The influence of solution-precursors on optical properties of In2S3 films deposited by successive ionic layer adsorption and reaction

The method of ion lamination from aqueous solutions of various compositions is used to form In2S3 films on the surface of TiO2 and porous anodic Al2O3. It is established that the composition of the cationic and anionic solution-precursors affects the films' optical band gap, which varies in the range 1.97-2.65 eV. This is accounted for in the context of variation in the content of oxygen in In2S3. The observed dependences of optical properties on the value of the pH for anionic precursors and on the nature of the anion in cationic precursors are in good agreement with calculated conditions for chemical equilibrium in the studied systems. The dependence of the efficiency of photoelectric conversion in solar cells with ultrathin absorbing layers on the content of oxygen in the In2S3 films obtained by ionic lamination is demonstrated.