Abstract
Within the framework of the effective mass approximation, the energy of the ground state of an electron-hole pair was obtained by the variational method as a function of the radius of the nanocrystal of cadmium sulfide. Determined that the absorption peaks of the nanosystem are caused by interband transitions of electrons from quantum-confined energy levels, located in the valence band of a colloidal nanocrystal of cadmium sulfide, to quantum-confined energy levels, located in the conduction band of CdS nanocrystal.
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