Patent ID: 8237134
Filing Date: 2012-08-07
Classification: F17C,H01J,H01L,Y02E,Y10T

Abstract:
1. An ion implantation process, comprising: flowing a dopant composition to an ion source; generating ionic dopant species from the dopant composition at the ion source; and implanting the ionic dopant species in a substrate, wherein the dopant composition is selected from the group consisting of the following dopant compositions (i) and (ii): (i) dopant compositions comprising one or more germanium compounds isotopically enriched to above natural abundance level of at least one germanium isotope of mass 70, 72, 73, 74 or 76, wherein the isotopically enriched level of said at least one germanium isotope is greater than 21.2% for mass 70 germanium isotope, greater than 27.3% for mass 72 germanium isotope, greater than 7.9% for mass 73 germanium isotope, greater than 37.1% for mass 74 germanium isotope, and greater than 7.4% for mass 76 germanium isotope; and (ii) dopant compositions comprising a dopant gas and a supplemental gas, wherein the supplemental gas includes at least one of a diluent gas and a co-species gas, and wherein at least one of the dopant gas and, when present, a co-species gas, is isotopically enriched; with the proviso that when the dopant composition of dopant composition (i) or isotopically enriched dopant gas or co-species gas of dopant composition (ii) consists of germanium tetrafluoride isotopically enriched in mass 72 germanium isotope, said isotopically enriched level is greater than 51.6% for the mass 72 germanium isotope.