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

Figure 5

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

(a)

(b)

(c)