Variant UV Spectra in CdI2 Films

Optical absorption and reflection spectra were measured simultaneously upon various CdI 2 films, prepared onto silica glass, KCl, and mica under several different conditions. The simultaneous measurements were effective for investigating in situ the film state both near the free surface and film/ substrate interface as well as in the deeper interior of the film. The films deposited at 77 K were all in the amorphous state. In the crystalline films, three types of spectral variants, with type 1 exhibiting a sharp band-gap exciton peak at 3.912 eV, type 2 two sharp band-gap exciton peaks at 3.633 and 3.763 eV, and type 3 missing excitonic structure, were found suggesting new crystalline states.

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