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Soviet physics. Semiconductors, vol.15, no.5, pp.540-542, 1981 (Scopus)
A study of the ordinary and differential absorption spectra of TlGaS//2//xSe//2//(//1// minus //x//) (0 less than equivalent to x less than equivalent to 1) crystals, recorded at 6 degree K, revealed absorption lines corresponding to direct optical transitions to two exciton energy bands of different symmetry in TlGaSe//2 crystals. The energy was determined of that exciton band to which optical transitions in TlGaSe//2 crystals were assisted by phonons. The shift of the exciton bands of TlGaS//2//xSe//2//(//1// minus //x//) crystals was plotted as a function of the composition. The results indicate that in the range of compositions with x equals 0. 1 there was a change in the nature of the optical transitions when the composition x was altered.