| 초록 |
We synthesized and designed electron acceptors based on 6,6,12,12-tetrakis(3-hexylphenyl)-indacenobis (benzodithiophene) named ETBDTIC and ESTBDTIC,respectively. ESTBDTIC showed more red-shift absorption than ETBDTIC. Fill factor(FF) and short-circuit currentdensity(Jsc) of ESTBDTIC based device were much higher than the FFand Jsc of ETBDTIC, while the ESTBDTIC showed lower open-circuitvoltage(Voc) because it has thioalkyl group so that LUMO levelbecomes deeper. The ESTBDTIC-based device exhibited power conversion efficiency(PCE) of 7.78% with a Jsc of 13.92 mA/cm2, Voc of 0.92 Vand FF of 60.50%; the corresponding values of ETBDTIC-based device were 5.11%,11.24 mA/cm2, 0.96 V, and 47.30%. The charge transport, electronic properties, film morphology, surface energy and crystallinity and photovoltaic characteristics were studied. |
