مشخصات پژوهش

Polyaniline-grafted reduced graphene oxide (PANI-graft-rGO) was synthesized by in situ oxidative polymerization of aniline using amine-terminated rGO (rGO-NH2) as an initiator. Nanosheets were applied as templates for crystallization of regioregular poly(3-hexylthiophene) (P3HT) chains. The resulting nano-hybrids entitled supra(rGO-NH2/P3HT) and supra(PANI-graft-rGO/P3HT) were utilized in the active layers of P3HT:phenyl-C71-butyric acid methyl ester (PC71BM) solar cells to improve the photovoltaic characteristics up to (6.79 mA/cm2, 43%, and 0.65 V) and (13.21 mA/cm2, 64%, and 0.67 V), leading to the efficiencies of 1.90% and 5.66%, respectively. In similar conditions and only via replacing the rGO-NH2 with PANI-graft-rGO, the photovoltaic features were elevated. It could be assigned to the impact of PANI grafts in facilitating th[e surface crystallization of P3HT host chains and thereby in well-arranging the active layer constituents. The PANI mediators may act as both acceptors (accepting the electrons from rGO) and donors (donating the electrons to P3HT crystals) in configuration of supra(PANI-graft-rGO/P3HT) nano-hybrids, thus made the supra(PANI-graft-rGO/ P3HT) nanostructures the appropriate candidates in manipulation of cell factors. This phenomenon was comprehended from the escalation in contents of hole (mh) and electron (me) mobilities and also short circuit current density (Jsc) values. The highest me (8.9
10–3 cm2/V.s) and mh (4.5
10–3 cm2/ V.s) were acquired for electron-only (Al/supra(PANI-graft-rGO/P3HT):P3HT:PC71BM/Al) and hole-only (indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/ supra(PANI-graft-rGO/P3HT):P3HT:PC71BM/Pd) devices. In similar conditions, the charge mobilities were lower in rGO-NH2 based systems either with PC71BM molecules or without them.