Patent ID: 7713825

Claim:
A method for forming a double diffused region of a laterally diffused metal oxide semiconductor (LDMOS) transistor, comprising: forming a patterned photoresist layer over a semiconductor substrate without hard baking; forming a first doped region by implanting a first boron-containing species into a region of the semiconductor substrate through the non-hard baked patterned photoresist layer at an implant energy of 300 KeV or greater in a high energy tool; following forming the first doped region, forming a second doped region by implanting a second boron-containing species into the semiconductor substrate region through the non-hard baked patterned photoresist layer at an implant energy of 200 KeV or less in a reduced energy tool; wherein the second doped region is shallower than the first doped region and wherein the energy used to form the first doped region functions to cure the non-hard baked patterned photoresist layer prior to forming the second doped region to reduce outgassing during implanting the second boron-containing species; forming a third doped region by implanting an arsenic-containing species into the semiconductor region through each opening of the patterned photoresist layer in a reduced energy tool; and thermally annealing the semiconductor.