On the role of local charge carrier mobility in the charge separation mechanism of organic photovoltaics
On the role of local charge carrier mobility in the charge separation mechanism of organic photovoltaics
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局部电荷载流子迁移率在有机光伏电荷分离机制中的作用
DOI：
10.1039/c5cp01604e
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
and S. Seki
中科院分区：
文献类型：
--
作者：
S. Yoshikawa;A. Saeki;M. Saito;I. Osaka;and S. Seki
虽然电荷分离（CS）和输运过程与双生和非双生重组竞争，通常被认为是有机光伏（OPV）效率的控制因素，但CS机制的细节仍未被探索。本文系统地研究了十种不同的低带隙聚合物和聚噻吩类似物与甲烷富勒烯（PCBM）混合的体异质结薄膜中局部载流子迁移率的作用。通过与OPV性能的关联，我们证明了由时间分辨微波电导率测量的共混物的局部迁移率比纯聚合物的局部迁移率对OPV输出更重要。此外，结果揭示了晶体和半晶体聚合物的两种不同趋势。这项工作为高性能有机太阳能电池的设计提供了指导。
Although the charge separation (CS) and transport processes that compete with geminate and non-geminate recombination are commonly regarded as the governing factors of organic photovoltaic (OPV) efficiency, the details of the CS mechanism remain largely unexplored. Here we provide a systematic investigation on the role of local charge carrier mobility in bulk heterojunction films of ten different low-bandgap polymers and polythiophene analogues blended with methanofullerene (PCBM). By correlating with the OPV performances, we demonstrated that the local mobility of the blend measured by time-resolved microwave conductivity is more important for the OPV output than those of the pure polymers. Furthermore, the results revealed two separate trends for crystalline and semi-crystalline polymers. This work offers guidance in the design of high-performance organic solar cells.