ELECTRO-OPTIC MEASUREMENTS OF PBS PBSE AND PBTE

The band structures of the lead salts PbS, PbSe, and PbTe have been studied by electro-optic methods. Electroabsorption and electroreflectance measurements have been made over the energy ranges 0.25 to 0.65 eV and 0.6 to 5.5 eV, respectively, using an electrolyte to produce electric fields at the surface of these materials. An enhancement of the existing structure in absorption and reflection was generally observed, together with new structure apparently not related to formerly observed transitions. The analysis of these structures leads to the symmetry and energy of several transitions not previously seen. The experimental results are correlated with the band-structure calculations of Lin and Kleinman, and in general support their results. © 1968 The American Physical Society.