Vapor phase growth and properties of mixed layered Pb1-xCdxI2  semiconductors

O.V. Rybak; M.V. Chekaylo; N.T. Pokladok

doi:10.15330/pcss.23.2.311-316

Authors

O.V. Rybak Lviv Polytechnic National University, Lviv, Ukraine
M.V. Chekaylo Lviv Polytechnic National University, Lviv, Ukraine
N.T. Pokladok Lviv Polytechnic National University, Lviv, Ukraine

DOI:

https://doi.org/10.15330/pcss.23.2.311-316

Keywords:

Pb1-xCdxI2 crystals, vapour phase, solid solutions, polytype, X-ray diffraction study, absorption spectra

Abstract

Pb_1-xCd_xI₂ crystals (x = 0.1; 0.9) have been obtained by crystallization from a vapour phase in a closed system at over-stoichiometric iodine vapour pressure. An alloy of CdI₂ and PbI₂ was used as a source of evaporation. As a result of X-ray diffraction studies, it has been found that the obtained crystals belong to 4H-polytype, the space symmetry group is P6₃mc. The lattice parameters and the unit cell volume of crystals have been determined: for Pb_0.9Cd_0.1I₂ a = 4,529 Å, c = 13,96 Å, V = 247,9 Å³; for Pb_0.1Cd_0.9I₂ a = 4.258 Å, c = 13.70 Å, V = 215.0 Å³. The morphology of Pb_1-xCd_xI₂ solid solutions crystals has been studied by scanning electron microscopy. Grown light orange Pb_0.9Cd_0.1I₂ crystals have the shape of plates and ribbons, the surface of which is sculpted by growth figures. The transparent mixed Pb_0.1Cd_0.9I₂ crystals have been grown from the vapour phase only in the form of plates. The spectral dependences of the optical absorption of Pb_1-xCd_xI₂ crystals at room temperature have been studied. The optical widths of the band gaps of the grown crystals have been determined from the absorption spectra using the Tauc relation.

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