High‐Performance As‐Cast Nonfullerene Polymer Solar Cells with Thicker Active Layer and Large Area Exceeding 11% Power Conversion Efficiency |
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| Authors: | Qunping Fan Yan Wang Maojie Zhang Bo Wu Xia Guo Yufeng Jiang Wanbin Li Bing Guo Chennan Ye Wenyan Su Jin Fang Xuemei Ou Feng Liu Zhixiang Wei Tze Chien Sum Thomas P Russell Yongfang Li |
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| Affiliation: | 1. State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, China;2. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore;3. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA;4. Department of Physics and Astronomy, Shanghai Jiaotong University, Shanghai, China;5. CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, China;6. CAS Research/Education Center for Excellence in Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China |
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| Abstract: | In this work, a nonfullerene polymer solar cell (PSC) based on a wide bandgap polymer donor PM6 containing fluorinated thienyl benzodithiophene (BDT‐2F) unit and a narrow bandgap small molecule acceptor 2,2′‐((2Z,2′Z)‐((4,4,9,9‐tetrahexyl‐4,9‐dihydro‐s‐indaceno1,2‐b:5,6‐b′]dithiophene‐2,7‐diyl)bis(methanylylidene))bis(3‐oxo‐2,3‐dihydro‐1H‐indene‐2,1‐diylidene))dimalononitrile (IDIC) is developed. In addition to matched energy levels and complementary absorption spectrum with IDIC, PM6 possesses high crystallinity and strong π–π stacking alignment, which are favorable to charge carrier transport and hence suppress recombination in devices. As a result, the PM6:IDIC‐based PSCs without extra treatments show an outstanding power conversion efficiency (PCE) of 11.9%, which is the record value for the as‐cast PSC devices reported in the literature to date. Moreover, the device performances are insensitive to the active layer thickness (≈95–255 nm) and device area (0.20–0.81 cm2) with PCEs of over 11%. Besides, the PM6:IDIC‐based flexible PSCs with a large device area of 1.25 cm2 exhibit a high PCE of 6.54%. These results indicate that the PM6:IDIC blend is a promising candidate for future roll‐to‐roll mass manufacturing and practical application of highly efficient PSCs. |
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| Keywords: | large area nonfullerene polymer solar cells thicker active layer wide‐bandgap polymer donor without extra treatments |
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