Effects of Zinc Oxide Nanoparticles on Properties of SAC0307 Lead-Free Solder Paste

Figure 11

The intermetallic layer between the Cu substrate and (a) SAC0307, (b) SAC0307-0.25ZnO, (c) SAC0307-0.50ZnO, (d) SAC0307-0.75ZnO, and (e) SAC0307-1.00ZnO.

(a)

(b)

(c)

(d)

(e)