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为了不断提高聚合物太阳能电池的光电转化效率,研究人员设计并合成了种类众多的给/受体单元来制备共轭聚合物材料.其中,基于苯并[1.2-b:4,5-b′]二噻吩(BDT)单元的聚合物材料在有机太阳能电池器件中取得了十分突出的光电转化效率,显示了巨大的应用前景.相比于柔性侧基(如烷氧基或烷基)取代的BDT单元而言,基于二维共轭结构BDT的共轭聚合物通常有更好的热稳定性,更宽的吸收光谱,较低的HOMO能级以及更高的空穴迁移率,因而表现出更加优异的光伏性能,最近报道的由二维共轭BDT单元共聚物制备的聚合物太阳能电池可以获得10%以上的光电转化效率.本文首先简要介绍了二维共轭结构BDT单元的合成方法,然后总结了近年来基于二维共轭结构BDT单元的共轭聚合物及其在太阳能电池中的应用.
In order to continuously improve the photoelectric conversion efficiency of polymer solar cells, the researchers designed and synthesized a wide variety of donor / acceptor units for the preparation of conjugated polymer materials, of which benzo [1.2-b: 4,5-b ’ ] Dithiophene (BDT) units have shown great promise in the field of organic solar cell devices, and have shown great promise in applications.Compared to flexible side groups (such as alkoxy or alkyl) substituted BDT units, BDT-based conjugated polymers based on two-dimensional conjugates generally exhibit better thermal stability, broader absorption spectra, lower HOMO energy levels, and higher hole mobility and thus exhibit More excellent photovoltaic properties, the recently reported polymer solar cells prepared by two-dimensional conjugated BDT copolymer can obtain more than 10% photoelectric conversion efficiency.This paper first briefly introduced the synthesis of two-dimensional conjugated BDT unit structure, Then we summarize the conjugated polymers based on BDT units with two-dimensional conjugate structure in recent years and their applications in solar cells.