Tag - Crystal wafers

Coulometric determination of arsenic in gallium arsenide crystal wafers

Coulometric determination of arsenic in gallium arsenide crystal wafers The determination of small variations in the stoichiometry of undoped, semi-insulating gallium arsenide can be achieved by using constant current coulometry. Samples taken from a wafer are etched in HF, dissolved in NaOH-peroxide solution, then treated with a citric acid buffer. [...]