ВИКОРИСТАННЯ ЕКСИТОННИХ СПЕКТРІВ ДЛЯ ВИЗНАЧЕННЯ ШИРИНИ ЗАБОРОНЕНОЇ ЗОНИ НАПІВПРОВІДНИКА

In this work, we study the effect of excitons on the absorption spectra of solids. The study of exciton absorption spectra makes it possible to investigate the optical and structural properties of solids by a non-destructive method. The spectrum of the semiconductor Cs3Cu2I5 is studied in this work. Several exciton bands are observed in the absorption spectrum. The study of the spectral series of exciton bands allowed us to determine the width of the band gap of the compound, the exciton binding energy and its radius.