| MATERIALS FOR SOLAR CELLS |
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| Synthesis of a New Random Terpolymer Donor with an Application to Organic Solar Cells |
| REN Jingkun1, LIU Weipeng1, LI Zhanfeng1, SUN Qinjun1, WANG Hua2, SHI Fang1, HAO Yuying1
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1 Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education and Shanxi Province, College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024;
2 Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Taiyuan 030024 |
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Abstract A new random 2D/A terpolymer PDPP-BDT-NT comprising diketopyrrolo[3,4-c]pyrrole-1,4-dione (DPP) as A unit, benzo[1,2-b∶4,5-b′]dithiophene (BDT) and naphthalene (NT) as D units has been designed and synthesized via Stille coupling polymerization specifically for polymer solar cells (PSCs). Its structure was defined by proton nuclear magnetic resonance (1H NMR). And its thermogravimetric analysis, photophysical properties and energy-level structure were studied by thermal property, ultraviolet-visble (UV-Vis) absorption spectra, and cyclic voltammetry(CV). PDPP-BDT-NT exhibited good thermal stability with a decomposition temperature over 401 ℃. The terpolymer presented both broad absorption (300—900 nm) and low highest occupied molecular orbital level for -5.35 eV. Preliminary studies of bulk heterojunction (BHJ) solar cells based on PDPP-BDT-NT as donor material with PC60BM as acceptor material showed a promising power conversion efficiency (PCE) of 2.09% without any processing and post-treatment (under the illumination of AM 1.5, 100 mW·cm-2), after MeOH treatment, the PCE of polymer solar cell was raised to 2.34%.
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Published: 10 September 2017
Online: 2018-05-07
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