Electrodeposition of PbS nanostructure on stainless steel 304 substrate in nitric acid solution and cyclic voltammetry and chemical impedancespectroscopy studies

Lead chalcogenides (PbS, PbSe and PbTe) and their alloys have been the subject of considerable research due to the technological importance of these materials, in crystalline and polycrystallineforms [1]. In this work, preparation of nanostructure film of lead sulfide used of electrochemicaldeposition method. Electrochemical cell containing sulfur prepare and lead salt precursors at optimised temperature and pH in present of three electrodes involve refrence Ag/AgCl (3 M Cl-)electrode, pt electrode as the counter electrode and stainless steel 304 as the working electrodeprovided and deposition process was performed using cyclic voltametry. After that, SEM results and EDX of prepared sampele, and proved formation of lead sulfide film with nanostructure anda stoichiometric ratio of 1:1. Also the XRD test results approved formation of nanocrystals oflead sulfide. In a similar experiment to evaluate the effect of complexing agent on the morphology of the prepared film, added certain amount of complexing agent EDTA into theelectrolyte solution and result of deposition compared with the sample that provide in absence EDTA by AFM analysis and conclusion significant that the surface in present of EDTA is mostly uniform. Amount of band gap in prepared film obtained with deposition of lead sulfide film on transparent glass tunicated with tin doped and then performed reflection uv test and it was equal to 3.5 eV. Then inorder to calculat the flat band potential and concentration of majority carriers, we used of chemical impedance spectroscopy and nyquist curve of prepared film obtained. Then according to results of this curves, mott-schottky plot for obtaining of flat band potential and concentration of majority carriers drawed and accord data produced.

کلیدواژه ها:

Impedance spectroscopy ، Equivalent circuit ، Semiconductor ، Lead sulfide ، Mott-Schottky plot ، cyclic voltammetry