Patent ID: 7262102

Claim:
A method of fabricating metal oxide semiconductor devices in parallel, the metal oxide semiconductor devices comprising a low voltage semiconductor device and a high voltage semiconductor device, wherein the low voltage and high voltage devices are separated by an insulation barrier, the method comprising: depositing on the semiconductor devices a dielectric comprising at least one dielectric layer that is in physical contact with the semiconductor devices; overlaying the low voltage semiconductor device with a first mask; preventing the insulation barrier adjacent the high voltage device from being removed; removing the dielectric from the high voltage semiconductor device where the first mask is not overlaid; removing the first mask; growing a first oxide layer on the high voltage semiconductor device; overlaying the high voltage semiconductor device with a second mask; preventing the insulation barrier adjacent the low voltage device from being removed; removing the dielectric from the low voltage semiconductor device where the second mask is not overlaid; removing the second mask; growing a second oxide layer on the low voltage semiconductor device and the high voltage semiconductor device; and exposing a trench in the insulation barrier to remove a hedge.