Abstract
The absorption spectrum of Cs2ZnI4 thin films in the energy range 3–6 eV at temperatures from 90 to 340 K has been investigated. It is established that this compound belongs to direct-gap insulators. Low-frequency exciton excitations are localized in ZnI4 structural elements of the lattice. Phase transitions at 280 K (paraelectric phase ↔ incommensurate phase), 135 K (incommensurate phase ↔ monoclinic ferroelastic phase), and 96 K (monoclinic phase ↔ triclinic ferroelastic phase) have been found from the temperature dependences of the spectral position and halfwidth of the low-frequency exciton band. Additional broadening of the exciton band is observed for ferroelastic phases; it is likely to be due to exciton scattering from strain fluctuations near domain walls.
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