概要（Overview）

The VIISion 200 is a high current ion implantation system that autotunes and implants high doses with high beam currents for improved throughput. The design of the ion optics allows low energy implants in drift mode. When implanting with high currents, a plasma flood gun system is used to prevent wafer charging problems. The beam line design incorporates a number of significant features to enhance the generation and transport of ion beams with high efficiencies and minimal heavy metals and particle production. These include a dual filament ion source, a constant current extraction system with variable z axis and suppression voltage, a very high resolving power high acceptance mass analysis system, a rotating mass defining slit, a variable gap acceleration system and a full faraday in front of the wafer.