| 초록 |
PPV derivatives, polymers with vinylene units, have their tendency to exhibit degradation, after irradiation with white light or operation of the device, resulting in the appearance of a shifted absorption and emission band in the short wavelength regions of the spectra. The structure of the repeating unit in poly(5,5,10,10-tetrakis(2-ethylhexyl)-5,10-dihydroindeno [2,1-a]indene-2,7-diyl) (PININE) can prevent the oxidation of the vinylene units. Low band gap conjugated polymers with proper energy levels for charge transfer are required to achieve high-efficiency polymer solar cells. We have synthesized new conjugated polymers using indenoindene and benzimidazole with dithiophene as the building block. Since the copolymers including indenoindene and benzimidazole units have stable backbone, high solubility and low band gap, they can be utilized as efficient electron-donating materials for the photovoltaic devices. |
