Patent ID: 9384943
Filing Date: 2016-07-05
CPC Classification: H01J

Claim Text:
1. A method of removing a fluorine compound deposited in a source housing of an ion generating apparatus after a filament of the apparatus breaks during an ion implantation process using a fluorine compound gas, the ion generating apparatus comprising: a chamber; a filament arranged within the chamber for generating thermal electrons; a direct-current power supply connected in series to the filament; a gas introduction port for introducing gas into the chamber; an ion beam take-out port for taking out ions generated within the chamber to outside the chamber; opposed electrodes provided at both ends of the filament and electrically connected in series with the filament, each of the electrodes being arranged between the direct-current power supply and the filament; and a high-frequency power supply arranged in parallel to the direct-current power supply, the ion generating apparatus allowing connection between the direct-current power supply and the opposed electrodes and connection between the high-frequency power supply and the opposed electrodes to be selected with a switch, the method comprising: disconnecting the direct-current power supply from the opposed electrodes and connecting the opposed electrodes and the high-frequency power supply to each other after breakage of the filament; introducing a hydride gas through the gas introduction port; applying high frequency power to the opposed electrodes to ionize the hydride gas, to thereby generate hydrogen ions; and discharging the hydrogen ions through the ion beam take-out port into the source housing, reducing the fluorine compound deposited within the source housing, and discharging gas containing generated fluorine with a vacuum pump, whereby during ion implantation using fluorine compound gas, the deposited fluorine compound is removed through ionizing the hydride gas under a condition in which the filament is broken.