Chemosynthesis of nanostructures lead sulphide thin films from triethylamin (Et3N) complexing agent

Publication date: Available online 21 October 2019Source: Inorganic Chemistry CommunicationsAuthor(s): Fekadu Gashaw Hone, Francis Birhanu DejeneAbstractChemical bath deposition (CBD) route was used to prepared lead sulphide (PbS) thin films on glass substrates by using triethylamin (Et3N) as complexing agent. The influence of varying the concentration of Et3N on the electrical, morphological, photoluminescence and structural properties of the deposited thin films were studied. The XRD results justified that independent of Et3N molar concentration the crystalline preferentially growth along the (111) plane. However, the intensities of the (111), (200) and (220) planes were improved as the Et3N molar concentration increased. The XRD study promoted that Et3N concentration had visible effect on the dislocation density and other structural parameters of the synthesized PbS. The AFM study revealed that both the average roughness and root mean square had direct relation with Et3N concentration. The optical study revealed that all the deposited thin films had high reflectance in the IR region. The optical band gap calculated from Stern relation was estimated in the range of 1.57 eV to 1.35 eV. The photoluminescence spectra showed well-defined peak at 628 nm for all PbS thin films and the emission intensity directly affected by the crystalline size. The resistance of the thin films found in the order of 104 Ω and had inverse relations with Et3N molar concentrations.Graphical abstrac...
Source: Inorganic Chemistry Communications - Category: Chemistry Source Type: research