Job Description:

• 1) Inspects, measures, and tests semiconductor crystal ingots to determine compliance with specifications, using measuring devices and test equipment: Transports ingot to workbench by cart or by hand.

• 2) Measures ingot flat, diameter, and length, using calipers and ruler.

• 3) Weighs ingots on scales and calculates weight loss due to grinding and sawing.

• 4) Tests ingot resistivity, using electronic probes.

• 5) Records weights, measurements, and other test results in logbook and on labels, and attaches labels to ingots.

• 6) May operate saws to cut off ends of crystal or to cut sample wafers.

• 7) May tend furnace that heat-treats ingots to alter resistivity to meet specifications.

• 8) May determine crystal orientation, using x-ray machine.

• 9) May operate grinding machine to bevel ends of crystals.

• 10) May operate sandblasting machine to remove glaze from ingot surface.

• 11) May tend equipment that etches ingots to remove surface material.

• 12) May calculate proportion of impurities, using resistivity readings and specified formula.