The paper is devoted to the explanation of the effect of suppressing the temperature distribution of the current carriers in the tunneling device where a nanoparticle embedded in a dielectric matrix served as a quantum dot (QD). Due to a spatial confinement the quantization of energy takes place in the QD. Each level assumed to be four-fold degenerated. We suppose the existence of the strong electron–phonon interaction in the QD leading to the attraction of electrons that exceeds the Coulomb repulsion. This interaction results in breaking the degeneracy. The discrete levels can have lower energies than the Fermi energy of the electrode. The tunneling current through these levels will not be affected by the temperature. In the proposed mechanism of the cool electrons filtration, fitting parameters are absent and nevertheless a good agreement between the theory and experiment has been achieved.

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