2001 Volume 42 Issue 6 Pages 1024-1027
B-doped (p-type) and P-doped (n-type) Ge0.07Si0.93 single crystals were prepared by a Czochralski (CZ) method. The anisotropy of Seebeck coefficient (α), electrical conductivity (σ) and thermal conductivity (κ) among the ,  and  directions was determined and the values were compared with those of polycrystalline materials. The Seebeck coefficient of B-doped specimen in the  direction (α111) was the same as that in the  direction (α110), and was greater than that in the  direction (α001) measured at all temperature. The α111, α110 and α100 of the P-doped specimens were in agreement above 600 K, but anisotropy of α values was observed below 500 K, (|α001|>|α111|>|α110|). No anisotropy of σ and κ was observed in both B- and P-doped specimens. The thermal conductivity of B- and P-doped single crystal specimens were much greater than that of polycrystalline materials.