Scrapping Small Lots in a Low-Yield and High-Price Scenario

Muh-Cherng Wu*, Chie Wun Chiou, Hsi Mei Hsu

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Some wafers in a lot may become spoiled after they are processed at a workstation; such a lot is called a small lot. In a low yield and high price scenario, scrapping small lots may increase revenue and profit; yet, this notion has seldom been examined. This study presents a model for formulating the decision-making problem of scrapping small lots. A genetic algorithm is used to solve the problem when the solution space is large. An exhaustive search method is used when the solution space is small. Some numerical examples are used to evaluate the outcome of scrapping small lots. The profit obtained by the proposed scrapping method may be up to 23% higher than that obtained without scrapping.

Original languageEnglish
Pages (from-to)55-67
Number of pages13
JournalIEEE Transactions on Semiconductor Manufacturing
Volume17
Issue number1
DOIs
StatePublished - 1 Feb 2004

Keywords

  • Bottleneck
  • High price
  • Low yield
  • Product introduction
  • Small lots

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