Chemical Bath Deposition of Lead Sulfide Thin Films

Chemical bath deposition (CBD) is a versatile, low-temperature method for producing uniform lead sulfide (PbS) thin films on diverse substrates. In a typical process, substrates are immersed in an aqueous solution containing a lead precursor and a sulphur source under basic conditions, where controlled release of sulphide ions initiates film growth. Two principal growth mechanisms operate: ion-by-ion deposition, in which individual ions react at the substrate interface, and cluster-by-cluster deposition, in which pre-nucleated colloidal clusters adhere and coalesce. By adjusting parameters such as bath composition, pH, temperature, complexing agents and deposition time, researchers can finely tune film thickness, grain size, crystallinity, stoichiometry and optoelectronic properties. PbS films deposited by this route exhibit a direct bandgap in the near-infrared region, rendering them promising for photodetectors, photovoltaic cells, infrared sensors and thermoelectric devices. Recent advances have expanded the scope of CBD-grown PbS to include controlled doping, substrate micropatterning and integration with microelectronic architectures, highlighting the global significance of this cost-effective fabrication technique.

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Chemical Bath Deposition of Lead Sulfide Thin Films publication trend

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Technical terms

Chemical bath deposition: A solution-based process in which controlled precipitation of compounds forms a thin film on a substrate surface.

Ion-by-ion deposition: A growth mechanism where individual cations and anions react at the substrate interface to build up the film.

Cluster-by-cluster deposition: A mechanism involving adhesion and coalescence of pre-formed colloidal clusters onto the substrate.

Threading dislocation density: The number of linear crystallographic defects per unit area within a thin film, affecting its structural quality.

Oxidation state: The formal charge assigned to an element in a compound based on electron count conventions.

Bandgap energy: The energy difference between the valence band and the conduction band that determines a semiconductor’s optical absorption edge.

References

1. Comparative Microstructure Characteristics of Synthesized PbS Nanocrystals and Galena. Sci (2024).
2. Unusual Defect Chemistry of Thorium Doping of PbS. Inorganic Chemistry (2024).
3. Effect of GaAs Substrate Micropatterning on Threading Dislocation Density in Solution-Deposited Lead Sulfide Thin Films. ACS Applied Electronic Materials (2024).