Patent ID: 8778786

Claim:
A method for fabricating a structure comprising a portion of a plurality of semiconductor devices, the method comprising: providing a substrate having thereon a substantially flat surface comprising crystalline silicon having thereon at least one set of doped wells; providing a first protective layer on the substrate through which ion implantation steps are to be performed, the first protective layer comprising chemical oxide; isolating a first exposed area of a substrate using a first mask with the first protective layer directly over the first exposed area; implanting common dopants amenable for forming first device type elements through the first protective layer in the first exposed area; removing the first mask and the first protective layer from the substrate, removal of the first mask and the first protective layer causing a loss of silicon in the substrate; forming a second protective layer directly on the substrate through which ion implantation steps are to be performed; isolating a second exposed area using a second mask; implanting common dopants amenable for forming second device type elements through the second protective layer in the second exposed area; removing the second mask while minimizing removal of the second protective layer; removing the second protective layer.