Influence of crystal structure on the electrical conductivity of semiconducting germanium

The correlation of the electrical conductivity and structure of polycrystalline semiconductor optical germanium (SOGe) and high-pure germanium (HPGe) is established. The conductivity of SOGe is reduced with decrease of grain size, that is connected to decrease of carrier mobility, as result of dispersion on crystallites boundaries. The conductivity of HPGe is increased with reduced grain size, following increased electronic surface states concentration.