VAC 407 2 A

Ion implantation is a critical process in the fabrication of integrated circuits and discrete semiconductor devices. The tool accelerates ions of a desired dopant species and directs them into the wafer surface, controlling both the depth and concentration of the implanted impurity.

The beam energy determines the depth of penetration, while the ion dose (fluence) controls the dopant concentration. The VAC 407 2 A, like other implanters of its class, includes an end station that holds the wafer and may incorporate in-situ beam current measurement for dose control.

Ion implantation is used after pattern definition (lithography and etching) to selectively dope regions of the silicon substrate. The implanted wafer then undergoes a thermal annealing step to activate the dopants and repair crystal damage caused by the implantation.

The tool is part of the front-end-of-line (FEOL) process flow, typically following gate formation and preceding contact formation. Multiple implantation steps with different species and energies are used to create wells, source/drain junctions, and threshold-adjust regions.

Ion implantation is used to dope silicon wafers with p-type (e.g., boron) or n-type (e.g., phosphorus, arsenic) impurities. The VAC 407 2 A can be applied to a range of semiconductor devices including CMOS logic, memory, and power devices.

The process enables precise control of dopant profiles, which is essential for modern high-performance integrated circuits. Implantation is also used for threshold adjustment, channel doping, and formation of buried layers.