| Title | Backbone Configuration and Electronic Property Tuning of Imide-Functionalized Ladder-Type Heteroarenes-Based Polymer Acceptors for Efficient All-Polymer Solar Cells |
| Authors | Liu, Bin Wang, Yingfeng Sun, Huiliang Gamez-Valenzuela, Sergio Yan, Zhenglong Feng, Kui Uddin, Mohammad Afsar Koh, Changwoo Zhou, Xin Lopez Navarrete, Juan Teodomiro Ruiz Delgado, Maria Carmen Meng, Hong Niu, Li Woo, Han Young Ponce Ortiz, Rocio Guo, Xugang |
| Affiliation | Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China Peking Univ, Shenzhen Grad Sch, Sch Adv Mat, Shenzhen 518055, Guangdong, Peoples R China Guangzhou Univ, Ctr Adv Analyt Sci, Sch Chem & Chem Engn, Guangzhou 510006, Guangdong, Peoples R China Univ Malaga, Dept Phys Chem, Campus Teatinos S-N, Malaga 29071, Spain Korea Univ, Coll Sci, Dept Chem, Seoul 136713, South Korea Songshan Lake Mat Lab, Dongguan 523808, Guangdong, Peoples R China |
| Keywords | POWER CONVERSION EFFICIENCY MOLECULAR-ORBITAL METHODS HIGH-PERFORMANCE CONJUGATED POLYMERS ADDITIVE-FREE CHARGE SEPARATION DIPOLE-MOMENT A COPOLYMERS ORDER MORPHOLOGY |
| Issue Date | Feb-2022 |
| Publisher | ADVANCED FUNCTIONAL MATERIALS |
| Abstract | Electron-deficient ladder-type pi-conjugated systems are highly desired for constructing polymer acceptors due to their unique electronic properties. Herein, two series of polymer acceptors PBTIn-(F)T (n = 1-4) based on imide-functionalized ladder-type heteroarenes (BTIn) with tunable conjugation length are synthesized. Effects of their backbone configuration and electronic properties on film morphology and performance of all-polymer solar cells (all-PSCs) are systematically investigated through theoretical computation, Raman spectroscopy, grazing incidence wide-angle X-ray scattering, etc. It is found that the ladder-type heteroarene size extension and polymer backbone fluorination gradually lower the frontier molecular orbital energy levels, leading to progressive bandgap narrowing with more efficient exciton dissociation. Furthermore, the centrosymmetric and axisymmetric characteristics of BTIn result in distinct backbone configuration with varied self-aggregation and crystalline phases, hence determining the blend film morphology. The highest efficiencies in these two series are attained from PBTI3-T and PBTI3-FT with a curved backbone configuration. PBTI4-(F)T with further extended heteroarenes shows linear backbone, negatively affecting film morphology and efficiency. This study provides fundamental material structure-device performance correlations for ladder-type heteroarenes-based polymer acceptors for the first time and demonstrates that more extended ladder-type backbones do not necessarily improve the device performance, offering guidelines for designing polymer acceptors to maximize all-PSC performance. |
| URI | http://hdl.handle.net/20.500.11897/638254 |
| ISSN | 1616-301X |
| DOI | 10.1002/adfm.202200065 |
| Indexed | SCI(E) |
| Appears in Collections: | 深圳研究生院待认领 |
