Electronic and optical properties of Cd<Subscript>1-x</Subscript>Zn<Subscript>x</Subscript>S nanocrystals

We report a numerical simulation of the conduction and valence band edges of Cd<Subscript>1-x</Subscript>Zn<Subscript>x</Subscript>S nanocrystallites using a one — dimensional potential model. Electron — hole pairs are assumed to be confined in nanospheres of finite barrier heights. Optical absorption measurements are used to fit the bandgap of the Cd<Subscript>1-x</Subscript>Zn<Subscript>x</Subscript>S nanocrystal material. A theoretical analysis is also made to calculate the energy location of bound excitons and the oscillator strength of interband transitions as a function of zinc composition. The aim of the latter study is to investigate the optical behavior of Cd<Subscript>1-x</Subscript>Zn<Subscript>x</Subscript>S nanocrystals. An attempt to explain all the results is presented. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006