journal article·2022-11-11

Synchronous Doping Effects of Cathode Interlayers on Efficient Organic Solar Cells

Zhihui Chen, Yifan Huang, Jiaxin Gao, Lei Zhang, Zaifei Ma, Miao Liu, Todd Emrick, Yao Liu

ACS Energy Letters· Volume 7· Issue 11
Publisher page

Abstract

An in-depth understanding of the role of cathode interlayers in nonfullerene organic solar cells (OSCs) is challenging due to ambiguous and complicated interfacial doping, which complicates molecular designs and hinders progress in optoelectronic performance. Herein, we describe synchronous doping effects (a combination of the cathode interlayer’s self-doping and its doping on acceptors in the active layer) of cathode interlayers. The electronic nature of π-conjugated cores in cathode interlayer materials has a negligible influence on nonfullerene acceptor doping but an obvious influence on their self-doping. A synchronous doping effect generated by the amine-substituted fullerene (C 60 -N), with its electron-withdrawing C 60 core, facilitates interfacial charge transport and collection, affording a remarkable power conversion efficiency > 18% for PM6:L8-BO based OSCs, which is among the highest reported values for binary OSCs. This discovery of synchronous doping on interfacial modification provides new and useful molecular design guidelines for high-performance cathode modifiers in organic electronics.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Molecular Junctions and Nanostructures

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

Affiliations

State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

University of Chinese Academy of Sciences, Beijing 100049, China

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-Dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, China

Polymer Science and Engineering Department, University of Massachusetts Amherst, 120 Governors Drive, Amherst, Massachusetts 01003, United States

Funding

Division of Chemistry · China Postdoctoral Science Foundation · National Natural Science Foundation of China

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