An Electron Acceptor with Broad Visible–NIR Absorption and Unique Solid State Packing for As‐Cast High Performance Binary Organic Solar Cells |
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| Authors: | Xueliang Shi Xunfan Liao Ke Gao Lijian Zuo Jingde Chen Jingbo Zhao Feng Liu Yiwang Chen Alex K‐Y Jen |
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| Affiliation: | 1. Department of Materials Science and Engineering, University of Washington, Seattle, WA, USA;2. Institute of Polymers, College of Chemistry, Nanchang University, Nanchang, China;3. Department of Physics and Astronomy, Shanghai Jiaotong University, Shanghai, China;4. Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong;5. Department of Materials Science & Engineering, City University of Hong Kong, Kowloon, Hong Kong |
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| Abstract: | A novel acceptor–donor–acceptor (A–D–A) type electron acceptor 6TIC‐4F with terthieno3,2‐b]thiophene (6T) as the core unit is rationally designed and synthesized, which exhibits an extraordinarily narrow bandgap (≈1.24 eV) and strong absorption between 650 and 1000 nm. X‐ray crystallographic analysis reveals that it has unique intermolecular π–π stacking. The solar cells based on the as‐cast poly(2,6‐(4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)‐benzo1,2‐b:4,5‐b′]dithiophene))‐alt‐(5,5‐(1′,3′‐di‐2‐thienyl‐5′,7′‐bis(2‐ethylhexyl)benzo1′,2′‐c:4′,5′‐c′]dithiophene‐4,8‐dione))]) (PBDB‐T): 6TIC‐4F binary blends exhibit an excellent power conversion efficiency (PCE) of 11.14% with a high JSC of 23.00 mA cm?2, and a high fill factor of 0.67, which represents one of the best PCE values for low bandgap (Eg < 1.3 eV)–based organic solar cells. |
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| Keywords: | near‐infrared semiconductors nonfullerene acceptors organic solar cells X‐ray diffraction |
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