Abstract

Two C 60 derivatives, biindene-C 60 monoadduct (BC 60MA) and biindene-C 60 bisadduct (BC 60BA), were synthesized by an one-pot reaction of 1, 1′-biindene and C 60, for the application as acceptor materials in Polymer Solar Cells (PSCs). The two C 60 derivatives possess good solubility in toluene and o-dichlorobenzene, and the solubility of BC 60BA is even better than that of BC 60MA. The electrochemical properties and the LUMO energy levels of the two fullerene derivatives were investigated by cyclic voltammetry. The LUMO energy levels of BC 60MA and BC 60BA were 0.06 and 0.17 eV higher (up-shifted) than that of PCBM, respectively. The PSCs based on P3HT as donor and BC 60MA or BC 60BA as acceptor exhibited higher V oc of 0.68 and 0.82 V, respectively, which is benefited from the higher LUMO energy levels of the C 60 derivatives. The power conversion efficiency of the PSC based on P3HT/BC 60MA was 2.21% after annealing at 140 °C for 5 min.

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