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Semiconductor manufacturing apparatus and semiconductor manufacturing method

  • US 9,899,278 B2
  • Filed: 07/07/2015
  • Issued: 02/20/2018
  • Est. Priority Date: 02/06/2015
  • Status: Active Grant
First Claim
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1. A semiconductor manufacturing method comprising:

  • extracting, in cycle etching that repeats first processes of etching a workpiece layer and second processes of performing different processing from the first processes for plural cycles, light emission intensities in the first processes for individual cycles; and

    detecting an etching end point of the workpiece layer in the cycle etching, based on the light emission intensities of the plural cycles, comprising,calculating decrease amounts of the light emission intensities for second to Nth cycles relative to the light emission intensity for a first cycle, where N is an integer of three or more, anddetermining that the cycle etching reaches the etching end point at the Nth cycle when the decrease amount of the light intensity for the (N−

    1)th cycle does not reach a threshold and the decease amount of the light intensity for the Nth cycle reaches the threshold.

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