Ion beam apparatus and method employing magnetic scanning

Details Ion beam apparatus and method employing magnetic scanning Ion beam apparatus and method employing magnetic scanning

2007-06-13

2010-12-14

Wells, Nikita (Department: 2881)

Radiant energy

Irradiation of objects or material

Irradiation of semiconductor devices

C250S492200, C250S492300, C250S42300F, C250S3960ML, C250S3960ML, C250S281000

Reexamination Certificate

active

07851773

ABSTRACT:
A multipurpose ion implanter beam line configuration comprising a mass analyzer magnet followed by a magnetic scanner and magnetic collimator combination that introduce bends to the beam path, the beam line constructed for enabling implantation of common monatomic dopant ion species cluster ions, the beam line configuration having a mass analyzer magnet defining a pole gap of substantial width between ferromagnetic poles of the magnet and a mass selection aperture, the analyzer magnet sized to accept an ion beam from a slot-form ion source extraction aperture of at least about 80 mm height and at least about 7 mm width, and to produce dispersion at the mass selection aperture in a plane corresponding to the width of the beam, the mass selection aperture capable of being set to a mass-selection width sized to select a beam of the cluster ions of the same dopant species but incrementally differing molecular weights, the mass selection aperture also capable of being set to a substantially narrower mass-selection width and the analyzer magnet having a resolution at the mass selection aperture sufficient to enable selection of a beam of monatomic dopant ions of substantially a single atomic or molecular weight, the magnetic scanner and magnetic collimator being constructed to successively bend the ion beam in the same sense, which is in the opposite sense to that of the bend introduced by the analyzer magnet of the beam line.

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Ed A. Septier, “Focusing of Charged Particles, Deflecting Magnets”, Enge, Chapter 4.2, pp. 203-264.

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