Patent ID: 7453113

Claim:
A strained silicon channel for a vertical field effect transistor comprising: a substrate having a relaxed n-type Si 1-y Ge y (0≦y≦1) epitaxial region and said region having a doping concentration greater than 1×10 19 atoms/cm 3 ; a relaxed Si 1-a-b Ge a C b (0≦a≦1, 0≦b≦1) epitaxial region over said relaxed n-type Si 1-y Ge y epitaxial region; a p-type Si 1-z Ge z (0≦z≦1) epitaxial region over said relaxed Si 1-a-b Ge a C b epitaxial region; a relaxed Si 1-e-f Ge e C f ( 0≦e≦1, 0≦f≦1) epitaxial region over said p-type Si 1-z Ge z epitaxial region; a strained n-type silicon epitaxial region over said relaxed Si 1-e-f Ge e C f epitaxial region having a doping concentration greater than 1×10 19 atoms/cm 3 ; a vertical structure comprising at least one sidewall extending from said relaxed n-type Si 1-y Ge y epitaxial region, over said region of Si 1-a-b Ge a C b , over said second region of Si 1-z Ge z region, over said region of Si 1-e-f Ge e C f , and over said region of strained n-type silicon epitaxial region; a strained silicon epitaxial region over a region of said at least one sidewall of said vertical structure extending from said region of Si 1-a-b Ge a C b , over said region of Si 1-z Ge z region, to said region of Si 1-e-f Ge e C f ; a gate dielectric region over said strained silicon epitaxial region; a conducting region over said gate dielectric region; wherein said relaxed Si 1-a-b Ge a C b region is doped n-type in a range from 1×10 16 to 1×10 21 atoms/cm 3 ; a relaxed Si 1-h Ge h region over said strained n-type silicon epitaxial region, said Si 1-h Ge h doped n-type to a concentration level greater than 1×10 19 atoms/cm 3 , and wherein said vertical structure has at least one sidewall including a portion of said sidewall formed from said region of Si 1-h Ge h (0≦h≦1); and a relaxed Si 1-g Ge h (0≦g≦1) region over said strained silicon region extending from said region of Si 1-a-b Ge a C b , over said region of Si 1-z Ge z region, to said region of Si 1-e-f Ge e C f region; wherein said relaxed Si 1-e-f Ge e C f region is doped n-type in range from 1×10 16 to 1×10 21 atoms/cm 3 , wherein said strained silicon region is autodoped n-type in a region adjacent to said relaxed n-type Si 1-y Ge y epitaxial region and to said strained n-type silicon epitaxial region, while autodoped p-type in a region adjacent to said p-type Si 1-z Ge z epitaxial region, wherein said strained silicon region is grown to a thickness less than a critical thickness with respect to the lattice spacing of said relaxed SiGe region, wherein said region comprises poly silicon or poly SiGe.