| 초록 |
Polymer solar cells have attracted great interest due to their unique advantages, such as low cost, light weight, and potential use in flexible devices. While the power conversion efficiency of polymer photovoltaics exceeding 5 % has been reported, further improvements are still needed for commercial use. The absorption spectra of conjugated polymers typically used as an active material for solar cells exhibit poor overlap with the solar spectrum. To absorb photons at longer wavelengths, where more photon flux from the emission of the sun is found, development of low-bandgap polymer is strongly required. In this study, we have synthesized an low-bandgap alternating copolymer composed of 3-hexylthiophene and thiadiazolo[3,4-g]quinoxaline. The bandgap (1.4 eV) of the copolymer is significantly lower than that (1.9 eV) of P3HT, which has been known as the most efficient electron donor material. Other photophysical properties and photovoltaic performance of the copolymer will be presented. |
