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首页> 外文期刊>Journal of Macromolecular Science. Pure and Applied Chemistry >New Polymers for Optimizing Organic Photovoltaic Cell Performances
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New Polymers for Optimizing Organic Photovoltaic Cell Performances

机译：用于优化有机光伏电池性能的新型聚合物

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The performance of an organic solar cell critically depends on the materials used in the active layer. Desirable characteristics of active layer materials include an intense optical absorption covering broad range of the solar spectrum to maximize photon capture, the ability to effectively separate charges upon photo-excitation, high charge mobility to allow efficient charge transport to the electrodes, and suitable HOMO and LUMO levels to ensure a high device voltage. In order to optimize these properties simultaneously, we have designed and synthesized conjugated polymers containing alternating electron-donating and electron-accepting units. Based on one of the low band gap polymers we designed and synthesized previously, poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b:3,4-b']dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)], we carried out both side chain and main chain modifications in order to improve performance even further. By incorporating fluorene repeating units into the main chain, it is possible to adjust the absorption characteristics of the polymers while maintaining a desirable HOMO level and good charge carrier mobility. The solubility profile of the polymer can be adjusted by modifying the side chains, and soluble polymer with mobility as high as 7×10-2 cm2/Vs is realized when a combination of 2-ethylhexy and hexyl groups are used as side chains. These polymers should be promising candidates for high performance solar cells according to a recently published model (3).
机译：有机太阳能电池的性能关键取决于活性层中使用的材料。活性层材料的理想特性包括：覆盖很宽的太阳光谱范围以最大程度地捕获光子的强光吸收，在光激发时有效分离电荷的能力，高电荷迁移率以允许将电荷有效地传输到电极，以及合适的HOMO和LUMO电平可确保高设备电压。为了同时优化这些性能，我们设计并合成了包含交替的供电子和受电单元的共轭聚合物。基于我们先前设计和合成的一种低带隙聚合物，聚[2,6-（4,4-双-（2-乙基己基）-4H-环戊[2,1-b：3,4-b' [二噻吩] -alt-4,7-（2,1,3-苯并噻二唑）]，我们进行了侧链和主链修饰，以进一步提高性能。通过将芴重复单元结合到主链中，可以在保持所需的HOMO能级和良好的载流子迁移率的同时调节聚合物的吸收特性。可以通过修饰侧链来调节聚合物的溶解度分布，并且当将2-乙基己基和己基的组合用作侧链时，实现了具有高达7×10-2 cm2 / Vs的迁移率的可溶性聚合物。根据最近发布的模型（3），这些聚合物应有望成为高性能太阳能电池的候选材料。

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