Patent ID: 8298925

Claim:
A method of doping shallow lightly doped source and drain (LDD) regions of fin structures on a substrate, comprising: applying a first doping plasma on the shallow LDD regions of the fin structures, wherein the fin structures have surfaces with more than one crystalline orientation, wherein a first source gas of the first doping plasma includes a first dopant-containing gas and a first carrier gas, wherein the first dopant-containing gas includes the dopant, wherein the doping rate of the first doping plasma is significantly the same on different surfaces of the fin structures with more than one crystalline orientation; and applying a second doping plasma on the shallow LDD regions of the fin structures after the first doping plasma is applied; wherein a second source gas of the second doping plasma includes a second dopant-containing gas and a second carrier gas, wherein the second doping plasma delivers the dopant deeper below surfaces of the shallow LDD regions of the fin structures.