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The optical band gap (E g) of Pb 1−x Fe x S solution-grown nanoparticle films was varied from 2.65 to 2.22 eV with an increase in iron concentration 0.25 x 0.75 in films grown at fixed pH and temperature by the chemical bath deposition method. The presence of excitonic structure in the ternary Pb 1−x Fe x S for x 0.50 suggests increasing binding energy with increase in iron concentration in the films. A shift of excitonic peak towards higher energy with an increase in iron concentration is also observed.

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