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  • Synthesis, optical and elec...
    Vijay Kumar, Challuri; Cabau, Lydia; Koukaras, Emmanuel N; Sharma, Ganesh D; Palomares, Emilio

    Nanoscale, 01/2015, Letnik: 7, Številka: 1
    Journal Article

    A conjugated acceptor-donor-acceptor (A-π-D-π-A) with the Zn-porphyrin core and the di-cyanovinyl substituted thiophene (A) connected at meso positions denoted as VC62 was designed and synthesized. The optical and electrochemical properties of VC62 were investigated. This new porphyrin exhibits a broad and intense absorption in the visible and near infrared regions. Bulk-heterojunction (BHJ) solution processed organic solar cells based on this porphyrin, as electron donor material, and PC71BM (6,6-phenyl C 71 butyric acid methyl ester), as electron acceptor material, were fabricated using THF and a pyridine-THF solvent exhibiting a power conversion efficiency of 3.65% and 5.24%, respectively. The difference in efficiencies is due to the enhancement of the short circuit current J sc and FF of the solar cell, which is ascribed to a stronger and broader incident photon to current efficiency (IPCE) response and a better balanced charge transport in the device processed with the pyridine-THF solvent. A conjugated acceptor-donor-acceptor with a Zn-porphyrin core and di-cyanovinyl substituted thiophene connected at meso positions was designed, synthesized and used in BHJ solar cells. The PCE of the devices reached 5.24%.