journal article·2024-05

Isomerization of Benzothiadiazole Yields a Promising Polymer Donor and Organic Solar Cells with Efficiency of 19.0%

Tao Lin, Yulong Hai, Yongmin Luo, Lingwei Feng, Tao Jia, Jiaying Wu, Ruijie Ma, Top Archie Dela Peña, Yao Li, Zengshan Xing, Mingjie Li, Min Wang, Biao Xiao, Kam Sing Wong, Shengjian Liu, Gang Li

Advanced Materials· Volume 36· Issue 19
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Abstract

Abstract The exploration of high‐performance and low‐cost wide‐bandgap polymer donors remains critical to achieve high‐efficiency nonfullerene organic solar cells (OSCs) beyond current thresholds. Herein, the 1,2,3‐benzothiadiazole (iBT), which is an isomer of 2,1,3‐benzothiadiazole (BT), is used to design wide‐bandgap polymer donor PiBT. The PiBT‐based solar cells reach efficiency of 19.0%, which is one of the highest efficiencies in binary OSCs. Systemic studies show that isomerization of BT to iBT can finely regulate the polymers’ photoelectric properties including i) increasing the extinction coefficient and photon harvest, ii) downshifting the highest occupied molecular orbital energy levels, iii) improving the coplanarity of polymer backbones, iv) offering good thermodynamic miscibility with acceptors. Consequently, the PiBT:Y6 bulk heterojunction (BHJ) device simultaneously reaches advantageous nanoscale morphology, efficient exciton generation and dissociation, fast charge transportation, and suppressed charge recombination, leading to larger VOC of 0.87 V, higher JSC of 28.2 mA cm−2, greater fill factor of 77.3%, and thus higher efficiency of 19.0%, while the analog‐PBT‐based OSCs reach efficiency of only 12.9%. Moreover, the key intermediate iBT can be easily afforded from industry chemicals via two‐step procedure. Overall, this contribution highlights that iBT is a promising motif for designing high‐performance polymer donors.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications

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

Affiliations

School of Optoelectronic Engineering School of Mechanical Engineering Guangdong Polytechnic Normal University Guangzhou 510665 China

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

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

Department of Electrical and Electronic Engineering Research Institute for Smart Energy (RISE) Photonic Research Institute (PRI) The Hong Kong Polytechnic University Hong Kong 999077 China

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

School of Science Department of Physics Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong 999077 P. R. China

Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education) Flexible Display Materials and Technology Co‐Innovation Centre of Hubei Province School of Optoelectronic Materials & Technology Jianghan University (JHUN) Wuhan 430056 China

School of Chemistry Guangzhou Key Laboratory of Materials for Energy Conversion and Storage Key Laboratory of Electronic Chemicals for Integrated Circuit Packaging South China Normal University (SCNU) Guangzhou 510006 China

Funding

Natural Science Foundation of Guangdong Province · Guangzhou Municipal Science and Technology Project · National Natural Science Foundation of China

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