Patent ID: 9269540
Filing Date: 2016-02-23
CPC Classification: H01J

Claim Text:
1. An ion implantation apparatus comprising: an ion implantation unit that scans in a reciprocating manner between one end and another end of a surface of a substrate with an ion beam containing first conductive ions and implants the ions into the substrate; a position detection unit that detects a scan position of the ion beam on the substrate; a charge supply unit that generates a plasma, emits second conductive charges contained in the plasma, and supplies the charges to the substrate; a current value detection unit that detects a current value changing in accordance with an amount of the charges emitted by the charge supply unit; and a determination unit that determines a charge build-up state of the substrate based on a change in the current value detected by the current value detection unit, the change being accompanied by a change in the scan position detected by the position detection unit, wherein the determination unit: