Characterization of the Organic Thin Film Solar Cells with Active Layers of PTB7/PC₇₁BM Prepared by Using Solvent Mixtures with Different Additives

Figure 7

AFM images of the PTB7/PC₇₁BM thin films: (a) prepared with pristine CB, (b) prepared with CB and DIO (3 v%), (c) prepared with CB and CN (3 v%), and (d) prepared with CB and DIO (3 v%)+CN (3 v%).

(a)

(b)

(c)

(d)