Hot Paper - Unraveling the efficiency losses and improving methods in quantum dot-based infrared up-conversion photodetectors

Unraveling the efficiency losses and improving methods in quantum dot-based infrared up-conversion photodetectors

量子点红外上转换光电探测器效率损失的揭示及改进方法
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Jiao Jiao Liu 刘交交, Xinxin Yang 杨鑫鑫, Qiulei Xu 徐秋蕾, Ruiguang Chang 苌瑞广, Zhenghui Wu 吴政辉, Huaibin Shen 申怀彬

Key Laboratory for Special Functional Materials of Ministry of Education, National & Local Joint Engineering Research Centre for High-efficiency Display and Lighting Technology, School of Materials, Henan University, Kaifeng 475004, China
中国开封河南大学材料学院特种功能材料教育部重点实验室高效显示与照明技术国家地方联合工程研究中心

https://doi.org/10.29026/oes.2024.230029

https://www.oejournal.org/article/doi/10.29026/oes.2024.230029

Opto-Electronic Science, 24 April 2024

Abstract

Quantum dot-based up-conversion photodetector, in which an infrared photodiode (PD) and a quantum dot light-emitting diode (QLED) are back-to-back connected, is a promising candidate for low-cost infrared imaging. However, the huge efficiency losses caused by integrating the PD and QLED together hasn’t been studied sufficiently. This work revealed at least three origins for the efficiency losses.

First, the PD unit and QLED unit usually didn’t work under optimal conditions at the same time. Second, the potential barriers and traps at the interconnection between PD and QLED units induced unfavorable carrier recombination. Third, much emitted visible light was lost due to the strong visible absorption in the PD unit.

Based on the understandings on the loss mechanisms, the infrared up-conversion photodetectors were optimized and achieved a breakthrough photon-to-photon conversion efficiency of 6.9%. This study provided valuable guidance on how to optimize the way of integration for up-conversion photodetectors.

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