Investigation of Optical and Electrical Properties of Silver Sulfide Films Deposited on Polyamide Substrates

Abstract

A low cost chemical bath deposition (CBD) technique has been used for the preparation of Ag₂S thin films on polyamide 6 (PA) substrates. Optical and electrical properties of these films were investigated. Optical micrographs have shown that the surface morphology depends on the number of immersions, becoming more continuous and homogeneous. The UV/Vis absorption spectra show that peak observed at 240 nm is assigned to sulfide functional group and less intense shallower band observed at 350 nm is attributed to silver. Analysis of IR spectrum shows that a new material (silver sulfide) is formed or bonded on the surface of PA after modification in acidic aqueous AgNO₃/Na₂S₂O₃·5H₂O solution. The value of sheet resistance of silver sulfide layers varies from 39 MW/cm² to 1.26 MW/cm². The sheet resistance depends on the concentration of silver nitrate solution and number of samples immersions in precursor solutions.

DOI: http://dx.doi.org/10.5755/j01.ms.19.1.3817