Conjugated Block Copolymer Photovoltaics with near 3% Efficiency through Microphase Separation
Conjugated Block Copolymer Photovoltaics with near 3% Efficiency through Microphase Separation
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DOI：
10.1021/nl401420s
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发表时间：
2013-06-01
期刊：
影响因子：
10.8
通讯作者：
Verduzco, Rafael
中科院分区：
文献类型：
--
作者：
Guo, Changhe;Lin, Yen-Hao;Verduzco, Rafael
有机电子材料有可能影响现代生活的几乎每一个方面，包括我们如何获取信息，照亮我们的家园，以及为个人电子产品供电。然而，弱的分子间相互作用和不同有机材料的结处的无序限制了有机界面的性能和稳定性，从而限制了有机半导体对电子器件的适用性。在这里，我们展示了通过微相分离的共轭嵌段共聚物控制供体受体异质结。当用作光伏电池的活性层时，基于嵌段共聚物的器件表现出远远超过由均聚物共混物组成的器件的高效光转换。在不使用富勒烯受体的情况下实现了3%的嵌段共聚物器件效率。X射线散射结果表明，嵌段共聚物太阳能电池的显着性能是由于自组装成介观层状形态与主要面对微晶取向。因此，共轭嵌段共聚物提供了通过控制供体受体界面来增强激子太阳能电池性能的途径。
Organic electronic materials have the potential to impact almost every aspect of modern life including how we access information, light our homes, and power personal electronics. Nevertheless, weak intermolecular interactions and disorder at junctions of different organic materials limit the performance and stability of organic interfaces and hence the applicability of organic semiconductors to electronic devices. Here, we demonstrate control of donor acceptor heterojunctions through microphase-separated conjugated block copolymers When utilized as the active layer of photovoltaic cells, block copolymer based devices demonstrate efficient photoconversion well beyond devices composed of homopolymer blends. The 3% block copolymer device efficiencies are achieved without the use of a fullerene acceptor. X-ray scattering results reveal that the remarkable performance of block copolymer solar cells is due to self-assembly into mesoscale lamellar morphologies with primarily face on crystallite orientations. Conjugated block copolymers thus provide a pathway to enhance performance in excitonic solar cells through control of donor acceptor interfaces.