journal article·2025-01-10

Molecular Cross-Linking Enhances Stability of Non-Fullerene Acceptor Organic Photovoltaics

Sangcheol Yoon, Braulio Reyes-Suárez, Sang T. Pham, Hervé Vezin, Yeny A. Tobon, Myeongjae Lee, Sam Mugiraneza, Brian Minki Kim, Mariane Yuka Tsubaki Oide, Seongju Yoo, Seunggu Lee, Shu Hui Wang, Sean M. Collins, Christopher M. Bates, Yongsup Park, BongSoo Kim, G. N. Manjunatha Reddy, Thuc-Quyen Nguyen

ACS Energy Letters· Volume 10· Issue 1
Publisher page

Abstract

Understanding efficiency–durability relationships and related mitigation strategies is an important step toward the commercialization of organic photovoltaics (OPVs). Here, we report that a photoactivated 6-bridged azide cross-linker (6Bx) improves the morphological stability by suppressing the thermally activated diffusion of (Y6) acceptor molecules in PM6:Y6 bulk-heterojunction (BHJ)-based OPVs. Cross-linked PM6:Y6 (0.05 wt % 6Bx) BHJ OPVs retain 93.4% of the initial power conversion efficiency upon thermal aging at 85 °C for 1680 h ( T 80 = 3290 h). Molecular origins of enhanced thermal stability are corroborated by optical spectroscopy, surface imaging, 2D solid-state nuclear magnetic resonance (ssNMR), Raman spectroscopy, scanning electron diffraction (SED) measurements, and analysis of the BHJ thin films. The facile single-step cross-linking strategy in conjugation with advanced characterization methods presented in the study paves the way toward developing durable OPVs based on non-fullerene acceptors (NFAs).
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Research context

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

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

Affiliations

Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California Santa Barbara (UCSB), Santa Barbara, California 93106, United States

University of Lille, CNRS, Centrale Lille Institut, Université d’Artois, UMR 8181, Unité de Catalyse et Chimie du Solide, Lille F-59000, France

Bragg Centre for Materials Research & School of Chemical and Process Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, United Kingdom

University of Lille, CNRS UMR 8516 − LASIRE − Laboratoire de Spectroscopie pour les Interactions la Réactivité et l’Environnement, Lille 59000, France

Department of Metallurgical and Materials Engineering, University of São Paulo, São Paulo 05508-030, Brazil

Department of Physics, Department of Information Display, Research Institute of Basic Sciences, Kyung Hee University, Seoul 02447, Republic of Korea

School of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, United Kingdom

Department of Materials, Department of Chemistry and Biochemistry, Department of Chemical Engineering, University of California Santa Barbara (UCSB), Santa Barbara, California 93106, United States

Funding

Samsung · Engineering and Physical Sciences Research Council · Korea Basic Science Institute · H2020 Marie Sklodowska-Curie Actions · Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico · Office of Naval Research · Materials Research Science and Engineering Center, Northwestern University · Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior · Division of Materials Research

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