A petri net-based novel scheduling approach and its cycle time analysis for dual-arm cluster tools with wafer revisiting

Yan Qiao, Naiqi Wu, Mengchu Zhou

Research output: Contribution to journalArticlepeer-review

64 Scopus citations

Abstract

For some wafer fabrication processes, such as an atomic layer deposition (ALD) process, the wafers need to visit some process modules for a number of times. Using the existing swap-based strategy scheduling method in such systems leads to a 3-wafer cyclic schedule. Unfortunately, it is not optimal in the sense of cycle time. Aiming at searching for a better schedule, this paper models the system by a timed Petri net. With this model, the properties of the 3-wafer schedule are analyzed. Then, based on the analysis, it is found that, to improve the performance, it is necessary to reduce the number of wafers completed in a cycle. Hence, a 1-wafer schedule is developed by using a new swap-based strategy. By using the Petri net model, its cycle time is analyzed and shown to be optimal. Also, an effective method is presented to implement it. Illustrative examples are given to verify the research results obtained in this paper.

Original languageEnglish (US)
Article number6324454
Pages (from-to)100-110
Number of pages11
JournalIEEE Transactions on Semiconductor Manufacturing
Volume26
Issue number1
DOIs
StatePublished - Feb 11 2013

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

Keywords

  • Cluster tools
  • optimization
  • scheduling
  • semiconductor manufacturing

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