4.7 Article

Density-of-state engineering of conjugated polymers by implanting partial two-dimensional conjugation: Broad absorption and high performing organic photovoltaics

期刊

CHEMICAL ENGINEERING JOURNAL
卷 478, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2023.147250

关键词

Conjugated polymers; Organic photovoltaics; 2D conjugations; Light-harvesting capabilities; Density of states

向作者/读者索取更多资源

Introducing additional conjugation in conjugated polymers alters their absorption spectrum, resulting in uniform and broad absorption characteristics. When blended with a non-fullerene acceptor that absorbs light in the near-infrared region, the blend achieves uniform light-harvesting capabilities from visible to near-infrared regions, leading to enhanced power conversion efficiency.
Uniform and broad absorption characteristics are fundamental for improving the light-harvesting capabilities of organic photovoltaics (OPVs). A partial two-dimensional (2D) conjugated structure is formed by introducing additional conjugation in the transverse direction of the main backbone of conjugated polymers (CPs). This alters the bimodal-shaped absorption spectrum of typical donor-acceptor CPs to a trimodal-shaped profile by modulating the density of energy states, enabling uniform absorption characteristics in the visible region. The uniform and broad absorption properties of CPs can be confirmed by the proportional improvement in the short-circuit current density (J(SC)) and external quantum efficiency (EQE) in OPVs. In particular, when a CP with modified absorption characteristics is blended with a non-fullerene acceptor (Y6) that can absorb light in the near-infrared (NIR) region, the CP:Y6 blend exhibits a uniform light-harvesting capability from the visible to NIR regions through complementary absorption between the CP and Y6. This results in a promising power-conversion efficiency (PCE) of 16.13 % with a J(SC) of 27.83 mA center dot cm(-2) and fill factor (FF) of 75.22 %. Finally, the morphological effects that determine the charge-recombination properties of the CP:Y6 blends are systematically characterized. The results confirm that the film morphology, in which small domains are uniformly formed, partly contributes to FF enhancement.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据