Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
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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