New solution processed bulk-heterojunction organic solar cells based on a triazine-bridged porphyrin dyad as electron donor

摘要: An unsymmetrical porphyrin dyad (ZnP)-[triazine-Npip]-(ZnPCOOH) or P-tNp-P′ consisting of two zinc-metallated units covalently linked through their peripheral aryl-amino groups to a central triazine group, which an N-piperidine group is also attached, has been used in combination with PC71BM ([6,6]-phenyl C71 butyric acid methyl ester) as electron donor and acceptor, respectively, for the active layer solution-processed bulk hetero-junction (BHJ) organic solar cells. The photophysical properties blend films, well cyclic voltammetry measurements dyad, suggest that can effectively harvest photons transfer electrons PC71BM. BHJ cell based on P-tNp-P′ : PC71BM 1 : 1 weight ratio processed from THF resulted power conversion efficiency (PCE) 2.91%. A significant improvement overall photovoltaic was achieved up 4.16% when 3% v/v mixture pyridine THF. This ascribed enhancement short circuit current Jsc cell, related different surface morphology upon addition pyridine. pyridine-modified exhibits higher degree crystallinity, confirmed by X-ray diffraction pattern AFM images corresponding film, results increase exciton dissociation more balanced charge transport.