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首页> 外文期刊>Advanced Functional Materials >Room-Temperature Phase Demixing in Bulk Heterojunction Layers of Solution-Processed Organic Photodetectors: the Effect of Active Layer Ageing on the Device Electro-optical Properties
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Room-Temperature Phase Demixing in Bulk Heterojunction Layers of Solution-Processed Organic Photodetectors: the Effect of Active Layer Ageing on the Device Electro-optical Properties

机译：溶液处理有机光电探测器的本体异质结层中的室温相混合：有源层老化对器件电光性质的影响

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摘要

Herein, we address the reduction in the external quantum efficiency (EQE) of solution-processed organic photodetectors caused by the room temperature phase demixing of components in the composite material of the photoactive layer. The reduction takes place under ambient conditions and after the completion of device fabrication. As a model system, we study photoactive blend films that consist of the electron acceptor N,N'-bis(alkyl)-3,4,9,10-perylene tetracarboxylic diimide) (PDI) and the electron donor polymer poly(9,9'-dioc-tylfluorene-co-benzothiadiazole) (F8BT). The ambient ageing of these photoactive layers is a consequence of the PDI component segregation; however, the final PDI domain size remains smaller than the resolution limit of optical microscopy. We find that the photophysical properties of the aged F8BT:PDI layer and the EQE of the aged device are significantly altered. The fabrication of F8BT:PDI layers from solvents of increasing boiling point allows for the spectroscopic monitoring of the ageing-induced phase segregation (a-PSC) process. For each solvent used, the extent of a-PSC is correlated with the PDI dispersion in the F8BT matrix as received immediately after layer deposition. The tendency for room temperature phase demixing becomes stronger as PDI is more finely dispersed in the freshly spun F8BT:PDI layer. The evolution of the room temperature phase segregation of PDI has a negative impact on the photophysical processes that are essential for charge photogeneration in the F8BT:PDI photoactive layer.
机译：在本文中，我们解决了由于光敏层复合材料中各组分在室温下相混合而引起的溶液处理有机光电探测器外部量子效率（EQE）降低的问题。减少发生在环境条件下并且在器件制造完成之后。作为模型系统，我们研究了由电子受体N，N'-双（烷基）-3,4,9,10-per四羧酸二酰亚胺（PDI）和电子给体聚合物poly（9， 9'-二辛基芴-共苯并噻二唑）（F8BT）。这些光敏层的环境老化是PDI组分偏析的结果。但是，最终的PDI域大小仍然小于光学显微镜的分辨率极限。我们发现，老化的F8BT：PDI层的光物理特性和老化设备的EQE发生了显着变化。用沸点不断增加的溶剂制造F8BT：PDI层，可以对老化引起的相分离（a-PSC）过程进行光谱监控。对于每种使用的溶剂，a-PSC的程度与层沉积后立即收到的F8BT基质中的PDI分散度相关。随着PDI更好地分散在刚纺制的F8BT：PDI层中，室温相混合的趋势变得更强。 PDI室温相分离的发展对光物理过程具有负面影响，这对于F8BT：PDI光敏层中的电荷光生化至关重要。

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  • 来源
    《Advanced Functional Materials》 |2011年第8期|p.1355-1363|共9页
  • 作者

    Panagiotis E. Keivanidis; Frederic Laquai; Ian A. Howard; Richard H. Friend;

  • 作者单位

    Optoelectronics Group University of Cambridge Cavendish Laboratory J.J. Thomson Avenue, Cambridge CB3 OHE, U.K,Centre for Nanoscience and Technology, Italian Institute of Technology, Via Pascoli 70/3, Piazza Leonardo da Vinci 32, Milan 20133, Italy;

    Optoelectronics Group University of Cambridge Cavendish Laboratory J.J. Thomson Avenue, Cambridge CB3 OHE, U.K,Max Planck Institute for Polymer Research, Max Planck Research Group for Organic Optoelectronics,Ackermannweg 10, Mainz D-55128, Germany;

    Optoelectronics Group University of Cambridge Cavendish Laboratory J.J. Thomson Avenue, Cambridge CB3 OHE, U.K;

    Optoelectronics Group University of Cambridge Cavendish Laboratory J.J. Thomson Avenue, Cambridge CB3 OHE, U.K;

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