Patent ID: 7202146

Claim:
A process for producing doped semiconductor wafers with a thermal conductivity k from silicon, which contain an electrically active dopant, and are further doped with germanium in a concentration of up to 2×10 20 atoms/cm 3 , comprising producing a single crystal from silicon and further processing said single crystal to form seimconductor wafers, and setting the thermal conductivity k in accordance with the formula k =(1−5.6×10 −21 x c (Ge)+1.4×10 −41 x c (Ge) 2 )/6.8×10 −3 +alpha x c (Dop)) by selecting the concentrations of germanium and of the electrically active dopant, in which formula k is the thermal conductivity at 22° C. in W/mK, c(Ge) and c(Dop) are the selected concentrations of germanium and of the electrically active dopant, respectively, in atoms/cm 3 , and alpha is a coefficient which has the following values depending on the electrically active dopant: Dopant: Boron Phosphorus Arsenic Antimony alpha: 9.57 · 10 −23 6.42 · 10 −23 2.11 · 10 −22 1.30 · 10 −21 .