Abstract
In this study, lead sulfide (PbS) thin films were synthesized using chemical bath deposition (CBD) on glass substrates, employing lead nitrate and thiourea as source of Lead and Sulfur respectively, and triethanolamine was used as complexing agent. The research systematically examined the impact of two key parameters: deposition time (30-90 minutes) and bath temperature (55-90°C), revealing intricate relationships between deposition conditions and film characteristics. Deposition time analysis demonstrated a non-linear transmittance trend, with values changing from 20% at 30 minutes to 8% at 60 minutes, before recovering to 10% at 90 minutes. Additionally, the band gap changed from 2.00 eV at 30 minutes to 1.63 eV at 60 minutes and then increased to 1.70 eV at 90 minutes. Temperature variations showed a progressive decrease in transmittance from 23.75% at 55°C to 11% at 90°C, accompanied by a corresponding band gap reduction from 1.80 eV to 1.50 eV. The optimal conditions for producing high-quality PbS thin films suitable for p-type solar cell applications were determined to be a deposition time of 45 minutes and a bath temperature of 90°C, which effectively balance transmittance and band gap requirements. These findings provide crucial insights for enhancing PbS thin film performance in solar cell and infrared detection technologies, demonstrating the significance of precise parameter control in chemical bath deposition.
Published Version
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