Patent ID: 7846822

Claim:
A method for making a doped semiconductor, said method comprising: providing a semiconductor having an exposed surface; selecting a desired surface abundance of diffusion control groups on said exposed surface from the range of about 5×10 13 molecules cm −2 to about 2×10 15 molecules cm −2 or from the range of about 0.1 monolayer to about 3 monolayers, wherein said surface abundance of said diffusion control groups is selected so as to control rates of diffusion of dopants to achieve a selected dopant profile; treating said exposed surface of said semiconductor with a surface modifying agent, wherein interaction between said surface modifying agent and said semiconductor forms said diffusion control groups on the exposed surface; terminating said treating said exposed surface of said semiconductor with said surface modifying agent when said desired surface abundance of diffusion control groups on said exposed surface is reached; implanting the semiconductor with a dopant, thereby generating a semiconductor having implanted dopant; and annealing the semiconductor having implanted dopant and said desired surface abundance of diffusion control groups, thereby generating said doped semiconductor; and wherein said step of implanting the semiconductor with dopants is performed prior to said step of treating the exposed surface of the semiconductor with the surface modifying agent; and wherein said step of treating the exposed surface of said semiconductor with the surface modifying agent is performed prior to said step of annealing said semiconductor having implanted dopant.