Funct. Mater. 2019; 26 (2): 228-232.
Influence of stoichiometric cadmium excess on photoelectret properties of CdI2-PbI2 crystal system
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
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.
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