The Role of Dielectric Screening in Organic Shortwave Infrared Photodiodes for Spectroscopic Image Sensing,Advanced Functional Materials

当前位置： X-MOL 学术 › Adv. Funct. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

The Role of Dielectric Screening in Organic Shortwave Infrared Photodiodes for Spectroscopic Image Sensing
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-10-16 , DOI: 10.1002/adfm.201805738
Zhenghui Wu ₁ , Yichen Zhai ₁ , Weichuan Yao ₁ , Naresh Eedugurala ₂ , Song Zhang ₂ , Lifeng Huang ₂ , Xiaodan Gu ₂ , Jason D. Azoulay ₂ , Tse Nga Ng ₁

Affiliation

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 × 4 pixel imager to demonstrate tissue differentiation and estimate the fat‐to‐muscle ratio through noninvasive spectroscopic analysis.

中文翻译：

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

这项工作研究了一种可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的结合能，从而增加激子的解离效率，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。在最好的器件中，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。

更新日期：2018-10-16

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11