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首页> 外文期刊>Macromolecules >Phenanthrodithiophene (PDT)–Difluorobenzothiadiazole (DFBT) Copolymers: Effect on Molecular Orientation and Solar Cell Performance of Alkyl Substitution onto a PDT Core
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Phenanthrodithiophene (PDT)–Difluorobenzothiadiazole (DFBT) Copolymers: Effect on Molecular Orientation and Solar Cell Performance of Alkyl Substitution onto a PDT Core

机译：菲丙基噻吩（PDT） - 氟苯甲酸噻唑（DFBT）共聚物：对PDT核心烷基取代的分子取向和太阳能电池性能的影响

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Synthesis, characterization, and solar cell application of three 4,7-dialkylated phenanthro[1,2- b :8,7- b ′]dithiophene (PDT)–difluorobenzothiadiazole (DFBT copolymers ( P1 – P3 ) with different linear alkyl side chains to improve solubility, molecular weight, and molecular orientation are described. The utilization of Ir-catalyzed direct borylation and sequential functionalization can selectively afford the target 4,7-dialkylated PDT as the monomers. Migita–Kosugi–Stille coupling in the presence of CuI can accelerate polymerization to afford high-molecular-weight polymers along with their improved solubility. The effect of alkyl substitution at the 4,7-positions on the electronic structure of PDT–DFBT copolymers is negligible. By installation of additional alkyl chains at the 4,7-positions of PDT, the synthesized polymers P1 – P3 have lower intermolecular interaction than that of nonalkylated P0 , but they still maintained aggregation behavior in solution. In addition, they formed a favorable face-on orientation with a short π-stacking distance of 3.6 ?, which can enhance their carrier transport ability, resulting in high J _(sc) and FF. As a result, their fabricated solar cells reached a PCE exceeding 6%, which are about 1.7-fold higher than that of P0 . Comparison of alkyl side chain length at the 4,7-positions of PDT revealed that all polymers formed a predominantly face-on orientation and have a similar face-on ratio in blended films, but their crystallinity was decreased as the carbon chains at the 4,7-positions of PDT became shorter. On the other hand, the polymers with short alkyl side chains tended to have low surface roughness and small domain size of active layers, which is an ideal phase separation structure for high-performance PSCs. From these results, it could be seen that the polymers have a trade-off relationship between their domain size and crystallinity, but the impact of alkyl side chain length on their photovoltaic properties is rather
机译：三种4,7-二烷基化菲的合成，表征和太阳能电池施用[1,2-B：8,7-B']二噻吩（PDT） - 大氟苯噻唑（DFBT共聚物（P1 - P3），具有不同的线性烷基侧链描述了溶解度，分子量和分子取向。IR催化的直接促进和序贯官能化的利用可以选择性地提供靶4,7-二烷基化的PDT作为单体。Migita-Kosugi-stille偶联在崔可以加速聚合以提供高分子量聚合物，以及它们的提高溶解度。烷基取代在PDT-DFBT共聚物的电子结构上的4,7位的作用可忽略不计。通过在4时安装额外的烷基链，PDT的7位，合成聚合物P1-P3具有比非烷基化的P0的分子间相互作用较低，但它们仍然保持溶液中的聚集行为。此外，它们形成了一个良好的面向面向方向，短π堆叠距离为3.6？，可以提高其运输能力，导致高J _（SC）和FF。结果，它们的制造太阳能电池达到超过6％的PCE，比P0高约1.7倍。烷基侧链长度在PDT的4,7-位的比较显示，所有聚合物都是主要面对面的取向，并在混合膜中具有相似的面对比例，但它们的结晶度随着4的碳链减少，7个PDT的PDT变短。另一方面，具有短烷基侧链的聚合物倾向于具有低表面粗糙度和有源层的小结构层，这是高性能PSC的理想相分离结构。从这些结果可以看出，聚合物在其结构域尺寸和结晶度之间具有折衷关系，但是烷基侧链长度对其光伏性能的影响是相当的

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  • 来源
    《Macromolecules》 |2018年第4期|共13页
  • 作者

    Hiroki Mori; Ryosuke Takahashi; Keita Hyodo; Shuhei Nishinaga; Yuta Sawanaka; Yasushi Nishihara;

  • 作者单位

    Research Institute for Interdisciplinary Science and Division of Earth Life and Molecular Sciences Graduate School of Natural Science and Technology Okayama University 3-1-1 Tsushimanaka Kita-ku Okayama 700-8530 Japan;

    Research Institute for Interdisciplinary Science and Division of Earth Life and Molecular Sciences Graduate School of Natural Science and Technology Okayama University 3-1-1 Tsushimanaka Kita-ku Okayama 700-8530 Japan;

    Research Institute for Interdisciplinary Science and Division of Earth Life and Molecular Sciences Graduate School of Natural Science and Technology Okayama University 3-1-1 Tsushimanaka Kita-ku Okayama 700-8530 Japan;

    Research Institute for Interdisciplinary Science and Division of Earth Life and Molecular Sciences Graduate School of Natural Science and Technology Okayama University 3-1-1 Tsushimanaka Kita-ku Okayama 700-8530 Japan;

    Research Institute for Interdisciplinary Science and Division of Earth Life and Molecular Sciences Graduate School of Natural Science and Technology Okayama University 3-1-1 Tsushimanaka Kita-ku Okayama 700-8530 Japan;

    Research Institute for Interdisciplinary Science and Division of Earth Life and Molecular Sciences Graduate School of Natural Science and Technology Okayama University 3-1-1 Tsushimanaka Kita-ku Okayama 700-8530 Japan;

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  • 正文语种 eng
  • 中图分类 高分子化学（高聚物）;
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