A novel CMOS VLSI isolation technology using selective chlorine implantation

An isolation technology that uses blanket boron and selective chlorine n-well implantation prior to field oxidation is proposed. Chlorine implantation results in an increase in the thermal-oxidation linear-reaction-rate coefficient by a factor of 11.5, which enhances the segregation of dopant atoms in the n-well field region. Due to the redistribution of dopant atoms in the n-well field region, the field threshold voltage magnitude may be increased by as much as 20 V when chlorine implantation is used.<>