| Title | Enhanced Photovoltaic Performance by Synergistic Effect of Chlorination and Selenophene pi-Bridge |
| Authors | Chao, Pengjie Guo, Meigen Zhu, Yulin Chen, Hui Pu, Mingrui Huang, Hsin-Hsiang Meng, Hong Yang, Chuluo He, Feng |
| Affiliation | Southern Univ Sci & Technol, Shenzhen Grubbs Inst, Shenzhen 518055, Peoples R China Southern Univ Sci & Technol, Dept Chem, Shenzhen 518055, Peoples R China Shenzhen Univ, Shenzhen Key Lab Polymer Sci & Technol, Coll Mat Sci & Engn, Shenzhen 518060, Peoples R China Peking Univ, Shenzhen Grad Sch, Sch Adv Mat, Shenzhen 518055, Peoples R China Natl Taiwan Univ, Dept Mat Sci & Engn, Ctr Condensed Matter Sci, Taipei 10617, Taiwan |
| Keywords | ENERGY LEVEL MODULATION OPEN-CIRCUIT VOLTAGE POLYMER SOLAR-CELLS SIDE-CHAIN DESIGN CONJUGATED POLYMERS V-OC THIOPHENE STRATEGY ACCEPTOR ELECTROLYTES |
| Issue Date | 28-Apr-2020 |
| Publisher | MACROMOLECULES |
| Abstract | In the rapid innovation of organic solar cells, polymer donor plays a significant role in achieving high power conversion efficiencies (PCEs). The strong intermolecular interactions and deep highest occupied molecular orbitals (HOMOs) of donor polymers will facilitate the favorable phase separation and high open-circuit voltage (V-oc), resulting in the dramatic improvement of device performance. Herein, combined chlorination of 4,8-bis(thiophene-2-yl)-benzo[1,2-b:4,5-b']-dithiophene (T-BDT) and selenophene pi-bridges, a new polymer donor, named PBBSe-Cl, is designed and synthesized. Compared to its parent polymer without chlorine substitution and pi-bridge (named PBB), PBBSe-Cl exhibits much stronger absorption, better molecular planarity, and improved molecular aggregations. Moreover, PBBSe-Cl shows favorable phase separation and bicontinuous interpenetrating network when blending with acceptor Y6. As a result, the inverted device based on PBBSe-Cl achieves a decent PCE of 14.44%, with synchronously improved short-circuit current density (J(sc)) of 24.07 mA cm(-2) and fill factor (FF) of 73.16%. However, its parent polymers PBB and PBBSe-H only present a relatively low device performance. In addition, a very low energy loss (E-loss) of 0.51 eV is realized for PBBSe-Cl-based devices. This investigation proves that introducing chlorine atoms on the conjugated side chains and selenophene it-bridges will stepwise increase the polymer solar cell efficiency due to the simultaneous enhancement of device current density and fill factor. The proper usage of chlorination and selenophene pi-bridge is a facile and efficient strategy for high-performance solar conversion materials. |
| URI | http://hdl.handle.net/20.500.11897/588601 |
| ISSN | 0024-9297 |
| DOI | 10.1021/acs.macromol.0c00405 |
| Indexed | SCI(E) Scopus |
| Appears in Collections: | 深圳研究生院待认领 |
