Exciton Diffusion in Conjugated Polymers: From Fundamental Understanding to Improvement in Photovoltaic Conversion Efficiency
Exciton Diffusion in Conjugated Polymers: From Fundamental Understanding to Improvement in Photovoltaic Conversion Efficiency
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DOI：
10.1021/acs.jpclett.5b01147
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发表时间：
2015-09-03
影响因子：
5.7
通讯作者：
Ito, Shinzaburo
中科院分区：
文献类型：
--
作者：
Tamai, Yasunari;Ohkita, Hideo;Ito, Shinzaburo
单线态激子扩散在有机光伏（OPV）的光伏转换中发挥着核心作用。吸收光后，由于有机材料的介电常数（epsilon(r)）很小（类似于3-4），因此在有机材料中迅速产生单线态激子而不是载流子，这与无机和钙钛矿太阳能电池形成鲜明对比。为了转化为电荷载流子，激子需要扩散到电子供体和受体材料之间的界面中，然后再失活到基态。因此，对激子扩散动力学的基本理解是进一步改进 OPV 的最重要问题之一。我们重点介绍了该领域最近的领先研究，并描述了在 OPV 界面处有效收集激子的几种方法。
Singlet exciton diffusion plays a central role in the photovoltaic conversion in organic photovoltaics (OPVs). Upon light absorption, singlet excitons are promptly generated in organic materials instead of charge carriers because the dielectric constant (epsilon(r)) is small (similar to 3-4), which is in sharp contrast to inorganic and perovskite solar cells. In order to convert to charge carriers, excitons need to diffuse into an interface between electron donor and acceptor materials before deactivating to the ground state. Therefore, fundamental understanding of exciton diffusion dynamics is one of the most important issues to further improve OPVs. We highlight recent leading studies in this field and describe several approaches for efficient exciton harvesting at the interface in OPVs.