Relationship between Energetic Disorder and Reduced Recombination of Free Carriers in Organic Solar Cells,Advanced Energy Materials

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Relationship between Energetic Disorder and Reduced Recombination of Free Carriers in Organic Solar Cells
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-01-05 , DOI: 10.1002/aenm.202203576
Seyed Mehrdad Hosseini ₁ , Sebastian Wilken ₂ , Bowen Sun ₁ , Fei Huang ₃ , Sang Young Jeong ₄ , Han Young Woo ₄ , Veaceslav Coropceanu ₅ , Safa Shoaee ₁

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Reducing non-radiative recombination is key to achieve high fill factors (FFs) in organic solar cells. While it is generally accepted that recombination proceeds via charge transfer (CT) states at the donor:acceptor interface, the underlying principles that dictate the decay kinetics of these CT states are not yet well understood. Here, a study on the effect of energetic disorder is presented. Based on a data set of 10 representative donor:acceptor blends, clear correlations between disorder, the recombination coefficient of free charge carriers, and the non-radiative voltage loss are found. It is suggested that a narrower distribution of CT energies leads to a longer CT decay time and thus reduces non-radiative losses. This leads to a simultaneous improvement of the FF and open circuit voltage and highlights the importance of having materials with low energetic disorder on the way to the commercialisation of organic photovoltaics.

中文翻译：

有机太阳能电池中能量紊乱与自由载流子复合减少的关系

减少非辐射复合是在有机太阳能电池中实现高填充因子 (FF) 的关键。虽然人们普遍认为重组通过供体：受体界面处的电荷转移 (CT) 状态进行，但尚未完全了解决定这些 CT 状态衰变动力学的基本原理。此处介绍了一项关于能量障碍影响的研究。基于 10 个代表性供体：受体混合物的数据集，发现无序、自由电荷载流子的复合系数和非辐射电压损失之间存在明显的相关性。建议更窄的 CT 能量分布导致更长的 CT 衰减时间，从而减少非辐射损失。

更新日期：2023-01-05

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