Side-chain effects on the solution-phase conformations and charge photogeneration dynamics of low-bandgap copolymers
文献类型：期刊论文
| 作者 | Huo, Ming-Ming1,2; Liang, Ran2; Xing, Ya-Dong2; Hu, Rong2; Zhao, Ning-Jiu2; Zhang, Wei2; Fu, Li-Min2; Ai, Xi-Cheng2; Zhang, Jian-Ping1,2; Hou, Jian-Hui3 |
| 刊名 | JOURNAL OF CHEMICAL PHYSICS
 |
| 出版日期 | 2013-09-28 |
| 卷号 | 139期号:12 |
| ISSN号 | 0021-9606 |
| DOI | 10.1063/1.4821751 |
| 英文摘要 | Solution-phase conformations and charge photogeneration dynamics of a pair of low-bandgap copolymers based on benzo[1,2-b: 4,5-b'] dithiophene (BDT) and thieno[3,4-b] thiophene (TT), differed by the respective carbonyl (-C) and ester (-E) substituents at the TT units, were comparatively investigated by using near-infrared time-resolved absorption (TA) spectroscopy at 25 degrees C and 120 degrees C. Steady-state and TA spectroscopic results corroborated by quantum chemical analyses prove that both PBDTTT-C and PBDTTT-E in chlorobenzene solutions are self-aggregated; however, the former bears a relatively higher packing order. Specifically, PBDTTT-C aggregates with more p-p stacked domains, whereas PBDTTT-E does with more random coils interacting strongly at the chain intersections. At 25 degrees C, the copolymers exhibit comparable exciton lifetimes (similar to 1 ns) and fluorescence quantum yields (similar to 2%), but distinctly different charge photogeneration dynamics: PBDTTT-C on photoexcitation gives rise to a branching ratio of charge separated (CS) over charge transfer (CT) states more than 20% higher than PBDTTT-E does, correlating with their photovoltaic performance. Temperature and excitation-wavelength dependent exciton/charge dynamics suggest that the CT states localize at the chain intersections that are survivable up to 120 degrees C, and that the excitons and the CS states inhabit the stretched strands and the also thermally robust orderly stacked domains. The stable self-aggregation structures and the associated primary charge dynamics of the PBDTTT copolymers in solutions are suggested to impact intimately on the morphologies and the charge photogeneration efficiency of the solid-state photoactive layers. (C) 2013 AIP Publishing LLC. |
| 语种 | 英语 |
| WOS记录号 | WOS:000325392000092 |
| 出版者 | AMER INST PHYSICS |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/42181]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Zhang, Jian-Ping |
| 作者单位 | 1.Harbin Inst Technol, Dept Phys, Ctr Condensed Matter Sci & Technol, Harbin 150001, Peoples R China 2.Renmin Univ China, Dept Chem, Beijing 100872, Peoples R China 3.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, State Key Lab Polymer Phys & Chem, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Huo, Ming-Ming,Liang, Ran,Xing, Ya-Dong,et al. Side-chain effects on the solution-phase conformations and charge photogeneration dynamics of low-bandgap copolymers[J]. JOURNAL OF CHEMICAL PHYSICS,2013,139(12). |
| APA | Huo, Ming-Ming.,Liang, Ran.,Xing, Ya-Dong.,Hu, Rong.,Zhao, Ning-Jiu.,...&Hou, Jian-Hui.(2013).Side-chain effects on the solution-phase conformations and charge photogeneration dynamics of low-bandgap copolymers.JOURNAL OF CHEMICAL PHYSICS,139(12). |
| MLA | Huo, Ming-Ming,et al."Side-chain effects on the solution-phase conformations and charge photogeneration dynamics of low-bandgap copolymers".JOURNAL OF CHEMICAL PHYSICS 139.12(2013). |
入库方式： OAI收割
来源：化学研究所
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