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    • 7. 发明申请
    • AN ION IMPLANTER WITH POST MASS SELECTION DECELERATION
    • 具有后质量选择减少的离子植绒
    • WO1997017716A1
    • 1997-05-15
    • PCT/GB1996002740
    • 1996-11-08
    • APPLIED MATERIALS, INC.ENGLAND, Jonathan, GeraldMOFFATT, StephenARMOUR, David, GeorgeFOAD, Majeed
    • APPLIED MATERIALS, INC.
    • H01J37/30
    • H01J37/3171H01J37/3007H01J2237/04756
    • A post mass selection decel lens (9) is located between the exit aperture (55) of the mass selection chamber (47) and the entry (74) to the electron confinement tube (69) of the PFS. The lens comprises a first electrode (65) at the substrate potential, a second electrode (60) at the flight tube potential, and a field electrode (61) between them at a relatively high (negative) potential sufficient to provide focusing of the ion beam at the first electrode. The first electrode is larger than the beam to avoid deflecting ions at the periphery of the aperture out of the beam. The first electrode has an aperture which is smaller than that of the field electrode. The field electrode is at least -5kV relative to the flight tube, that is substantially more than required for electron suppression. Additional apertures are provided between the process chamber and the mass selection chamber to improve evacuation.
    • 后质量选择减速透镜(9)位于质量选择室(47)的出口孔(55)和PFS的电子限制管(69)的入口(74)之间。 该透镜包括在基底电位处的第一电极(65),处于飞行管电位的第二电极(60)和位于它们之间的场电极(61),其处于相对高(负)电位,足以提供离子的聚焦 光束在第一电极处。 第一电极大于光束,以避免将光圈外围的离子偏离光束。 第一电极具有小于场电极的孔径。 场电极相对于飞行管至少为-5kV,这大大超过了电子抑制所需要的范围。 在处理室和质量选择室之间提供额外的孔,以改善抽气。