Hopping Conductivity in (Zn,Fe)Se Intentionally Doped with Ag
A. Zaręba
Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland

and M. Demianiuk
Institute of Technical Physics, WAT, Warszawa, Poland
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The transport phenomena in (Zn,Fe)Se were studied. In order to obtain iron centers in Fe3+ charge state the crystals were doped by Ag what produces acceptors compensating Fe2+ donors. The results are explained in terms of thermally activated jumping of charges between Fe3+ and Fe2+ centers. The nature of activation energy is discussed. The polaron model seems to be not valid in our case. The Coulomb interaction between charged acceptors and "holes" on iron centers is considered as the origin of thermal activation of jumps. We suggest the deviation from random and mutually independent distributions of charged Ag acceptors and Fe3+ ions resulting from the electrostatic interactions between them at high temperatures.
DOI: 10.12693/APhysPolA.82.749
PACS numbers: 71.55.Gs, 72.80.Ey