4inch 6inch Germanium Single Crystals Ge substrates Wafers,customized Ge optical lens 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 >35