Patent ID: 6803242
Filing Date: 2004-10-12
Classification: H01L

Abstract:
An evaluation method of IG effectivity in semiconductor silicon substrates, comprising experimentally obtaining the optimum ranges of the diagonal length and density of oxygen precipitates which make the gettering (IG) effectivity on Cu favorable in advance, and evaluating the IG effectivity on Cu by whether the diagonal length and density of oxygen precipitates fall within the optimum ranges, wherein the optimum ranges are ranges in which L becomes larger than 300 nm when a value of D is smaller than 1Ã—109/cm3, and L becomes larger than 200 nm when a value of D is not less than 1Ã—109/cm3, where L (nm) is a diagonal length of the oxygen precipitates and D (/cm3) is a density of the oxygen precipitates.