ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Absorption in nanosystems containing cadmium sulfide nanocrystals in the ultraviolet spectral ranges

Serhii I. Pokutnii

Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, Kiev, Ukraine

E-mail: pokutnyi.serg@gmail.com

Received: 4 March 2024  Accepted: 9 May 2024

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. It is shown that the main contribution to the ground state energy of an electron–hole pair moving in a CdS nanocrystal is made by the energy of the Coulomb electron–hole interaction, as well as the energy of the polarization interaction of the electron and hole with the interface (nanocrystal–matrix). It is 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.

Keywords: Electron quantum-confined states; Electron transitions; Colloidal cadmium sulfide nanocrystals

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-024-03516-0

Chemical Papers 78 (10) 5937–5941 (2024)