Funct. Mater. 2019; 26 (2): 228-232.

doi:https://doi.org/10.15407/fm26.02.228

Influence of stoichiometric cadmium excess on photoelectret properties of CdI2-PbI2 crystal system

O.V.Galchynsky1, V.V.Vistovskyy2, N.V.Gloskovska2, L.I.Yarytska3, T.M.Demkiv2

1Lviv Medical Institute, 76 Polishyuk Str., 79015 Lviv, Ukraine
2I.Franko National University of Lviv, 8a Kyryla i Mefodiya Str., 79005 Lviv, Ukraine
3 Lviv State University of Life Safety, Ministry of Emergency Management of Ukraine, 35 Kleparivska Str., 79000 Lviv, Ukraine

Abstract: 

Simultaneous study of thermostimulated depolarization and spectral sensitivity of photoelectret state of the binary CdI2-PbI2 crystal system allowed to separate characteristics of the trapping centers associated with one- and two-dimensional nanocrystalline inclusions of PbI2 in CdI2 matrix. Presence of non-stoichiometric cadmium in the studied layered system and its mobility lead to complete disappearance of two maxima - of thermostimulated depolarization and spectral sensitivity of the photoelectret state belonging to one-dimensional PbI2 nanocrystals. Mechanisms of non-stoichiometric cadmium influence on one- and two-dimensional PbI2 nanocrystalline inclusions in CdI2 crystal lattice are proposed.

Keywords: 
layered crystals, nanocrystal, photoelectret state, thermostimulated depolarization, contact phenomena.
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