Small reorganization energy acceptors enable low energy losses in non-fullerene organic solar cells

Yanan Shi, Yilin Chang, Kun Lu (), Zhihao Chen, Jianqi Zhang, Yangjun Yan, Dingding Qiu, Yanan Liu, Muhammad Abdullah Adil, Wei Ma, Xiaotao Hao (), Lingyun Zhu () and Zhixiang Wei ()
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Yanan Shi: National Center for Nanoscience and Technology
Yilin Chang: National Center for Nanoscience and Technology
Kun Lu: National Center for Nanoscience and Technology
Zhihao Chen: Shandong University
Jianqi Zhang: National Center for Nanoscience and Technology
Yangjun Yan: National Center for Nanoscience and Technology
Dingding Qiu: National Center for Nanoscience and Technology
Yanan Liu: National Center for Nanoscience and Technology
Muhammad Abdullah Adil: National Center for Nanoscience and Technology
Wei Ma: Xi’an Jiaotong University
Xiaotao Hao: Shandong University
Lingyun Zhu: National Center for Nanoscience and Technology
Zhixiang Wei: National Center for Nanoscience and Technology

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Minimizing energy loss is of critical importance in the pursuit of attaining high-performance organic solar cells. Interestingly, reorganization energy plays a crucial role in photoelectric conversion processes. However, the understanding of the relationship between reorganization energy and energy losses has rarely been studied. Here, two acceptors, Qx-1 and Qx-2, were developed. The reorganization energies of these two acceptors during photoelectric conversion processes are substantially smaller than the conventional Y6 acceptor, which is beneficial for improving the exciton lifetime and diffusion length, promoting charge transport, and reducing the energy loss originating from exciton dissociation and non-radiative recombination. So, a high efficiency of 18.2% with high open circuit voltage above 0.93 V in the PM6:Qx-2 blend, accompanies a significantly reduced energy loss of 0.48 eV. This work underlines the importance of the reorganization energy in achieving small energy losses and paves a way to obtain high-performance organic solar cells.

Date: 2022
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DOI: 10.1038/s41467-022-30927-y

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