A p-i-n organic photovoltaic cell with tetrabenzoporphyrin (BP), a BP-C₆₀ dyad and PCBM for the p-, i- and n-layers, respectively, gave a better fill factor and power conversion efficiency than the corresponding p-i-n cell having a 1:1 blend film of BP and PCBM as the i-layer.
The thermal conversion behavior of a benzoporphycene precursor (BPc-pre) and the film formation of benzoporphycene (BPc) in the presence of [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) were reported. As-spun BPc-pre/PCBM films were prepared from a dichloromethane solution, and BPc-pre was converted into BPc by annealing. Both BPc and PCBM crystallized independently and PCBM crystals dramatically inhibited the aggregation of BPc, resulting in a phase-separated structure.
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