Characteristics and the effect of additives on the nanomorphology of PTB7/PC71BM composite films

Organic photovoltaic's (OPVs) have been intensively investigated in recent years for generation of affordable, clean, and renewable energy due to their low-cost fabrication of large-area devices, lightweight, mechanical flexibility, and easy tunability of chemical properties of the polymer materials. The organic thin film solar cells prepared by PTB7/PC71BM composite were fabricated, characterized and their effects of additives were studied. Topographic images were obtained by the Atomic Force Microscopy (AFM). The current density–voltage (J–V) characteristics of photovoltaic cells were measured under the illumination of simulated solar light with 100  mW cm−2 (AM 1.5G) by an Oriel 1000 W solar simulator. The organic thin film solar cell fabricated with the 1:1.5 ratio shows the power conversion efficiency (PCE) of 3.92%. The obtained results show a considerable impact and bright future for organic polymer solar cells.