Patent ID: 8610201

Claim:
A semiconductor device comprising: a plurality of fin field effect transistors (finFET) structures, the plurality of finFET structures comprising: a first finFET in the plurality of finFET structures comprising a first fin, the first fin further comprising: a first silicon (Si) layer comprising group III dopant; a first carbon-doped Si layer formed on the first Si layer; a second Si layer formed on the first carbon-doped Si layer, wherein the second Si layer comprising group III dopant diffused from the first Si layer, the volume of group III dopant diffused into the second Si layer is a function of dopant diffusion control by the first carbon-doped Si layer; and a second finFET in the plurality of finFET structures comprising a second fin, the second fin further comprising: a third Si layer comprising a group V dopant and a group III dopant; a second carbon-doped Si layer formed on the third Si layer; a fourth Si layer formed on the second carbon-doped Si layer, wherein the fourth Si layer comprising group V dopant and group III diffused from the third Si layer, the respective volume of group V dopant and group III dopant diffused into the fourth Si layer is a function of dopant diffusion control by the second carbon-doped Si layer.