Hybrid-Size Quantum Dots in Hole Transport Layer Depress Dark Current Density of Short-Wave Infrared Photodetectors

被引:1
|
作者
Chen, Simin [1 ,2 ,3 ,4 ]
Zhong, Huaying [1 ,2 ,5 ]
Wang, Xiao [1 ,2 ,4 ]
Pan, Guangjiu [5 ]
Tang, Haodong [3 ]
Fang, Fan [1 ,2 ]
Wu, Jiufeng [1 ,2 ]
Wang, Weichao [4 ]
Xu, Lihai [4 ]
Tang, Jun [6 ]
Hao, Junjie [3 ]
Zheng, Keyu [4 ]
Wu, Dan [6 ]
Tang, Zeguo [6 ]
Zhang, Lei [4 ]
Cao, Leifeng [1 ,2 ]
Mueller-Buschbaum, Peter [5 ]
Wang, Kai [7 ]
Chen, Wei [1 ,2 ]
机构
[1] Shenzhen Technol Univ, Ctr Intense Laser Applicat Technol, Shenzhen Key Lab Ultraintense Laser & Adv Mat Tech, Shenzhen 518118, Peoples R China
[2] Shenzhen Technol Univ, Coll Engn Phys, Shenzhen 518118, Peoples R China
[3] Shenzhen Technol Univ, Coll Integrated Circuits & Optoelect Chips, Shenzhen 518118, Peoples R China
[4] Hubei Univ, Sch Mat Sci & Engn, Wuhan 430062, Peoples R China
[5] Tech Univ Munich, TUM Sch Nat Sci, Chair Funct Mat, Dept Phys, D-85748 Garching, Germany
[6] Shenzhen Technol Univ, Coll New Mat & New Energies, Shenzhen 518118, Peoples R China
[7] Southern Univ Sci & Technol, Inst Nanosci & Applicat, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
来源
ACS PHOTONICS | 2025年 / 12卷 / 02期
基金
中国国家自然科学基金;
关键词
quantum dots; hybrid-size; hole transport layer; GISAXS; EFFICIENCY; DISORDER;
D O I
10.1021/acsphotonics.4c01864
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
PbS quantum dots (QDs) are promising materials for low-cost short-wave infrared (SWIR) photodetection and imaging applications, owing to their unique optical properties and tunable bandgap. High-performance photodiodes rely on thiol-treated small PbS QDs as the hole transport layer (HTL) due to their suitable band alignment, but they face challenges such as crack formation, which increases dark currents. We develop a crack-free HTL by mixing small-size and large-size QDs. Grazing incidence small-angle X-ray scattering data confirms that the hybrid-size QD HTL is more homogeneous and denser than that made from monosize QDs. Photophysical studies show optimized charge carrier dynamics and energy transfer in the hybrid-size QDs, compared to monosize QDs. The devices based on the hybrid-size QD HTL exhibit a significantly reduced dark current density (392 nA/cm2). Additionally, they show high device performance, including a responsivity of 0.65 A/W, detectivity of 2.4 x 1012 Jones, and an external quantum efficiency of 65% in the SWIR region, paving the way for high-performance QD-based SWIR photodetectors.
引用
收藏
页码:879 / 888
页数:10
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