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

Table 3

Surface roughness parameters of the PC₇₁BM thin films obtained from AFM analysis.

Layer	Peak-to-valley; [nm]	Root-mean-square roughness [nm]
PC71BM with pristine CB	3.4	0.4
PC71BM with CB and DIO (3 v%)	3.3	0.3
PC71BM with CB and CN (3 v%)	3.8	0.3