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首页> 外文期刊>Advanced Functional Materials >Compositional and Morphological Studies of Polythiophene/Polyfluorene Blends in Inverted Architecture Hybrid Solar Cells
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Compositional and Morphological Studies of Polythiophene/Polyfluorene Blends in Inverted Architecture Hybrid Solar Cells

机译：倒置结构混合太阳能电池中聚噻吩/聚芴共混物的组成和形态研究

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摘要

This work investigates the composition and morphology of films of poly (3-hexylthiophene) (P3HT), polyfluorene co-polymer poly((9,9-dioctylfluorene)-2,7-diyl-alt-[4,7-bis(3-hexylthien-5-yl)-2,1,3-benzothiadiazole]-2',2"-diyl) (F8TBT) and blends thereof that are used in efficient all-polymer solar cells. Ultraviolet photoemission spectroscopy (UPS) and X-ray photoemission spectroscopy (XPS) studies on thin polymer and blend films on ZnO substrates reveal the existence of a 1-2 nm thick P3HT layer at the top surface of the blend films. XPS depth profiling studies reveal a density wave (λ = 70 nm) originating from the air interface. As no preferential accumulation is observed at the bottom interface with ZnO, the composition at this interface is consistent with the original composition of the blend solution prior to spin-coating. The morphology of this buried interface was studied by means of atomic force microscopy (AFM) and revealed that upon annealing the average domain size increases slightly (from 27 nm to 40 nm). It is observed that the photovoltaic performance of such inverted hybrid device improves upon annealing, however we believe this to mostly be a result of increased crystallinity in the P3HT domains leading to improved charge transport in the device, rather than changes in the blend phase separation.
机译：这项工作调查的聚（3-己基噻吩）（P3HT），聚芴共聚物聚（（9,9-二辛基芴）-2,7-二基-alt- [4,7-bis（3） -己基噻吩-5-基）-2,1,3-苯并噻二唑] -2'，2“-二基）（F8TBT）及其混合物，用于高效的全聚合物太阳能电池。紫外光发射光谱（UPS）和X ZnO衬底上的薄聚合物和共混物薄膜的X射线光电子能谱（XPS）研究表明，共混物薄膜的顶部表面存在1-2 nm厚的P3HT层。XPS深度剖析研究显示了密度波（λ= 70 ZnO的底部界面处未观察到优先积累，因此该界面处的成分与旋涂之前混合溶液的原始成分相符，研究了该埋藏界面的形态通过原子力显微镜（AFM）观察到，退火后平均畴尺寸增加略微（从27 nm到40 nm）。可以观察到，这种反向混合装置的光伏性能在退火后会改善，但是我们认为这主要是由于P3HT域中结晶度的增加导致了装置中电荷传输的改善，而不是共混相分离的变化。

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  • 来源
    《Advanced Functional Materials》 |2012年第11期|p.2418-2424|共7页
  • 作者

    Yana Vaynzof; Thomas J. K. Brenner; Dinesh Kabra; Henning Sirringhaus; Richard H. Friend;

  • 作者单位

    Cavendish Laboratory University of Cambridge JJ Thomson Ave., Cambridge, CB3 OHE, UK;

    Cavendish Laboratory University of Cambridge JJ Thomson Ave., Cambridge, CB3 OHE, UK;

    Cavendish Laboratory University of Cambridge JJ Thomson Ave., Cambridge, CB3 OHE, UK;

    Cavendish Laboratory University of Cambridge JJ Thomson Ave., Cambridge, CB3 OHE, UK;

    Cavendish Laboratory University of Cambridge JJ Thomson Ave., Cambridge, CB3 OHE, UK,Max Planck Institute for the Science of Light, Guenther-Scharowsky-Strasse 1, 90762 Erlangen, Germany;

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