Patent ID: 9412595
Filing Date: 2016-08-09
CPC Classification: H01L

Claim Text:
1. A method comprising: performing ion implantation using a first ion implant tool and a second ion implant tool; obtaining, for each of the first and second ion implant tools, condition parameters comprising at least (i) a beam uniformity metric for an ion beam of the implant tool, (ii) a beam angle spread metric for the ion beam, and (iii) a rate of glitches for the ion beam, wherein each of the condition parameters is based on performance data for the respective ion implant tools collected over a predetermined time period; assigning, using a tool dispatch system that controls the first and second ion implant tools, a numerical weight to each of the condition parameters; generating a score for each of the first and second ion implant tools, the score being based on a weighted sum of the condition parameters for the ion implant tool, wherein each of the condition parameters is weighted based on its respective assigned numerical weight; comparing the scores for the first and second ion implant tools; selecting one of the first and second ion implant tools to perform an ion implantation task based on the comparison; determining whether the selected ion implant tool satisfies a fault condition based on the score for the selected ion implant tool; based on a determination that the selected ion implant tool does not satisfy the fault condition, performing the ion implantation task with the selected ion implant tool; and based on a determination that the selected ion implant tool satisfies the fault condition, selecting another ion implant tool to perform the ion implantation task.