Ag Incorporation in Cu2ZnSnS4 Thin Film Solar Cell Absorbed Layer

The (Ag1-xCux)2ZnSnS4 (ACZTS) absorption layers with different Ag atomic ratio were fabricated by using co-electrodeposition and magnetron sputtering. The composition, structure, morphology and performance of the film were investigated by X-ray diffraction (XRD), raman spectra, scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS) and electrochemical measurements. The results show that the ACZTS film is Cu poor and Zn rich. The incorporation of Ag has a great influence on the morphology of the film. The growth of grain size can be obviously improved with the increase of the Ag atomic ratio, and the surface of film becomes denser; after the incorporation of Ag, the surface of the film has n-type and p-type semiconductor features; when the Ag atomic ratio is 22%, the absorption of the incident light is significantly enhanced, and the transient current density is the largest, when the Ag atomic ratio is 28%, the enhancement of steady current density is the most obvious.