Effect of the triazole ring in zinc porphyrin-fullerene dyads on the charge transfer processes in NiO-based devices.

摘要: Herein, the synthesis of three covalently linked donor–acceptor zinc porphyrin–fullerene (ZnP–C60) dyads (C60trZnPCOOH, C60trZnPtrCOOH and C60ZnPCOOH) is described, their application as sensitizers in NiO-based dye-sensitized solar cells (DSCs) discussed. To best our knowledge, this first example where ZnP–C60 have been used chromophores DSCs. In an effort to examine whether distance chromophore from electron acceptor entity and/or NiO surface affects performance cells, a triazole ring was introduced spacer between ZnP two peripheral units C60 –COOH. The inserted dyad C60trZnPCOOH, whereas both anchoring group were connected through spacers C60trZnPtrCOOH, C60ZnPCOOH did not contain any linker. Photophysical investigation performed by ultrafast transient absorption spectroscopy solution on demonstrated that all exhibited long-lived charge-separated states due shifts reduced porphyrin core C60. experiments showed presence influenced photophysical properties C60trZnPCOOH particular, increased lifetime compared dyad. On other hand, corresponding studies proved has rather moderate impact charge separation (NiO–ZnP˙+–C60˙−) recombination (NiO–3*ZnP–C60) rate constants. All enhanced terms photovoltaic measurements with more than threefold increase reference compound PhtrZnPCOOH which absent. Two different electrolytes examined (I3−/I− CoIII/II) most cases, performance. performing I3−/I− (PCE = 0.076%); CoIII/II, 0.074%).