Delta-doped Si(100):Sb superlattices with period varying from 1.5 to 1
00 nm have been characterized by resistivity and Hall-effect measureme
nts. Extremely high mean electron concentrations up to 8 x 10(20) cm-3
and electron mobilities exceeding the values for uniformly-doped bulk
Si by a factor of about two have been achieved in short-period superl
attices.