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Adv Mater. 2019 Apr;31(14):e1808356. doi: 10.1002/adma.201808356. Epub 2019 Feb 19.

Achieving Over 15% Efficiency in Organic Photovoltaic Cells via Copolymer Design.

Cui Y1,2, Yao H1, Hong L1,2, Zhang T1, Xu Y1,2, Xian K1,2, Gao B1,2, Qin J1,2, Zhang J3, Wei Z3, Hou J1,2.

Author information

1
State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
2
School of Chemistry and Chemical Engineering, University of Chinses Academy of Sciences, Beijing, 100049, P. R. China.
3
Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing, 100190, P. R. China.

Abstract

Ternary blending and copolymerization strategies have proven advantageous in boosting the photovoltaic performance of organic solar cells. Here, 15% efficiency solar cells using copolymerization donors are demonstrated, where the electron-withdrawing unit, ester-substituted thiophene, is incorporated into a PBDB-TF polymer to downshift the molecular energy and broaden the absorption. Copolymer-based solar cells suitable for large-area devices can be fabricated by a blade-coating method from a nonhalogen and nonaromatic solvent mixture. Although ternary solar cells can achieve comparable efficiencies, they are not suitable for environment-friendly processing conditions and show relatively low photostability compared to copolymer-based devices. These results not only demonstrate high-efficiency organic photovoltaic cells via copolymerization strategies but also provide important insights into their applications in practical production.

KEYWORDS:

blade coating; copolymers; organic photovoltaic cells; photostability; power conversion efficiency

PMID:
30779391
DOI:
10.1002/adma.201808356

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