Water Soluble Aluminum Paste Using Polyvinyl Alcohol for Silicon Solar Cells

Figure 3

SEM images of fabricated cells using each paste before etching with acidic solution (a), (b), and (c) and after chemical etching (d), (e), and (f), for Paste 1, Paste 2, and Paste 3, respectively.

(a)

(b)

(c)

(d)

(e)

(f)