Influence and relationship of film morphology on Organic Solar Cells manufactured with different P3HT:PC[70]BM blend solutions

In the present work, the morphology and performance of Bulk Heterojunction Organic Solar Cells (BHJ-OSC) manufactured with three different ratios of P3HT:PC_[70]BM (1:0.84, 1:1 and 1:1.21, wt%) were studied. These films were made with a mixture of solvents o-dichlorobenzene:chlorobenzene (DCB:CB) at a fixed ratio by volume of 6:4, v/v. The film morphology of the OSCs was characterized by atomic force microscopy (AFM) and transmission electron microscopy (TEM). The performance parameters of the OSC were extracted from current density-voltage characteristic (J-V) curves recorded in the dark and under illumination and correlated to the morphology of the active layer. We discuss observed variations in phase segregation regions due to changes in the P3HT:PC_[70]BM ratio.