Abstract

Polycrystalline films of PbS:Fe are obtained via hydrochemical deposition from an ammonia-citrate bath containing 10⁻⁵ to 7 × 10⁻³ M of FeCl₂ doping additive. The films’ morphology is studied along with their structural and optical properties. An increase in the lattice parameter of PbS doped up to 5 × 10^‒3 M testifies to the interstitial position of Fe²⁺ ions, while a subsequent reduction in the lattice parameter is due to some of the lead ions in the PbS crystal lattice being replaced with iron ions of a smaller radius. Doping with iron ions produces impurity absorption bands in the optical absorption spectra of PbS:Fe films. Rearrangement of the zone structure of lead sulfide near the edge of the band gap is observed in a film obtained from a solution containing 5 × 10⁻³ M FeCl₂. The change in the zone structure is due to the lead ions in the PbS lattice being replaced with iron ions.

中文翻译：

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铁（II）掺杂后PbS薄膜结构和光学性质的演变

摘要

PbS：Fe的多晶膜是通过水化学沉积从含有10 ^-5至7×10 ^-3 M FeCl ₂掺杂添加剂的柠檬酸氨浴中获得的。研究了薄膜的形态，结构和光学性能。掺杂至5×10 ^‒3  M的PbS的晶格参数增加证明了Fe ²⁺的间隙位置离子，而随后晶格参数的降低是由于PbS晶格中的某些铅离子被较小半径的铁离子所替代。掺杂铁离子会在PbS：Fe薄膜的光吸收光谱中产生杂质吸收带。在由含有5×10 ^-3 M FeCl ₂的溶液获得的膜中，观察到带隙边缘附近的硫化铅的区域结构的重排。区域结构的变化是由于PbS晶格中的铅离子被铁离子所替代。