Non-Fully Conjugated Dimerized Giant Acceptors with Different Alkyl-Linked Sites for Stable and 19.13 % Efficiency Organic Solar Cells

Fan Yi; Manjun Xiao; Yongdie Meng; Hairui Bai; Wenyan Su; Wei Gao; Ze-Fan Yao; Guangyu Qi; Zezhou Liang; Conggui Jin; Lingxiao Tang; Rui Zhang; Lihe Yan; Yuhang Liu; Weiguo Zhu; Wei Ma; Qunping Fan

doi:10.1002/anie.202319295

Non-Fully Conjugated Dimerized Giant Acceptors with Different Alkyl-Linked Sites for Stable and 19.13 % Efficiency Organic Solar Cells

Angew Chem Int Ed Engl. 2024 Apr 2;63(14):e202319295. doi: 10.1002/anie.202319295. Epub 2024 Feb 27.

Authors

Fan Yi^{1

2}, Manjun Xiao¹, Yongdie Meng¹, Hairui Bai², Wenyan Su³, Wei Gao⁴, Ze-Fan Yao⁵, Guangyu Qi, Zezhou Liang⁶, Conggui Jin¹, Lingxiao Tang², Rui Zhang⁷, Lihe Yan⁶, Yuhang Liu², Weiguo Zhu⁸, Wei Ma², Qunping Fan²

Affiliations

¹ College of Chemistry, Key Lab of Environment-Friendly Chemistry and Application (Ministry of Education), Xiangtan University, Xiangtan, 411105.
² State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China.
³ School of Materials Science and Engineering, Xi'an University of Science and Technology, Xi'an, 710054, China.
⁴ Xiamen Key Laboratory of Optoelectronic Materials and Advanced Manufacturing, Institute of Luminescent Materials and Information Displays, College of Materials Science and Engineering, Huaqiao University, Xiamen, 361021, China.
⁵ College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.
⁶ Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi, Key Lab of Photonic Technique for Information, School of Electronics Science & Engineering, Faculty of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
⁷ Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, SE-58183, Sweden.
⁸ Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, School of Materials Science and Engineering, Changzhou University, Changzhou, 213164, China.

PMID: 38335036
DOI: 10.1002/anie.202319295

Abstract

Achieving both high power conversion efficiency (PCE) and device stability is a major challenge for the practical development of organic solar cells (OSCs). Herein, three non-fully conjugated dimerized giant acceptors (named 2Y-sites, including wing-site-linked 2Y-wing, core-site-linked 2Y-core, and end-site-linked 2Y-end) are developed. They share the similar monomer precursors but have different alkyl-linked sites, offering the fine-tuned molecular absorption, packing, glass transition temperature, and carrier mobility. Among their binary active layers, D18/2Y-wing has better miscibility, leading to optimized morphology and more efficient charge transfer compared to D18/2Y-core and D18/2Y-end. Therefore, the D18/2Y-wing-based OSCs achieve a superior PCE of 17.73 %, attributed to enhanced photocurrent and fill factor. Furthermore, the D18/2Y-wing-based OSCs exhibit a balance of high PCE and improved stability, distinguishing them within the 2Y-sites. Building on the success of 2Y-wing in binary systems, we extend its application to ternary OSCs by pairing it with the near-infrared absorbing D18/BS3TSe-4F host. Thanks to the complementary absorption within 300-970 nm and further optimized morphology, ternary OSCs obtain a higher PCE of 19.13 %, setting a new efficiency benchmark for the dimer-derived OSCs. This approach of alkyl-linked site engineering for constructing dimerized giant acceptors presents a promising pathway to improve both PCE and stability of OSCs.

Keywords: giant acceptors; molecular engineering; morphology; organic solar cells; power conversion efficiency.

Abstract

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