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首页> 外文期刊>Advanced Functional Materials >The Role of Dielectric Screening in Organic Shortwave Infrared Photodiodes for Spectroscopic Image Sensing
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The Role of Dielectric Screening in Organic Shortwave Infrared Photodiodes for Spectroscopic Image Sensing

机译：介电筛选在用于光谱图像传感的有机短波红外光电二极管中的作用

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摘要

This work examines an additive approach that increases dielectric screening to overcome performance challenges in organic shortwave infrared (SWIR) photodiodes. The role of the high-permittivity additive, camphoric anhydride, in the exciton dissociation and charge collection processes is revealed through measurements of transient photoconductivity and electrochemical impedance. Dielectric screening reduces the exciton binding energy to increase exciton dissociation efficiency and lowers trap-assisted recombination loss, in the absence of any morphological changes for two polymer variants. In the best devices, the peak internal quantum efficiency at 1100 nm is increased up to 66%, and the photoresponse extends to 1400 nm. The SWIR photodiodes are integrated into a 4 x 4 pixel imager to demonstrate tissue differentiation and estimate the fat-to-muscle ratio through noninvasive spectroscopic analysis.
机译：这项工作研究了一种增加介电屏蔽以克服有机短波红外（SWIR）光电二极管性能挑战的附加方法。通过测量瞬态光电导和电化学阻抗，揭示了高介电常数添加剂樟脑酐在激子离解和电荷收集过程中的作用。介电筛选可降低激子结合能，从而增加激子解离效率并降低陷阱辅助的重组损失，而两种聚合物变体均无任何形态变化。在最佳器件中，在1100 nm处的峰值内部量子效率提高到66％，并且光响应扩展到1400 nm。 SWIR光电二极管集成到4 x 4像素成像仪中，以展示组织分化并通过无创光谱分析估计脂肪与肌肉的比率。

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  • 来源
    《Advanced Functional Materials》 |2018年第50期|1805738.1-1805738.9|共9页
  • 作者

    Wu Zhenghui; Zhai Yichen; Yao Weichuan; Eedugurala Naresh; Zhang Song; Huang Lifeng; Gu Xiaodan; Azoulay Jason D.; Ng Tse Nga;

  • 作者单位

    Univ Calif San Diego, Dept Elect & Comp Engn, 9500 Gilman Dr, La Jolla, CA 92093 USA;

    Univ Calif San Diego, Dept Elect & Comp Engn, 9500 Gilman Dr, La Jolla, CA 92093 USA;

    Univ Calif San Diego, Dept Elect & Comp Engn, 9500 Gilman Dr, La Jolla, CA 92093 USA;

    Univ Southern Mississippi, Sch Polymer Sci & Engn, 118 Coll Dr 5050, Hattiesburg, MS 39406 USA;

    Univ Southern Mississippi, Sch Polymer Sci & Engn, 118 Coll Dr 5050, Hattiesburg, MS 39406 USA;

    Univ Southern Mississippi, Sch Polymer Sci & Engn, 118 Coll Dr 5050, Hattiesburg, MS 39406 USA;

    Univ Southern Mississippi, Sch Polymer Sci & Engn, 118 Coll Dr 5050, Hattiesburg, MS 39406 USA;

    Univ Southern Mississippi, Sch Polymer Sci & Engn, 118 Coll Dr 5050, Hattiesburg, MS 39406 USA;

    Univ Calif San Diego, Dept Elect & Comp Engn, 9500 Gilman Dr, La Jolla, CA 92093 USA;

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  • 正文语种 eng
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  • 关键词

    dielectric screening; organic shortwave infrared photodiodes; spectroscopic imaging;

    机译：介电筛选;有机短波红外光电二极管;光谱成像;

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