OPTICAL-PROPERTIES OF A(II)B(V) SEMICONDUCTOR COMPOUNDS

The luminescence and transmission spectra of single crystals of the se miconductor compounds ZnAs2, Zn3As2, and CdAs2 in the wide temperature range of 4.2-300 K are studied. A number of previously unknown lumine scence (absorption) bands are revealed in the near-infrared region at 1-1.5 mu m These bands are assumed to be caused by different residual impurity atoms or defects. The energy band structures, radiative recom bination mechanisms, the nature of the luminescence centers, and other physical aspects of these materials are discussed. An analysis of stu dies of the optical properties of ZnAs2, Zn3As2 and CdAs2 single cryst als shows that these compounds are promising as materials for cut-off filters and immersion lenses for the infrared region of the spectrum.