Rational Molecular Design of Non-fullerene Acceptor towards High-efficiency Polymer Solar Cells
Sunsun Li a, Wenchao Zhao a, Long Ye b, Harald Ade b, Jianhui Hou a
a Institute of Chemistry, Chinese Academy of Sciences (ICCAS), China
b North Carolina State University, Partners Way, 911, Raleigh, United States
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Benidorm, Spain, 2018 May 28th - 31st
Organizers: Emilio Palomares and Rene Janssen
Poster, Sunsun Li, 054
Publication date: 21st February 2018

Polymer solar cells (PSCs) are considered a promising solar technology due to its uniqueadvantages, such as mechanical flexibility, and potential in low-cost solution processing.[1] Recently, the small-molecular electron acceptors (SMAs) with the acceptor-donor-acceptor (A-D-A) structure exhibit superior photovoltaic properties, and enable high power conversion efficiencies (PCEs) in the corresponding PSCs.[2-3] However, the electron mobilities of the A-D-A-type SMAs are still relatively low. In our work, systematic studies indicated that the stacking of the terminal-groups at both ends of the molecule provides the channel for efficient electron transport.[4] Very recent, we proposed to extend the π-conjugation of the terminal-group, and the new SMA (IDTN) exhibits distinctly stronger intermolecular π-π interaction, more ordered packing structure, and thus over one order of magnitude higher electron mobility compared to its counterpart.[5] Benefiting from the improved electron mobility, a record-high fill factor of 0.78 was achieved for the IDTN-based PSC. Moreover, the PCEs of IDTN-based devices with blend film thickness varied from 70 to 300 nm are maintained over 10%, which quite outperforme other polymer:SMA blend systems, and reveal its great potential for large-area manufacturing.

References
[1] G. Li, R. Zhu, Y. Yang, Nat. Photon. 2012, 6, 153-161.
[2] S. Li, L. Ye, W. Zhao, S. Zhang, S. Mukherjee, H. Ade, J. Hou, Adv. Mater. 2016, 28, 9423-9429.
[3] W. Zhao, S. Li, H. Yao, S. Zhang, Y. Zhang, B. Yang, J. Hou, J. Am. Chem. Soc. 2017, 139, 7148-7151.
[4] S. Li, L. Ye, W. Zhao, S. Zhang, H. Ade, J. Hou, Adv. Energy Mater. 2017, 7, 1700183.
[5] S. Li, L. Ye, W. Zhao, X. Liu, J. Zhu, H. Ade, J. Hou, Adv. Mater. 2017, 29, 1704051. 

 

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