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Tuning of the Photovoltaic Parameters of Molecular Donors by Covalent Bridging

机译:通过共价桥接调整分子供体的光伏参数

摘要

The synthesis of donor-acceptor molecules involving triarylamines and dicyanovinyl blocks is described. Optical and electrochemical results show that rigidification of the acceptor part of the molecule by a covalent bridge leads to a ca. 0.20 eV increase of the band gap due to a parallel increase of the lowest unoccupied molecular orbital level. A preliminary evaluation of these compounds as donor materials in organic solar cells shows that although this structural modification reduces the light-harvesting properties of the donor molecule, it nevertheless induces an increase of the efficiency of the resulting solar cells due to a simultaneous improvement of the open-circuit voltage and fill factor.
机译:描述了涉及三芳基胺和双氰基乙烯基嵌段的供体-受体分子的合成。光学和电化学结果表明,通过共价桥对分子的受体部分进行的刚性化导致ca。由于最低未占据分子轨道水平的平行增加,带隙增加了0.20 eV。对这些化合物作为有机太阳能电池中的施主材料的初步评估表明,尽管这种结构修饰降低了施主分子的集光性能,但由于同时提高了太阳能电池的效率,它还是导致了所得太阳能电池效率的提高。开路电压和填充系数。

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