journal article·2024-08Open access

Strengthening Near‐Infrared Photon Harvesting in Semi‐Transparent All‐Polymer Solar Cells through the Synergy of Fluorination on the Selenide Monomer Backbone

Wei Liu, Han Yu, Baoze Liu, Yan Wang, Huawei Hu, Ho Ming Ng, Chung Hang Kwok, Jicheng Yi, Chen Zhang, Fei Huang, Zonglong Zhu, He Yan

Advanced Functional Materials· Volume 34· Issue 33

Abstract

Abstract All‐polymer solar cells (all‐PSCs) offer promising potential for large‐scale manufacturing due to their remarkable mechanical and thermal stability. However, the limited capacity of polymer acceptors for near‐infrared (NIR) photon harvesting has impeded their progress in semi‐transparent (ST) all‐PSCs. Here, the study develops a pair of new NIR polymer acceptors, named PYSeF‐T and PYSe2F‐T, with mono‐/di‐fluorinated end groups capped to the selenide monomer backbone, respectively. Owing to the stronger intermolecular interaction and intramolecular charge transfer effect of the di‐fluorinated end groups with the selenide backbone, PYSe2F‐T exhibits a stronger crystallinity and a more bathochromic absorption to 1000 nm. When blended with the donor, PM6, the PY2SeF‐T‐based all‐PSC demonstrates a higher efficiency of 16.73% with a remarkable short‐circuit current (JSC) of 27.7 mA cm−2, which is the highest JSC for all‐PSCs. Based on these, the ST device based on PM6:PYSe2F‐T demonstrates a superior efficiency of 12.52% with an average visible transmittance of 26.2% and a light utilization efficiency of 3.28%, outperforming the mono‐fluorinated counterpart. The work provides an in‐depth understanding of the above synergistic effects to develop NIR polymer acceptors and establishes a solid foundation for future investigations into large‐area and flexible ST all‐PSCs.
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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

Guangdong‐Hong Kong Joint Laboratory for Carbon Neutrality Jiangmen Laboratory of Carbon Science and Technology Jiangmen Guangdong 529199 China

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

Hong Kong University of Science and Technology‐Shenzhen Research Institute No. 9, Yuexing 1st RD, Hi‐tech Park, Nanshan Shenzhen 518057 China

Department of Chemistry Hong Kong Institute for Clean Energy City University of Hong Kong Kowloon Hong Kong 999077 China

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai 201620 China

Department of Computing The Hong Kong Polytechnic University 11 Yuk Choi Road, Hung Hom Kowloon Hongkong 999077 China

Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 China

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

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China · Shenzhen Fundamental Research Program · Zhongshan Science and Technology Bureau · Basic and Applied Basic Research Foundation of Guangdong Province · Innovation and Technology Commission

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