journal article·2021-02-12Open access

High-Efficiency All-Polymer Solar Cells with Poly-Small-Molecule Acceptors Having π-Extended Units with Broad Near-IR Absorption

Ning Su, Ruijie Ma, Guoping Li, Tao Liu, Liang-Wen Feng, Chenjian Lin, Jianhua Chen, Jun Song, Yiqun Xiao, Junle Qu, Xinhui Lu, Vinod K. Sangwan, Mark C. Hersam, He Yan, Antonio Facchetti, Tobin J. Marks

ACS Energy Letters· Volume 6· Issue 2

Abstract

We report two new poly-small-molecule acceptors, PYN-BDT and PYN-BDTF, which serve, by virtue of their π-extended naphthalene rings, as broad optical cross-section macromolecular absorbers (extending to ∼900 nm; ΔEopticalgap = 1.38 eV) in all-polymer solar cells (APSCs). APSCs fabricated by blending PYN-BDT or PYN-BDTF with PM6 exhibit power conversion efficiencies (PCEs) of 7.24 and 9.08%, respectively, while blends with PBDB-T exhibits far higher PCEs of 12.06 and 13.22%, respectively; the latter cell achieves Jsc = 22.28 mA cm–2, among the highest known for an APSC. The results of blend morphology, GIWAXS, charge transport, exciton and carrier dynamics, PL quenching efficiency, and impedance-based analysis indicate that the PBDB-TT:PYN-BDTF blends and their APSCs outperform the corresponding PM6:PYN-BDTF devices due to significantly suppressed bimolecular recombination. These results demonstrate that π-conjugative extension of individual polymer acceptor blocks represents an efficient strategy to broaden APSC optical cross sections, decrease bimolecular recombination, and achieve high-performance cells with enhanced Jsc metrics.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Perovskite Materials and Applications · Conducting polymers and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Center for Biomedical Optics and Photonics (CBOP) & College of Physics and Optoelectronic Engineering, Key Laboratory of Optoelectronic Devices and Systems, Shenzhen University, Shenzhen 518060, P. R. China

Department of Chemistry, Center for Light Energy-Activated Redox Processes, and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States

Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 999077, China

Department of Physics, Chinese University of Hong Kong, New Territories, Hong Kong 999077, China

Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States

Department of Electrical and Computer Engineering, Northwestern University, Evanston, Illinois 60208, United States

Flexterra Corporation, 8025 Lamon Avenue, Skokie, Illinois 60077, United States

Funding

Basic Energy Sciences · Argonne National Laboratory · National Key R&D Program of China · Guangdong Province Key Area R&D Program · US Office of Naval Research · China Postdoctoral Science Foundation · National Natural Science Foundation of China · (Key) Project of Department of Education of Guangdong Province · National Science Foundation

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