Abstract
Low-temperature (1.8 K) excitonic absorption, reflection and photoluminescence spectra of mixed Zn(P 1− x As x ) 2 crystals have been studied at x=0.01, 0.02, 0.03 and 0.05. Energy gap and rydbergs of excitonic B-, C- and A-series decrease monotonically with increasing of x. The spectral half-widths of the absorption n=1 lines of the B- and A-series increase monotonically with increase in x due to fluctuations of crystal potential. Emission lines of excitonic molecules have been observed in photoluminescence spectra of Zn(P 1− x As x ) 2 crystals. The binding energy of the molecule increases with increase in x due to the decrease of the electron–hole mass ratio.
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