An A-D-D-A-type small-molecule electron acceptor with chlorine substitution for high-efficiency polymer solar cells |
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| Affiliation: | 1. Key Laboratory of Theoretical Organic Chemistry and Functional Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, PR China;2. College of Chemistry, Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education, Xiangtan University, Xiangtan, 411105, PR China;3. School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou, 213164, PR China;1. School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications, Changzhou University, Changzhou 213164, PR China;2. College of Chemistry, Xiangtan University, Xiangtan 411105, PR China;1. School of Material and Chemistry Engineering, Xuzhou University of Technology, Xuzhou, 221018, China;2. Key Laboratory for Organic Electronics and Information Displays, Institute of Adv Mater (IAM), Nanjing University of Posts & Telecommunications, Nanjing, 210023, China;1. Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;2. Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers, Hunan University of Science and Technology, Xiangtan 411201, China;1. Jiangsu Province Hi-Tech Key Laboratory for Bio-Medical Research, Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, School of Chemistry and Chemical Engineering, Southeast University, Nanjing, Jiangsu, 211189, China;2. School of Environmental and Chemical Engineering, Jiangsu Key Laboratory of Function Control Technology for Advanced Materials, Jiangsu Ocean University, Lianyungang, Jiangsu, 222005, China |
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| Abstract: | Chlorination is a very effective technique to adjust molecular energy levels, absorption spectra and intermolecular π–π stacking of small-molecule acceptors (SMAs). On this basis, a new acceptor-donor-donor-acceptor (A-D-D-A)-type SMA IDT2-IC-4Cl with chlorinated end units was developed. Compared with the unchlorinated counterpart (IDT2-IC), the IDT2-IC-4Cl exhibited an efficient absorption ability in the range of 550–900 nm region. Moreover, the blend films of PBDB-T:IDT2-IC-4Cl exhibited better charge generation properties and more balanced charge mobilities as compared to those of PBDB-T:IDT2-IC blend films. Polymer solar cells (PSCs) based on PBDB-T:IDT2-IC-4Cl exhibited a power conversion efficiency (PCE) of 12.53% with a short-circuit current (Jsc) of 22.22 mA cm−2 and a fill factor (FF) of 69.81, while the PBDB-T:IDT2-IC device yielded a PCE of 8.18% with a Jsc of 13.23 mA cm−2 and a FF of 65.71. The results show that chlorination is an effective way to obtain high-performance SMAs. |
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| Keywords: | Polymer solar cells Chlorination Small-molecule acceptor Photovoltaic properties |
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