High Purity Germanium Crystals

The Czochralski crystal-growth method is mainly used for silicon-based electronics and solar energy applications. Umicore has further refined this method in order to make it work for germanium.

Umicore created the world’s purest germanium crystal. With a purity of 99.99999999999% it is used to detect and analyse gamma rays in particle accelerators, nuclear power plants and space applications, such as the Gamma Ray Spectrometer on the Mars Odyssey spacecraft. In 2003 this instrument discovered huge amounts of water across vast areas of Mars. Today, ultrapure germanium crystals are being used to build a giant instrument to detect dark matter in our universe. Umicore continues to innovate and develop its germanium-crystal production technology. This has enabled us to maintain our leadership in germanium substrates for space applications. 


Product highlights:

The crystals are Czochralski grown in the (100) crystallographic direction. The outer crystal surface is as grown or cylindrically ground (surface roughness max 2,5 μm RMS). The crystal soundness is checked by infrared thermography.

  • Transport properties - Hall mobility μH
    • p-type μH ≥ 10 000 cm2/V.s (Center measurement)
    • n-type μH ≥ 10 000 cm2/V.s (Center measurement)
  • Deep levels (measured by DLTS)
    • p-type : Cutot ≤ 4,5 109 cm-3
    • n-type : Deep level point defects < 5 108 cm-3
  • Crystallographic perfection:
  p-type n-type
Dislocation density (EPD, cm2)  ≤ 10 000  ≤ 5 000 
Lineage (unit length = slice radius)  ≤ 3  ≤ 2
Mosaic structures (unit surface = 10 mm2)  ≤ 5  ≤ 2
Saucers (cm2)  ≤ 500  ≤ 500



We use cookies on our website. To learn more about cookies, how we use them, and how to change your cookie settings, please read our Terms of Use and Privacy and Cookie Policy. By accepting, you consent to the Terms and the Policy.

Necessary Cookies
Necessary Cookies are Cookies that are required for the Website to operate as intended by Umicore. Necessary Cookies do not identify you as an individual and, if you do not accept them, then some features of the Website may not function properly.
Analytical Cookies
Analytical Cookies are Cookies that help Umicore improve the Website by collecting User Data. Analytical Cookies do not identify you as an individual and all User Data that is collected by Analytical Cookies is aggregated and anonymous.