Abstract
A model is proposed to explain the observed decrease of average grain size with an increase of Fe concentration in the Pb1−xFexS (0.25⩽x⩽0.75) and Co concentration in the Pb1−xCoxS (0.15⩽x⩽0.35) nanoparticle films. Higher solubility product for MS (M=Fe and Co) as compared to PbS is observed to be responsible for the decrease of grain size with an increase of M concentration in the films. The model was found true for Pb1−xCdxS (0.45⩽x⩽0.85) and Pb1−xMnxS (0.03⩽x⩽0.37) films.
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