This standard specifies the infrared absorption testing method for carbon concentration in semi insulating gallium arsenide single crystals. This standard is applicable to the determination of carbon concentration in undoped and carbon doped semi insulating gallium arsenide single crystals with a resistivity greater than 10 ° Q ● cm. Measurement range: From 1.0 X 105 atoms/em3 to the maximum solubility of substituted carbon atoms at room temperature, with a detection limit of 4.0 X 10 'atoms/cm2 at 77 K. The following normative references are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document. The terms and definitions defined in GB/T 14264 Semiconductor Materials Terminology 3 are applicable to this document. Summary of Method 4: Carbon is the main shallow acceptor impurity in semi insulating gallium arsenide. The absorption coefficient of its localized mode vibrational band (with a peak position of 580em - 'at room temperature and 582cm -' at 77K) corresponds to the concentration of substituted carbon. Based on the measured absorption coefficient, carbon can be calculated using empirical formulas
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