Determination of carrier mobility vs resistivity relation in Czochralski-grown n- and p-type Si _xGe _1-x (0.93 < x < 0.96) single crystals

Undoped and impurity-doped single crystals of Si _x Ge _1-x with the composition 0.93 < x < 0.96 were grown by the Czochralski technique. The Hall electron and hole mobilities in undoped or lightly impurity-doped SiGe were somewhat lower than those in Si, while in heavily impurity-doped SiGe were comparable to those in Si. The alloy disordered scattering and charged impurity scattering may govern the carrier transport process in undoped or lightly impurity-doped SiGe and in heavily impurity-doped SiGe, respectively. The so-called Irvin's curve of the practical relation between resistivity and carrier concentration was obtained for SiGe with the composition 0.93 < x < 1.