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首页> 外文期刊>RSC Advances >Blend films of an amorphous conjugated polymer and a thermal precursor fullerene: effects of annealing temperatures on film structures and photovoltaic properties
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Blend films of an amorphous conjugated polymer and a thermal precursor fullerene: effects of annealing temperatures on film structures and photovoltaic properties

机译：无定形共轭聚合物的混合薄膜和热前体富勒烯：退火温度对薄膜结构和光伏性能的影响

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摘要

A thermal precursor approach can serve as a solution-based process to form high-quality organic thin-films from small molecules with low solubility such as pristine fullerenes. In this study, highly-soluble C-60-9-methylanthracene (9MA) adducts, of which the appended 9MA groups can be easily detached and evaporated by heating, were used as thermal precursors to C-60. In a composite film of C-60-9MA adducts with an amorphous polymer, poly(2,7-carbazole-alt-dithienylbenzothiadiazole) (PCDTBT) for bulk heterojunction (BHJ) solar cells, the C-60 aggregation was suppressed even after the thermal detachment of the 9MA groups at high temperature up to 160 degrees C. This result is contrasted with a composite film of the C-60-9MA adducts and a crystalline conjugated polymer, poly(3-hexylthiophene) (P3HT), yielding undesirable large aggregates by thermal annealing. The organic photovoltaic (OPV) device based on the composite film of the C-60-9MA adducts and PCDTBT showed a low power conversion efficiency (PCE) of 0.69%, which was remarkably improved up to 3.51% by a factor of ca. 5 after the thermal annealing treatment. Importantly, the maximum PCE was achieved at 140 degrees C, where an increase of the short-circuit current density (J(SC)) and a decrease of the open-circuit voltage (V-OC) are well-balanced with increasing the annealing temperature. The results obtained here demonstrate the potential utility of the unique thermal precursor approach to form high-quality BHJ films from amorphous conjugated polymers and highly-insoluble fullerenes, expecting higher LUMO levels and V-OC for applications in organic thin-film OPV devices made by cost-effective solution-based processes.
机译：热前体方法可以用作基于溶液的方法，以形成来自具有低溶解度的小分子的高质量有机薄膜，例如原始富勒烯。在该研究中，高溶的C-60-9-甲基蒽（9mA）加合物，其中所附的9mA基团可以通过加热容易地分离和蒸发，用作C-60的热前体。在C-60-9MA的复合薄膜用无定形聚合物加合物，用于散装异质结（BHJ）太阳能电池的聚（2,7-咔唑-ATT-DITHENALBENTOCHIADOZOLE）（PCDTBT），即使在其中仍抑制C-60聚集在高温下的9mA基团的热脱离可达160℃。该结果与C-60-9MA加合物的复合膜和结晶缀合聚合物，聚（3-己基烯烯）（P3HT）对比，产生不希望的大热退火聚集。基于C-60-9MA加合物和PCDTB的复合膜的有机光伏（OPV）器件显示出0.69％的低功率转换效率（PCE），其显着提高至约3.51％。 5在热退火处理后。重要的是，在140摄氏度下实现最大PCE，其中短路电流密度（J（SC））的增加和开路电压（V-OC）的减小随着退火的良好平衡温度。这里获得的结果证明了独特的热前体方法的潜在效用，以形成来自无定形共轭聚合物和高度不溶性的富勒烯的高质量的BHJ薄膜，预期较高的LUMO水平和V-OC用于有机薄膜OPV器件中的应用经济高效的基于解决方案的过程。

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  • 来源
    《RSC Advances》 |2016年第87期|共9页
  • 作者

    Umeyam Tomokazu; Shibata Sho; Imahori Hiroshi;

  • 作者单位

    Kyoto Univ Grad Sch Engn Dept Mol Engn Nishikyo Ku Kyoto 6158510 Japan;

    Kyoto Univ Grad Sch Engn Dept Mol Engn Nishikyo Ku Kyoto 6158510 Japan;

    Kyoto Univ Grad Sch Engn Dept Mol Engn Nishikyo Ku Kyoto 6158510 Japan;

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  • 正文语种 eng
  • 中图分类 化学;
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