Abstract
This paper describes a series of low temperature optical absorption measurements on vacuum deposited films of lead iodide. These results are correlated with an electron diffraction study of the film structure. In the region of intrinsic exciton absorption, a single strong absorption line is observed at 4905 Å when the crystallites are oriented with c-axes normal to the substrate. A second absorption line at 4890 Å is observed in thicker films which contain many crystallites oriented with c-axes parallel to the substrate. The two absorption lines are interpreted as allowed transitions to a localized exciton level from two branches of the valence band separated by a small crystal field splitting. This interpretation is shown to give a consistent explanation of many published results on exciton spectra in PbI 2.
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