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

作　　者：Jiao Jiao Liu Xinxin Yang Qiulei Xu Ruiguang Chang Zhenghui Wu Huaibin Shen 

机构地区：[1]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

出　　处：《Opto-Electronic Science》2024年第4期1-11,共11页光电科学（英文）

基　　金：supported by the following research fundings including:the National Natural Science Foundation of China(Nos.62005114,62204078 and U22A2072);Natural Science Foundation of Henan-Excellent Youth Scholar(No.232300421092);Open Fund of the State Key Laboratory of Integrated Optoelectronics+(IOSKL2020KF01).

摘　　要：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.

关 键 词：infrared colloidal quantum dots up-conversion photodetector integration loss INTERCONNECTION voltage allocation 

分 类 号：TN215[电子电信—物理电子学] TN312.8