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Controlling the concentration gradient in sequentially deposited bilayer organic solar cellsviarubbing and annealing

机译：控制依次沉积的双层有机太阳能电池级和退火的浓度梯度

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摘要

We elucidate the formation mechanism of adequate vertical concentration gradients in sequentially deposited poly(3-hexylthiophene-2,5-diyl) (P3HT) and phenyl-C-61-butyric acid methyl ester (PCBM) bilayer solar cells. Using advanced analytical techniques, we clarify the origins of the enhanced photovoltaic performances of as-deposited and annealed bilayer P3HT/PCBM organic solar cells upon P3HT layer rubbing prior to PCBM deposition. Energy-dispersive X-ray spectroscopy reveals the individual effects of rubbing and annealing on the formation of adequate concentration gradients in the photoactive layers. Repetitive rubbing of P3HT strongly affects the active layer nanomorphology, forming an intermixed layer in the as-deposited devices which is retained after the annealing process. Infrared p-polarized multiple-angle incidence resolution spectrometry measurements indicate that rubbing induces a minor reorganization of the P3HT molecules in the polymer-only thin films towards face-on orientation. However, the deposition of the upper PCBM layer reverts the P3HT molecules back to their original orientation. These findings suggest that the formation of an adequate concentration gradient upon rubbing corresponds to the dominant contribution to the improved photovoltaic characteristics of rubbed bilayer organic solar cells. Using the reference low bandgap copolymer PCDTBT, we demonstrate that rubbing can be successfully applied to increase the photovoltaic performances of PCDTBT/PCBM organic solar cells. We also demonstrate that rubbing can be an efficient and versatile strategy to improve the power conversion efficiency of non-fullerene solar cells by using the reference materials in the field, PBDB-T and ITIC.
机译：我们阐明依次沉积的聚（3-己烯-2,5-二基）（P3HT）和苯基-C-61-丁酸甲酯（PCBM）双层太阳能电池的适当垂直浓度梯度的形成机制。采用先进的分析技术，我们在P3HT层沉积之前阐明了在P3HT层摩擦时增强了沉积和退火的双层P3HT / PCBM有机太阳能电池的增强光伏性能的起源。能量分散X射线光谱揭示摩擦和退火对光活性层中足够浓度梯度的形成的个体效果。 P3HT的重复摩擦强烈地影响了活性层纳米形态，在退火过程之后保持的沉积装置中形成混合层。红外P偏振多角入射率分辨率光谱测量表明，摩擦在聚合物 - 仅薄膜中朝向面对定向的轻微重组诱导P3HT分子。然而，上PCBM层的沉积将P3HT分子恢复回其原始方向。这些发现表明，在摩擦时形成足够的浓度梯度对应于对摩擦双层有机太阳能电池的改善光伏特性的显性贡献。使用参考低带隙共聚物PCDTBT，我们证明摩擦可以成功应用于增加PCDTBT / PCBM有机太阳能电池的光伏性能。我们还表明，摩擦可以是通过使用现场中的参考资料，PBDB-T和Itic中的参考资料来提高非富勒烯太阳能电池的功率转换效率的有效和多功能的策略。

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  • 来源
    《RSC Advances》 |2020年第61期|共9页
  • 作者

    Abdul Aziz Mohd Zaidan; Higashimine Koichi; Shioya Nobutaka; Shimoaka Takafumi; Hasegawa Takeshi; Sakai Heisuke; Vohra Varun; Murata Hideyuki;

  • 作者单位

    Japan Adv Inst Sci &

    Technol Sch Mat Sci Nomi Ishikawa 9231292 Japan;

    Japan Adv Inst Sci &

    Technol Ctr Nano Mat &

    Technol Nomi Ishikawa 9231292 Japan;

    Kyoto Univ Inst Chem Res Div Environm Chem Lab Chem Functionalized Surfaces Uji Kyoto 6110011 Japan;

    Kyoto Univ Inst Chem Res Div Environm Chem Lab Chem Functionalized Surfaces Uji Kyoto 6110011 Japan;

    Kyoto Univ Inst Chem Res Div Environm Chem Lab Chem Functionalized Surfaces Uji Kyoto 6110011 Japan;

    Japan Adv Inst Sci &

    Technol Sch Mat Sci Nomi Ishikawa 9231292 Japan;

    Univ Electrocommun Dept Engn Sci Chofu Tokyo 1828585 Japan;

    Japan Adv Inst Sci &

    Technol Sch Mat Sci Nomi Ishikawa 9231292 Japan;

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  • 正文语种 eng
  • 中图分类 化学;
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