Journal of Applied Physics · 2010 · 24 citations · 15 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsElectronic MaterialsMaterials PhysicsCompound SemiconductorsCrystal ChemistryElectronic Band StructureOptical Properties Of SemiconductorsOptical Properties Of SolidsOptoelectronic MaterialsCompositionExciton Bohr RadiusExcitonsHalide PerovskitesPhotoelectric EffectPhotoluminescencePhotoluminescence SpectroscopyTransition Metal Dichalcogenides
The low-temperature photoluminescence (PL), photodiffusion current, photoconductivity (PC), and nuclear quadrupolar resonance spectra of the layered PbI2 single crystals and Pb1−XCdXI2 alloys were investigated. It was shown that the alloys are formed for any composition ratio and they have monopolar (hole) PC. The exciton PL band energy depends linearly on the composition ratio. It was found that the PbI2 clusters with various sizes are formed in Pb1−XCdXI2 alloys. For X≤0.50 the clusters are large [more than the Bohr radius of exciton in PbI2 (RB)] while for X=0.50 they are both large and small (smaller than RB). It was shown that these clusters are formed within the crystal layer. For Pb1−XCdXI2 alloys with X=0.70 the broad PL band at 2.1 eV is observed. This band is caused by the formation of the self-trapping excitons in PbI2 clusters. It was found that this PL band determines the emission of the alloys at T=300 K.
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