| 초록 |
It is a requirement for high-performance bulk-heterojunction organic solar cells to investigate the interfacial effect on photogenerated holes and electrons transfer. As it is known, the smooth transfer can be achieved by decreasing the Schottky barrier. Herein, we investigated the association of alkyl chain length in the electrolytes, 1,1'-bis(1-alkyl)-4,4′-bipyridine-1,1′-diium benzenesulfonate (V-butyl-2OTs, V-hexyl-2OTs, and V-dodecyl-2OTs). The power conversion efficiencies (PCEs) and the Schottky barrier of the electrolytes were calculated to 8.1%/0.37, 8.3%/0.30, and 8.6%/0.23, respectively, where the Schottky barrier was induced from the difference between acceptor material’s LUMO and electrode. The obvious correlation was found between the PCE and the Schottky barrier. The photogenerated current density which well-matched with the decreasing of the Schottky barrier by the interfacial dipole from the |
