journal article·2023-06Open access

An Isomeric Solid Additive Enables High‐Efficiency Polymer Solar Cells Developed Using a Benzo‐Difuran‐Based Donor Polymer

Lu Chen, Jicheng Yi, Ruijie Ma, Lu Ding, Top Archie Dela Peña, Heng Liu, Jian Chen, Cuifen Zhang, Chaoyue Zhao, Wen Lu, Qi Wei, Bin Zhao, Huawei Hu, Jiaying Wu, Zaifei Ma, Xinhui Lu, Mingjie Li, Guangye Zhang, Gang Li, He Yan

Advanced Materials· Volume 35· Issue 26

Abstract

Abstract Currently, nearly all high‐efficiency organic photovoltaic devices use donor polymers based on the benzo‐dithiophene (BDT) unit. To diversify the choices of building blocks for high‐performance donor polymers, the use of benzo‐difuran (BDF) units is explored, which can achieve reduced steric hindrance, stronger molecular packing, and tunable energy levels. In previous research, the performance of BDF‐based devices lagged behind those of BDT‐based devices. In this study, a high efficiency (18.4%) is achieved using a BDF‐based polymer donor, which is the highest efficiency reported for BDF donor materials to date. The high efficiency is enabled by a donor polymer (D18‐Fu) and the aid of a solid additive (2‐chloronaphthalene), which is the isomer of the commonly used additive 1‐chloronaphthalene. These results revealed the significant effect of 2‐chloronaphthalene in optimizing the morphology and enhancing the device parameters. This work not only provides a new building block that can achieve an efficiency comparable to dominant BDT units but also proposes a new solid additive that can replace the widely used 1‐chloronaphthalene additive.
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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

College of New Materials and New Energies Shenzhen Technology University Shenzhen 518118 P. R. China

Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science and Technology Clear Water Bay Hong Kong 999077 P. R. China

Department of Electronic and Information Engineering Research Institute for Smart Energy (RISE) Guangdong‐Hong Kong‐Macao (GHM) Joint Laboratory for Photonic‐Thermal‐Electrical Energy Materials and Devices The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong 999077 P. R. China

Hong Kong University of Science and Technology Fok Ying Tung Research Institute S&T Building Nansha IT Park Guangzhou City 511458 P. R. China

Department of Applied Physics The Hong Kong Polytechnic University Hong Kong 999077 P. R. China

The Hong Kong University of Science and Technology Function Hub Advanced Materials Thrust Nansha Guangzhou 511400 P. R. China

Department of Physics The Chinese University of Hong Kong Shatin Hong Kong 999077 P. R. 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 P. R. China

Key Laboratory of Polymeric Materials & Application Technology of Hunan Province College of Chemistry Xiangtan University Xiangtan 411105 P. R. China

eFlexPV Limited (Foshan) Guicheng Street, Nanhai District Foshan 528200 P. R. China

Funding

National Natural Science Foundation of China · National Key Research and Development Program of China · Shenzhen Fundamental Research Program

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