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The title compounds (natural low-dimensional semiconductor systems) exhibit strong excitonic optical absorption bands in the UV spectral region, because of the quantum confinement of excitons, as in the cases of bivalent-metal and trivalent-metal halide complexes. The excitonic bands are shifted to longer wavelengths, approaching those of the corresponding bulk materials, as the anion-size or the anion-dimensionality increases.

zeitschrift für naturforschung b

Excitonic Bands in the Optical Absorption Spectra of (Bu 4 N)CuBr 2 , (Et 4 N) 2 Cu 2 Br 4 , (Pr 4 N) 2 Cu 4 Br 6 , (Bu 4 N) 2 Cu 2 I 4 , (Me 4 N)Cu 2 I 3 , (Pr 4 N) 4 Ag 4 I 8 , (Me 4 N)Ag 2 I 3 , (Et 4 N)Ag 2 Br 3 , and Similar Compounds