Band cadmium compounds

Table 4.1-159 Band structures of cadmium compounds Cadmium oxide (CdO) (Fig. 4.1-167)...

Table 4.1-160 Energy gaps of cadmium compounds (for the letters A, B, C see CdS band structure. Fig. 4.1-168)...

Table 4.1-164 g-factors in the conduction band ( c) and valence band (gv) for cadmium compounds... 

Commonly used II-VI compounds include zinc sulfide, zinc selenide, zinc telluride, cadmium sulfide, cadmium telluride, and mercury cadmium telluride. These materials are not as widely used as the III-V compounds, one reason being that it is difficult to achieve p-type doping. Mercury cadmium telluride is used extensively in military night sights, which detect in the 8-13 im spectral band (a similar material, platinum silicide, is being developed for that purpose). The major applications ofCVD II-VI compounds are found in photovoltaic and electroluminescent displays. 

The values of the bond ionicily can be used to predict the forbidden band width of zinc and cadmium diphosphides this width should be 1.5-2 eV. This prediction is supported by the recent [19, 20] measurements of the optical properties of these compounds which yield the optical width of the forbidden band AE = 2 eV for ZnP2 [19] and CdP2 [20]. 

The quantum effect of reduction of particle size in reducing the band gap of semiconductors and so giving rise to novel optoelectronic properties has stimulated interest in quantum dot inclusion compounds of nanoparticles of semiconductors within zeolite pores.In a pioneering study, Herron and coworkers succeeded in introducing cadmium sulfide clusters within the pores of zeolite Y via the reaction of a cadmium-exchanged zeolite Y with hydrogen sulfide gas (Scheme 6.8). °... 

---