Enhancement of Photovoltaic Performance and Light Harvesting inP۳HT:PC۷۱BM:Graphene Quantum Dot:N۷۱۹ Dye Quaternary PolymerSolar Cells

The incorporation of multiple active components in the photoactive layer of polymer solar cells(PSCs) has been demonstrated as a practical and effective strategy to extend the sunlight absorptionwindow for high-performance PSCs. Here, a novel polymer donor-based quaternary system isdesigned by incorporation of amine-functionalized graphene quantum dots (GQDs) and tetrabutylammonium cis-bis (isothiocyanato) bis (۲,۲′-bipyridyl-۴,۴′-dicaboxylato) ruthenium (II) (N۷۱۹) dyeinto the poly(۳-hexyl thiophene):[۶,۶]-phenyl-C۶۱-butyric acid methyl ester (P۳HT:PC۷۱BM) binarysystem. Within this quaternary PSC, it is revealed that the addition of a very low amount of GQDsand N۷۱۹ dye broadens the light absorption region and reduces the charge recombination. Moreover,the cascade-like energy levels between the polymer donor, fullerene-based acceptor, and additivesindicate that the N۷۱۹ can act as a second donor and Forster resonance energy transfer component inthe final photovoltaic device. The results show more than ۴۰% improvement in power conversionefficiency (PCE) with only ۰.۲۵ wt.% of co-photosensitizers

کلیدواژه ها:

Polymers for Energy Storage and Harvesting ، Polymer Solar Cell ، Graphene QuantumDot ، Quaternary Modulation.