Figure 2

(a) TEM image (b) SAED pattern and (c) XRD spectra of polycrystalline Cu_2−xS (CuS and Cu₂S) nanoparticle precipitate prepared in electrolyte solution showing an average diameter of ~10 nm and (c) top and cross section (inset) SEM image of PHED-deposited CZTS thin films prior to the sulfurization process.