Optima HD: Single Wafer Mechanical Scan Ion Implanter

Splinter, P.; Graf, M.; Godfrey, C.J.; Huang, Yongzhang; Polner, D.; J, Danis; Ota, Kanji

doi:10.1063/1.2401589

Cited by 6 publications

(1 citation statement)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The large volume "bucket" ion source of the ULE including an antenna with impedance matching transformer coupling the RF power into the plasma and the directly mounted pentode extraction assembly provide a good system performance with pure and nearly contamination free fluorine ion beam. With integration of the Axcelis Optima HDx [4], a single wafer high current spot beam implanter, in an existing 200 mm LOGIC production line [5], mainly equipped with Axcelis high current batch implanter systems (ULTRA), a new tool with a comparable performance for high dose fluorine implantations was available. However, the process transfer of the high dose fluorine co-implantation from the ULE to the Optima HDx and to the ULTRA systems has shown a remarkable shift of the transistor threshold voltage (V t ).…”

Section: Introductionmentioning

confidence: 99%

Characterization of Boron Contamination in Fluorine Implantation using Boron Trifluoride as a Source Material

Schmeide¹,

Kondratenko²

2011

AIP Conference Proceedings

View full text Add to dashboard Cite

Fluorine implantation process purity was considered on different types of high current implanters. It was found that implanters equipped with an indirectly heated cathode ion source show an enhanced deep boron contamination compared to a high current implanter using a cold RF-driven multicusp ion source when boron trifluoride is used for fluorine implantations. This contamination is directly related to the source technology and thus, should be considered potentially for any implanter design using hot cathode/hot filament ion source, independently of the manufacturer.The boron contamination results from the generation of double charged boron ions in the arc chamber and the subsequent charge exchange reaction to single charged boron ions taking place between the arc chamber and the extraction electrode. The generation of the double charged boron ions depends mostly on the source parameters, whereas the pressure in the region between the arc chamber and the extraction electrode is mostly responsible for the charge exchange from double charged to single charged ions. The apparent mass covers a wide range, starting at mass 11. A portion of boron ions with energies of (19/11) times higher than fluorine energy has the same magnetic rigidity as fluorine beam and cannot be separated by the analyzer magnet. The earlier described charge exchange effects between the extraction electrode and the entrance to the analyzer magnet, however, generates boron beam with a higher magnetic rigidity compared to fluorine beam and cannot cause boron contamination after mass-separation.The energetic boron contamination was studied as a function of the ion source parameters, such as gas flow, arc voltage, and source magnet settings, as well as analyzing magnet aperture resolution. This allows process optimization reducing boron contamination to the level acceptable for device performance.Keywords: Ion implantation, high current single wafer implanter, high current batch implanter, spot ion beam.

show abstract

Section: Introductionmentioning

confidence: 99%