مشخصات پژوهش

For verifying the influence of donor–acceptor supramolecules on photovoltaic properties, different hybrids were designed and used in organic solar cells. In this respect, reduced graphene oxide (rGO) was functionalization with 2-thiophene acetic acid (rGO-f-TAA) and grafted with poly(3-dodecylthiophene) (rGO-g-PDDT) and poly(3-thiophene ethanol) (rGO-g-PTEt) to manipulate orientation of poly(3-hexylthiophene) (P3HT) assemblies. Face-on, edge-on, and flat-on orientations were detected for assembled P3HTs on rGO and its functionalized and grafted derivatives, respectively. Alteration of P3HT orientation from face-on to flat-on enhanced current density (Jsc), fill factor (FF), and power conversion efficiency (PCE) and thus Jsc57.11 mA cm 22 ,FF547%, and PCE52.14% were acquired. By adding phenyl-C71-butyric acid methyl ester (PC71BM) to active layers composed of pre-designed P3HT/ rGO, P3HT/rGO-f-TAA, P3HT/rGO-g-PDDT, and P3HT/rGO-gPTEt hybrids, photovoltaic characteristics further improved, demonstrating that supramolecules appropriately mediated in P3HT:PC71BM solar cells. Phase separation was more intensified in best-performing photovoltaic systems. Larger P3HT crystals assembled onto grafted rGOs (95–143 nm) may have acted as convenient templates for the larger and more intensified phase separation in P3HT:PCBM films. The best performances were reached for P3HT:P3HT/rGO-g-PDDT:PCBM (Jsc59.45 mA cm 22 , FF554%, and PCE53.16%) and P3HT:P3HT/rGO-g-PTEt:PCBM (Jsc59.32 mA cm 22 ,FF553%, and PCE53.11%) photovoltaic systems.