Abstract. Adduced in this work are the results of theoretical investigations devoted to the influence of spatial confinement effects, self-polarization of heterojunction planes and exciton-phonon interaction on values of the exciton transition energy in lead diiodide nanofilms placed into dielectric ambience (glass or polymer). The heterojunction is considered to be unloaded, nanosystem is modeled with an infinite deep quantum well and characterized by an essential difference between dielectric permeabilities in both sides of the heterojunction. Calculated in the work are dependences of the exciton energy on the nanofilm thickness and temperature. The results of calculations are in accordance with the known data of experimental measurements.

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Theoretical investigation of the spatial confinement, self-polarization and exciton–phonon interaction influence on the exciton state in plane double nanoheterostructure (nanofilm)–lead iodide in polymeric matrix is performed within the effective mass approximation for the electron and dielectric continuum for the phonons in the framework of infinitely deep single quantum well. It is shown that spatial confinement is the dominating feature determining the energy of the bottom of exciton ground band and its binding energy. The relationship of two others depends on nanofilm thickness: in ultrathin films the influence of self-polarization effect is essentially bigger than the role of exciton–phonon interaction.

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