeks after you
place the order.
(2) For the special-shaped products, the delivery is 4 workweeks
after you place the order.
Q: how is the way of shipping and cost?
A:(1) We accept DHL, Fedex, EMS etc by 100％ in advance before
delivery.
(2) If you have your own express account, it's great.If not,we
could help you ship them.
Freight is in accordance with the actual settlement.
Q: Can I customize the products based on my need?
A: Yes, we can customize the material, specifications for your
optical components
based on your needs.
