| 초록 |
We designed a novel pyrrolopyridine unit, in which the 'N' atom was substituted instead of the 'C' atom in the indoloindole moiety for the new building block for the organic electronics. The new D-A copolymers, PDHPHBT, PDHPFBT, and PDHP2FBT were synthesized using new donor unit and benzothiadiazole derivatives containing 'F' atoms as the acceptor. Introduction of the pyridine moiety into the donor had a greater effect on decreasing the HOMO than the LUMO level, and led to a deeper HOMO level and slightly wider bandgap than seen for the indoloindole unit. As the number of F atoms increased in the donor unit of the polymer, the HOMO level deepened and the VOC increased from 0.83 to 0.90 V. PCE values of 1.54%, 5.09%, and 1.38% were obtained for the 0F, 1F, and 2F devices, respectively. Addition of 3 vol% DPE increased the smoothness of the film surface and improved the device efficiency up to 5.38%, 5.68%, and 3.80% for the devices based on PDHPHBT, PDHPFBT, and PDHP2FBT, respectively. |
