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Optical absorption spectroscopy of CdI 2 –BiI 3 layered crystals has been performed in the temperature range of 77–300K. The main absorption, observed in these crystals at 2.59eV is related to quantum confined exciton absorption of bimolecular BiI 3 cluster. Low energy absorption peaks at 2.38eV, 2.06eV and 1.94eV can be tentatively assigned to larger clusters composed of 4,...
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