Optical absorption edges at 300 K and 80 K have been measured for single crystals of the compounds ZnSiP 2 , ZnSiP 1.5 As 0.5 , ZnSiP 1 As 1 , ZnSiP 0.5 As 1.5 and ZnSiAs 2 . Exponential absorption edge tails were observed in all cases. The minimum energy gap increases from ZnSiAs 2 through the range to ZnSiP 2 ; a value of approximately 2.0 eV at 300 K for ZnSiAs 2 agrees with previous results, but the value of approximately 2.5 eV for ZnSiP 2 is significantly higher than previous measurements.
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Clark et al. (1973) studied this question.
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