Patent ID: 11923169
Assignee: AXCELIS TECHNOLOGIES, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An ion implantation system, comprising:
an ion source configured to generate desired ions of a desired species and trace metal ions of a contaminant species, wherein the desired ions of the desired species are at a first charge state, and wherein a charge-to-mass ratio of the desired ions and the trace metal ions is equal, wherein the desired ions comprise 75As 3+ ions and the trace metal ions comprise 50Ti2+ ions;
an extraction apparatus configured to extract the desired ions and the trace metal ions from the ion source to define a first ion beam;
a mass analyzer configured to select the desired ions and the trace metal ions from the first ion beam, thereby defining a mass analyzed ion beam;
an accelerator configured to accelerate the mass analyzed ion beam from a first energy to a second energy;
a charge stripping apparatus configured to strip at least one electron from the desired ions, thereby defining a second ion beam comprising the desired ions at a second charge state and the trace metal ions; and
a charge selector positioned downstream of the charge stripping apparatus, wherein the charge selector is configured to selectively pass only the desired ions at the second charge state therethrough, thereby defining a final ion beam comprising the desired ions at the second charge state and approximately zero trace metal ions.