Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Previously studies[1] have shown that polythiophenes with conjugated side chains have merits of broad absorption spectrum, good hole mobility and low-lying HOMO energy level. In this study, we further demonstrate that the spatial arrangement of conjugated side chains is a key factor affecting the optical properties, molecular packing behavior, and photovoltaic characteristicsof such two-dimensional polymers.Two novel polythiophenes with terthiophene-vinylene (TTV) side chains, which is either horizontally (PBTTTV-h) or vertically (PBTTTV-v) grafted to the backbone, were synthesizedto investigate the structure-properties relationship. Both polymers show good solubility in common organic solvents and low-lying HOMO energy level. However, the PBTTTV-h displays two distinct UV-Vis absorption peaks and one sharp X-ray diffraction peak;on the other hand, the PBTTTV-v displays a single broad absorption peak and no detectable crystalline peak. As a result, the hole mobility is higher for the former than for the latter. Also, the bulk-heterojunction solar cell fabricated from PBTTTV-h/PC[70]BM exhibits a power conversion efficiency of 4.75 % greater than that (4.00 %) of the PBTTTV-h/PC[70]BM device.
[1] Kuo, C.-Y.; Huang, Y.-C.; Hsiow, C.-Y.; Yang, Y.-W.; Huang, C.-I.; Rwei, S.-P.; Wang, H.-L.; Wang, L., Effect of Side-Chain Architecture on the Optical and Crystalline Properties of Two-Dimensional Polythiophenes. Macromolecules 2013, 46, 5985-5997.
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