Вы здесь

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.
References: 

1. V.V.Averkiev', I.M.Bolesta, I.M.Kravchuk et al., Ukr. Phys. J., 25, 1392 (1980).

2. S.E.Derenzo, E.Bourret-Courchesne, Z.Yan et al., J. Luminescense, 134, 28 (2013). https://doi.org/10.1016/j.jlumin.2012.09.022

3. M.R.Tubbs, Phys. Status Solidi (b), 67, 11 (1975). https://doi.org/10.1002/pssb.2220670102

4. J.P.Zielinger, B.Pohoryles, J.C.Balland et al., J. Appl. Phys., 57, 293 (1985). https://doi.org/10.1063/1.334803

5. I.M.Bolesta, N.V.Gloskovskaya, M.R.Panasyuk et al., Inorg. Mater., 49, 214 (2013). https://doi.org/10.1134/S0020168513020039

6. I.M.Bolesta, V.V.Vistovskii, N.V.Gloskovskaya et al., Phys. Solid State, 53, 799 (2011). https://doi.org/10.1134/S1063783411040081

7. Y.Kayanuma, Phys. Rev. B, 44, 13085 (1991). https://doi.org/10.1103/PhysRevB.44.13085

8. I.M.Bolesta, V.V.Vistovskii, N.V.Gloskovska et al., Functional Materials, 23, 1 (2016). https://doi.org/10.15407/fm23.03.382

9. A.V.Gal'chinskii, N.V.Gloskovskaya, L.I.Yarytskaya, Inorg. Mater., 48, 423 (2012). https://doi.org/10.1134/S0020168512040024

Current number: