Germanium is an indirect semiconductor and it has a face centered cubic crystal lattice structure of diamond type with a lattice constant of a=5.657 Ǻ. 

Germanium is a typical semiconductor carrying a specific resistance of 500 cm at room temperature. 

Application of Germanium sputter targets:

Optical coatings: Germanium targets can be used to prepare coatings with specific optical properties, such as anti-reflective coatings and reflector coatings. 

These coatings have important applications in optical devices, lasers, fibre optic communications and other fields.

Solar cells: germanium targets are also used in the preparation of solar cells. 

Germanium material has a high light absorption coefficient and good photoelectric conversion efficiency,

and can be used as the absorption layer material for solar cells.

Semiconductor materials: metallic germanium is an important semiconductor material, which can be used to manufacture semiconductor devices, 

such as diodes and transistors. It has high electrical conductivity and good thermal conductivity, so it is widely used in electronic and optoelectronic devices.

Infrared Optical Devices: Metallic germanium plays an important role in the preparation of infrared optical devices. 

It has high refractive index and transmittance, and good transparency in the infrared spectral range, 

so it can be used to manufacture infrared windows, lenses, mirrors, etc.