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投稿时间：2018-07-22 修订日期：2018-10-08
投稿时间：2018-07-22 修订日期：2018-10-08
中文摘要: 设计并通过Stille缩合聚合方法合成了一种基于四氟苯和4,8-双(5-(2-乙基己基)噻吩-2-基)-苯并[1,2-b:4,5-b']二噻吩单元的推拉电子型宽带隙聚合物(PBDT4F)作为聚合物太阳能电池的给体材料。用核磁共振氢谱(1H-NMR)、凝胶渗透色谱(GPC)、热重分析、紫外－可见吸收光谱和循环伏安法等对其进行了表征。结果表明：PBDT4F对400～600 nm短波长光具有强的吸收能力，并且具有低的最高占有轨道能级(HOMO)和适合的最低未占有轨道能级(LUMO)。基于PBDT4F为给体、O-IDTBR为受体的共混活性层的光伏器件取得了0.986 V的开路电压和2.58%的能量转化效率。
Abstract:In this study, a novel tetrafluorobenzene and 4,8-di(2-(2-ethylhexyl)thiophene-5-yl)-benzo[1,2-b:4,5-b’]dithiophene based push-pull π-conjugated polymer, PBDT4F, was designed and synthesized via Stille coupling polymerization method, and applied for electron donor polymer in polymer solar cells (PSCs). It was characterized via a set of methods including 1H-NMR, gel permeation chromatography (GPC), thermogravimetric (TG) analysis, UV-Vis absorption and cyclic voltammetry (CV), etc. Tetrafluorobenzene unit is endowed with electron-deficient properties and it possesses the important feature of intramolecular F…S conformational locks, which is favorable for polymer packing. Tetrafluorobenzene and its derivatives are also very readily available, commercial intermediates, which will facilitate reducing the synthetic cost of materials. The resulting polymer PBDT4F showed good solubility in common organic solvents, such as toluene, chloroform, chlorobenzene, which was favorable for solution processed organic photovoltaic devices. The number average molecular weight (Mn) and polydispersity index (PDI) of PBDT4F were measured to be 2.36 kDa and 1.84, respectively，by gel permeation chromatography with chloroform as eluent against polystyrene standards. PBDT4F exhibited a strong absorption in the short wavelength of 400~600 nm, with a wide band gap of about 2.08 eV, which was complementary with that of small molecular electron acceptor O-IDTBR. PBDT4F also showed a typical low-lying highest occupied molecular orbital (HOMO) energy level of about ?5.60 eV and a lowest unoccupied molecular orbital (LUMO) energy level of about ?3.06 eV. The low-lying HOMO energy level is very beneficial to obtain high open-circuit voltage (Voc) in PSCs. The photovoltaic devices were fabricated based on the composite films of PBDT4F electron donor and O-IDTBR electron acceptor, and displayed a modest power conversion efficiency (PCE) of 2.58% with a high Voc of 0.986 V. The new polymer PBDT4F is a promising wide band gap polymer electron donor for the photovoltaic application in PSCs.
keywords: wide band gap polymer donor photovoltaic material conjugated polymer polymer solar cells tetrafluorobenzene
文章编号：20180722001 中图分类号：O633.5 文献标志码：
基金项目:福建省中青年教师教育科研项目(JAT170094),福州大学贵重仪器设备开放测试基金(2017T003)
| 作者 | 单位 | 地址 |
| 邓平* | 福州大学材料科学与工程学院 | 福州市福州地区大学城学园路2号福州大学国家大学科技园南908室 |
| 梁玉明 | 福州大学材料科学与工程学院 | |
| 陈善慈 | 中国科学院福建物质结构研究所 |
| Author Name | Affiliation | Address |
| 邓平 | College of Materials Science and Engineering, Fuzhou University | 福州市福州地区大学城学园路2号福州大学国家大学科技园南908室 |
| LIANG Yu-ming | College of Materials Science and Engineering, Fuzhou University | |
| Chen Shan-ci | State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences |
引用本文：
邓平,梁玉明,陈善慈.四氟苯基宽带隙聚合物给体光伏材料的研究[J].功能高分子学报,DOI:10.14133/j.cnki.1008-9357.20180722001.
邓平,LIANG Yu-ming,Chen Shan-ci.Study of Tetrafluorobenzene Based Wide Band Gap Polymer Donor Photovoltaic Material[J].Journal of Functional Polymers,DOI:10.14133/j.cnki.1008-9357.20180722001.
邓平,梁玉明,陈善慈.四氟苯基宽带隙聚合物给体光伏材料的研究[J].功能高分子学报,DOI:10.14133/j.cnki.1008-9357.20180722001.
邓平,LIANG Yu-ming,Chen Shan-ci.Study of Tetrafluorobenzene Based Wide Band Gap Polymer Donor Photovoltaic Material[J].Journal of Functional Polymers,DOI:10.14133/j.cnki.1008-9357.20180722001.
