Abstract
Two pairs of electron and hole traps have been identified in PbI2-containing CdI2 crystals in the range 80–305 K using a combination of thermally stimulated and photoinduced depolarization of a photoelectret state. The electron traps are identified as Pb+ centers in nanocrystalline 2H- and 4H-PbI2 inclusions in the CdI2 lattice. One of the hole centers is assumed to be a Pb2+ vacancy. All of the traps in the binary crystalline system are related to the presence of PbI2 impurities as a consequence of the formation of heterojunctions between the CdI2 matrix and nanocrystalline PbI2 inclusions. We have calculated the energy distribution for filled traps.
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