Patent ID: 7601541
Filing Date: 2009-10-13
Classification: G01N

Abstract:
1. A method for quantitatively determining the Cu concentration in a Cu-containing silicon substrate, wherein the Cu-containing silicon substrate comprises a plurality of substrates including a first, second, third, and fourth Cu-containing silicon substrate, each of the substrates having obverse and converse surfaces and containing at least 3×10 18 atoms/cm 3 of boron by heating at a temperature of no more than 600° C., and wherein the Cu concentration in the substrate is less than 10 11 atoms/cm 2 , which comprises: cleaving each Cu-containing silicon substrate into quadrants to obtain four quadrant sheets from each Cu-containing silicon substrate, taking a first quadrant sheet from the first Cu-containing silicon substrate, a second quadrant sheet from the second Cu-containing silicon substrate, a third quadrant sheet from the third Cu-containing silicon substrate, and a fourth quadrant sheet from the fourth Cu-containing silicon substrate, simultaneously placing the first, second, third, and fourth quadrant sheets taken from each of the first, second, third, and fourth Cu-containing substrates on a hot plate in a single layer, simultaneously heating the converse surfaces of the first, second, third, and fourth quadrant sheets at a temperature between 300° C. to 350° C. for 12 hours with the hot plate and then quantitatively analyzing the Cu concentration at the obverse and converse surfaces of each of the first, second third, and fourth quadrant sheets.