Designing Acceptor Polymers for Organic Photovoltaic Devices
Designing Acceptor Polymers for Organic Photovoltaic Devices
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DOI：
10.1021/jp110990w
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发表时间：
2011-02-24
影响因子：
3.7
通讯作者：
Janssen, Rene A. J.
中科院分区：
文献类型：
--
作者：
Falzon, Marie-France;Wienk, Martijn M.;Janssen, Rene A. J.
有机光伏领域的挑战之一是开发富勒烯衍生物家族的替代品，这些衍生物通常用作受体材料，但通常缺乏强的光学吸收系数。我们描述了三种新型受体电子受体聚合物的合成和光电特性，这些聚合物使用噻吩单元和缺电子单元的交替作为共同的设计主题。受体聚合物与聚（3-己基噻吩）结合作为本体异质结太阳能电池中的电子供体材料。光伏器件的性能受到不完全激子解离以及低场下光生电子和空穴分离缓慢的限制。这种分离与电荷复合到三重态是竞争的。此外，受体聚合物中的低电子迁移率阻碍了电荷收集。
One of the challenges in the field of organic photovoltaics is developing alternatives to the family of fullerene derivatives that are commonly used as acceptor material but that generally lack strong optical absorption coefficient. We describe the synthesis and optoelectronic properties of three new acceptor electron acceptor polymers that use the alternation of thiophene units and electron-deficient units as a common design theme. The acceptor polymers are combined with poly(3-hexylthiophene) as electron donor material in bulk heterojunction solar cells. The performance of the photovoltaic devices is limited by incomplete exciton dissociation and a sluggish separation of the photogenerated electrons and holes at low fields. The separation is in competition with charge recombination to the triplet state. In addition, the low electron mobility in the acceptor polymers hampers charge collection.