Patent ID: 8652953

Claim:
A plasma doping method using a plasma processing device, the plasma processing device including a vacuum chamber including a through gate and a gate shutter and a sample electrode, the plasma doping method comprising steps of: transferring a sample into the vacuum chamber via the through gate of the vacuum chamber; mounting the sample on the sample electrode in the vacuum chamber; evacuating the inside of the vacuum chamber while flowing a gas toward the sample almost isotropically from gas blowout holes opposed to the sample; generating plasma in the vacuum chamber while controlling an inside of the vacuum chamber at a predetermined pressure; and causing impurity ions in the plasma to collide with a surface of the sample to introduce the impurity ions into the surface of the sample, wherein: the through gate is covered with the gate shutter when the plasma is generated, the gate shutter includes a driving device movable between an open position where the through gate is opened and a closed position where the through gate is covered, the driving device includes a motor, a rotary body in intimate contact with the gate shutter, and a transmission part for transmitting rotary motion of the motor to the rotary body, the gate shutter has a cylindrical shape and includes an opening, the vacuum chamber has a cylindrical shape, the plasma processing device further includes a cylindrical inner chamber fixed to the vacuum chamber inside the gate shutter, a lowermost part of the cylindrical inner chamber is positioned below a lowermost part of the gate shutter, the lowermost part of the cylindrical inner chamber is positioned below an upper surface of the sample electrode, the cylindrical inner chamber is fixed to the vacuum chamber by placing a hood part projecting outside a cylinder on an upper surface of the vacuum chamber, and the cylindrical inner chamber and the gate shutter are coupled to each other with a first and second cylindrical bearing units, the first cylindrical bearing unit being provided at a position higher than the through gate, and the second cylindrical bearing unit being provided at a position lower than the through gate.