S. Ramakrishnan, Shiladitya Chakravorty, Jensen Tay, David Olsen, Peter Zumpano
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Staggering Preventive Maintenance Actions at CMP Using a Dispatching Algorithm
In a semiconductor fab, distributing wafers equally across a toolset (set of tools that perform similar operations) helps achieve a higher throughput as opposed to loading them unevenly. However, in some processing steps, level loading tools leads to uniform usage of consumables (material used up at a tool in processing wafers) and can trigger simultaneous Preventive Maintenance (PM) actions to replenish them. Managing simultaneous PMs with a small maintenance team reduces tool availability while using a bigger workforce entails higher costs. This study presents ways to overcome this situation by staggering PM actions across tools
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