Copper Incorporation into CdS Thin Films by Ionic Exchange in an Aqueous Solution Process at Room Temperature

Figure 4

SEM images of CdS thin films placed into CuCl₂ solution at different immersion times (a) CdS reference, (b) 60 min, (c) 75 min, and (d) 90 min.

(a)

(b)

(c)

(d)