Mastering morphology of non-fullerene acceptors towards long-term stable organic solar cells

Kang An, Wenkai Zhong, Feng Peng, Wanyuan Deng, Ying Shang, Huilei Quan, Hong Qiu, Cheng Wang, Feng Liu, Hongbin Wu, Ning Li (), Fei Huang () and Lei Ying ()
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Kang An: South China University of Technology
Wenkai Zhong: South China University of Technology
Feng Peng: South China Institute of Collaborative Innovation
Wanyuan Deng: South China University of Technology
Ying Shang: South China University of Technology
Huilei Quan: South China University of Technology
Hong Qiu: South China University of Technology
Cheng Wang: Advanced Light Source Lawrence Berkeley National Laboratory
Feng Liu: Shanghai Jiao Tong University
Hongbin Wu: South China University of Technology
Ning Li: South China University of Technology
Fei Huang: South China University of Technology
Lei Ying: South China University of Technology

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Despite the rapid progress of organic solar cells based on non-fullerene acceptors, simultaneously achieving high power conversion efficiency and long-term stability for commercialization requires sustainable research effort. Here, we demonstrate stable devices by integrating a wide bandgap electron-donating polymer (namely PTzBI-dF) and two acceptors (namely L8BO and Y6) that feature similar structures yet different thermal and morphological properties. The organic solar cell based on PTzBI-dF:L8BO:Y6 could achieve a promising efficiency of 18.26% in the conventional device structure. In the inverted structure, excellent long-term thermal stability over 1400 h under 85 °C continuous heating is obtained. The improved performance can be ascribed to suppressed charge recombination along with appropriate charge transport. We find that the morphological features in terms of crystalline coherence length of fresh and aged films can be gradually regulated by the weight ratio of L8BO:Y6. Additionally, the occurrence of melting point decrease and reduced enthalpy in PTzBI-dF:L8BO:Y6 films could prohibit the amorphous phase to cluster, and consequently overcome the energetic traps accumulation aroused by thermal stress, which is a critical issue in high efficiency non-fullerene acceptors-based devices. This work provides insight into understanding non-fullerene acceptors-based organic solar cells for improved efficiency and stability.

Date: 2023
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DOI: 10.1038/s41467-023-38306-x

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