A Wide Band Gap Polymer with a Deep Highest Occupied Molecular Orbital Level Enables 14.2% Efficiency in Polymer Solar Cells
文献类型：期刊论文
| 作者 | Li, Sunsun1,5; Ye, Long2,3; Zhao, Wenchao1,5; Yan, Hongping4; Yang, Bei1,5; Liu, Delong1; Li, Wanning1,5; Ade, Harald2,3; Hou, Jianhui1,5 |
| 刊名 | JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
 |
| 出版日期 | 2018-06-13 |
| 卷号 | 140期号:23页码:7159-7167 |
| ISSN号 | 0002-7863 |
| DOI | 10.1021/jacs.8b02695 |
| 英文摘要 | To simultaneously achieve low photon energy loss (E-loss) and broad spectral response, the molecular design of the wide band gap (WBG) donor polymer with a deep HOMO level is of critical importance in fullerene-free polymer solar cells (PSCs). Herein, we developed a new benzodithiophene unit, i.e., DTBDT-EF, and conducted systematic investigations on a WBG DTBDT-EF-based donor polymer, namely, PDTB-EF-T. Due to the synergistic electron-withdrawing effect of the fluorine atom and ester group, PDTB-EFT exhibits a higher oxidation potential, i.e., a deeper HOMO level (ca. -5.5 eV) than most well-known donor polymers. Hence, a high open-circuit voltage of 0.90 V was obtained when paired with a fluorinated small molecule acceptor (IT-4F), corresponding to a low E-loss, of 0.62 eV. Furthermore, side-chain engineering demonstrated that subtle side-chain modulation of the ester greatly influences the aggregation effects and molecular packing of polymer PDTB-EF-T. With the benefits of the stronger interchain pi-pi interaction, the improved ordering structure, and thus the highest hole mobility, the most symmetric charge transport and reduced recombination are achieved for the linear decyl-substituted PDTB-EF-T (P2)-based PSCs, leading to the highest short-circuit current density and fill factor (FF). Due to the high Flory-Huggins interaction parameter (chi), surface-directed phase separation occurs in the P2:IT-4F blend, which is supported by X-ray photoemission spectroscopy results and cross-sectional transmission electron microscope images. By taking advantage of the vertical phase distribution of the P2:IT4F blend, a high power conversion efficiency (PCE) of 14.2% with an outstanding FF of 0.76 was recorded for inverted devices. These results demonstrate the great potential of the DTBDT-EF unit for future organic photovoltaic applications. |
| 语种 | 英语 |
| 出版者 | AMER CHEMICAL SOC |
| WOS记录号 | WOS:000435525500019 |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/42529]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Hou, Jianhui |
| 作者单位 | 1.Chinese Acad Sci, Inst Chem, State Key Lab Polymer Phys & Chem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China 2.North Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA 3.North Carolina State Univ, Oragn & Carbon Elect Lab ORaCEL, Raleigh, NC 27695 USA 4.SLAC Natl Accelerator Lab, Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA 94025 USA 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Sunsun,Ye, Long,Zhao, Wenchao,et al. A Wide Band Gap Polymer with a Deep Highest Occupied Molecular Orbital Level Enables 14.2% Efficiency in Polymer Solar Cells[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,2018,140(23):7159-7167. |
| APA | Li, Sunsun.,Ye, Long.,Zhao, Wenchao.,Yan, Hongping.,Yang, Bei.,...&Hou, Jianhui.(2018).A Wide Band Gap Polymer with a Deep Highest Occupied Molecular Orbital Level Enables 14.2% Efficiency in Polymer Solar Cells.JOURNAL OF THE AMERICAN CHEMICAL SOCIETY,140(23),7159-7167. |
| MLA | Li, Sunsun,et al."A Wide Band Gap Polymer with a Deep Highest Occupied Molecular Orbital Level Enables 14.2% Efficiency in Polymer Solar Cells".JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 140.23(2018):7159-7167. |
入库方式： OAI收割
来源：化学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。