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Dimer Acceptor Adopting a Flexible Linker for Efficient and Durable Organic Solar Cells |
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| Authors: | Feng Qi Dr. Yanxun Li Dr. Rui Zhang Dr. Francis R. Lin Dr. Kaikai Liu Dr. Qunping Fan Prof. Alex K.-Y. Jen |
| Affiliation: | 1. Department of Chemistry, City University of Hong Kong, 999077 Kowloon, Hong Kong Hong Kong Institute for Clean Energy, City University of Hong Kong, 999077 Kowloon, Hong Kong These authors contributed equally to this work.;2. Department of Materials Science and Engineering, City University of Hong Kong, 999077 Kowloon, Hong Kong Hong Kong Institute for Clean Energy, City University of Hong Kong, 999077 Kowloon, Hong Kong These authors contributed equally to this work.;3. Department of Physics, Chemistry and Biology (IFM), Linköping University, 58183 Linköping, Sweden;4. Department of Chemistry, City University of Hong Kong, 999077 Kowloon, Hong Kong Hong Kong Institute for Clean Energy, City University of Hong Kong, 999077 Kowloon, Hong Kong;5. Department of Materials Science and Engineering, City University of Hong Kong, 999077 Kowloon, Hong Kong Hong Kong Institute for Clean Energy, City University of Hong Kong, 999077 Kowloon, Hong Kong;6. State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, 710049 Xi'an, P. R. China;7. Department of Chemistry, City University of Hong Kong, 999077 Kowloon, Hong Kong |
| Abstract: | Organic solar cells (OSCs) have advanced rapidly due to the development of new photovoltaic materials. However, the long-term stability of OSCs still poses a severe challenge for their commercial deployment. To address this issue, a dimer acceptor (dT9TBO) with flexible linker is developed for incorporation into small-molecule acceptors to form molecular alloy with enhanced intermolecular packing and suppressed molecular diffusion to stabilize active layer morphology. Consequently, the PM6 : Y6 : dT9TBO-based device displays an improved power conversion efficiency (PCE) of 18.41 % with excellent thermal stability and negligible decay after being aged at 65 °C for 1800 h. Moreover, the PM6 : Y6 : dT9TBO-based flexible OSC also exhibits excellent mechanical durability, maintaining 95 % of its initial PCE after being bended repetitively for 1500 cycles. This work provides a simple and effective way to fine-tune the molecular packing with stabilized morphology to overcome the trade-off between OSC efficiency and stability. |
| Keywords: | Dimer Acceptor Flexible Linker Mechanical Performance Solar Cells Stability |