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Indoline-Based Molecular Engineering for Optimizing the Performance of Photoactive Thin Films

机译：基于吲哚啉的分子工程可优化光敏薄膜的性能

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摘要

New indoline dyes (RK-1-4) were designed with a planar geometry and high molar extinction coefficient, which provided surprising power conversion efficiency (PCE) with a thin titanium dioxide film in dye-sensitized solar cells (DSCs). They had a difference in only alkyl chain length. Despite the same molecular structure, the performance of the respective DSCs varied significantly. Investigating the dye adsorption processes and charge transfer kinetics, the alkyl chain length was determined to affect the dye surface coverage as well as the recombination between the injected photoelectrons and the oxidized redox mediators. When applied to the DSCs as a light harvester, RK-3 with the dodecyl group exhibited the best photocurrent density, consequently achieving the best PCE of 9.1% with a 1.8 mu m active and 2.5 mu m scattering layer because of the most favorable charge injection. However, when increasing the active layer thickness, overall device performance deteriorated and the charge collection and regeneration played major roles for determining the PCE. Therefore, RK-2 featuring the highest surface coverage and moderate alkyl chain length obtained the highest PCEs of 8.8% and 7.9% with 3.5 and 5.1 mu m active layers, respectively. These results present a promising perspective of organic dye design for thin film DSCs.
机译：设计了具有平面几何形状和高摩尔消光系数的新型二氢吲哚染料（RK-1-4），通过染料敏化太阳能电池（DSC）中的二氧化钛薄膜，可提供令人惊讶的功率转换效率（PCE）。它们仅烷基链长有所不同。尽管分子结构相同，但各个DSC的性能差异很大。通过研究染料的吸附过程和电荷转移动力学，确定了烷基链的长度，以影响染料的表面覆盖率以及注入的光电子与氧化的氧化还原介体之间的重组。当作为光收集器应用于DSC时，带有十二烷基的RK-3表现出最佳的光电流密度，因此，由于最有利的电荷注入，在1.8μm的活性层和2.5μm的散射层上可达到9.1％的最佳PCE。 。但是，当增加有源层厚度时，整个器件性能会下降，电荷收集和再生在确定PCE方面起着重要作用。因此，具有最高表面覆盖率和中等烷基链长度的RK-2在3.5和5.1μm的活性层上分别获得了8.8％和7.9％的最高PCE。这些结果为薄膜DSC的有机染料设计提供了令人鼓舞的前景。

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  • 来源
    《Advanced Functional Materials》 |2016年第38期|6876-6887|共12页
  • 作者

    Jin Ming Yu; Kim Byung-Man; Jung Hyun Sil; Park Jun-Hyeok; Roh Deok-Ho; Nam Dong Guk; Kwon Tae-Hyuk; Ryu Do Hyun;

  • 作者单位

    Sungkyunkwan Univ, Dept Chem, Suwon 440746, South Korea;

    Ulsan Natl Inst Sci & Technol, Dept Chem, Ulsan 689798, South Korea|Ulsan Natl Inst Sci & Technol, Sch Mol Sci, Ulsan 689798, South Korea;

    Sungkyunkwan Univ, Dept Chem, Suwon 440746, South Korea;

    Ulsan Natl Inst Sci & Technol, Dept Chem, Ulsan 689798, South Korea;

    Ulsan Natl Inst Sci & Technol, Dept Chem, Ulsan 689798, South Korea;

    Sungkyunkwan Univ, Dept Chem, Suwon 440746, South Korea;

    Ulsan Natl Inst Sci & Technol, Dept Chem, Ulsan 689798, South Korea|Ulsan Natl Inst Sci & Technol, Sch Mol Sci, Ulsan 689798, South Korea;

    Sungkyunkwan Univ, Dept Chem, Suwon 440746, South Korea;

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