Patent ID: 7858479

Claim:
A method of manufacturing a semiconductor device, comprising the steps of: (a) forming a plurality of gate electrodes on a semiconductor substrate, the plurality of gate electrode have a first portion with a larger gate length and a second portion with a smaller gate length due to in-plane non-uniformity pattern size; (b) forming plasma and controlling a plasma density of the plasma over the plurality of gate electrodes so as to provide non-uniform plasma having higher different plasma densities over the plurality of gate electrodes, such that a plasma density over the first portion is higher than a plasma density over the second portion; and (c) doping the semiconductor substrate with impurities by a plasma doping process using the plurality of gate electrodes as a mask in the non-uniform plasma, wherein in the step (c), an amount of dopant doped by the plasma doping process in the first portion with a larger gate length is larger than an amount of dopants doped by the plasma doping process in the second portion with a smaller gate length.