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首页> 外文期刊>Advanced Functional Materials >Correlating Structure with Function in Thermally Annealed PCDTBT:PC_(70)BM Photovoltaic Blends
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Correlating Structure with Function in Thermally Annealed PCDTBT:PC_(70)BM Photovoltaic Blends

机译：热退火PCDTBT：PC_（70）BM光伏混合物中具有功能的相关结构

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摘要

A range of optical probes are used to study the nanoscale-structure and electronic-functionality of a photovoltaic-applicable blend of the carbazole co-polymer poly[N-9'-heptadecanyl-2,7-carbazole-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole) (PCDTBT) and the electronic accepting fullerene derivative (6,6)-phenyl C_(70)-butyric acid methyl ester (PC_(70)BM). In particular,it is shown that the glass transition temperature of a PCDTBT:PC_(70)BM blend thin-film is not sensitive to the relative blend-ratio or film thickness (at 1:4 blending ratio), but is sensitive to casting solvent and the type of substrate on which it is deposited. It is found that the glass transition temperature of the blend reduces on annealing; an observation consistent with disruption of π-π stacking between PCDTBT molecules. Reduced π-π stacking is correlated with reduced hole-mobility in thermally annealed films. It is suggested that this explains the failure of such annealing protocols to substantially improve device-efficiency. The annealing studies demonstrate that the blend only under goes coarse phase-separation when annealed at or above 155 ℃, suggesting a promising degree of morphological stability of PCDTBT:PC_(70)BM blends.
机译：一系列光学探针用于研究咔唑共聚物聚[N-9'-十七碳烯基-2,7-咔唑-alt-5,5-的光伏适用混合物的纳米级结构和电子功能（4'，7'-二-2-噻吩基-2'，1'，3'-苯并噻二唑）（PCDTBT）和电子接受富勒烯衍生物（6,6）-苯基C_（70）-丁酸甲酯（ PC_（70）BM）。尤其表明，PCDTBT：PC_（70）BM混合薄膜的玻璃化转变温度对相对混合比或膜厚度（在1：4混合比下）不敏感，但对流延敏感。溶剂及其沉积的基材类型。结果发现，共混物的玻璃化转变温度在退火时降低。与PCDTBT分子之间的π-π堆积破坏一致的观察结果。减少的π-π堆积与减少的热退火膜中的空穴迁移率有关。建议这解释了这种退火方案不能充分提高器件效率的原因。退火研究表明，共混物仅在155℃或更高的温度下退火时才发生粗相分离，这表明PCDTBT：PC_（70）BM共混物的形态稳定性达到了有希望的程度。

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  • 来源
    《Advanced Functional Materials》 |2012年第7期|p.1399-1408|共10页
  • 作者

    Tao Wang; Andrew J. Pearson; Alan D. F. Dunbar; Paul A. Staniec; Darren C. Watters; Hunan Yi; Anthony J. Ryan; Richard A. L Jones; Ahmed Iraqi; David G. Lidzey;

  • 作者单位

    Department of Physics and Astronomy University of Sheffield Sheffield, S3 7RH, UK;

    Department of Physics and Astronomy University of Sheffield Sheffield, S3 7RH, UK;

    Department of Chemical and Biological Engineering The University of Sheffield Sir Robert Hadfield Building Mappin St, Sheffield SI 3JD, UK;

    Diamond Light Source Ltd, Diamond House Harwell Science and Innovation Campus Didcot, Oxfordshire OX11 ODE, UK;

    Department of Physics and Astronomy University of Sheffield Sheffield, S3 7RH, UK;

    Department of Chemistry University of Sheffield Sheffield, S3 7RH, UK;

    Department of Chemistry University of Sheffield Sheffield, S3 7RH, UK;

    Department of Physics and Astronomy University of Sheffield Sheffield, S3 7RH, UK;

    Department of Chemistry University of Sheffield Sheffield, S3 7RH, UK;

    Department of Physics and Astronomy University of Sheffield Sheffield, S3 7RH, UK;

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