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6 November 2023 Improved stability of HgTe quantum dot photodetectors through a CdTe hole transport layer
Binbin Wang, Xingchen Zhang, Huicheng Hu, Zhaorong Shi, Mohan Yuan, Xinzheng Lan
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Proceedings Volume 12921, Third International Computing Imaging Conference (CITA 2023); 129214V (2023) https://doi.org/10.1117/12.2691909
Event: Third International Computing Imaging Conference (CITA 2023), 2023, Sydney, Australia
Abstract
HgTe Colloidal Quantum Dots (CQDs) have garnered wide interests in the area of cost-effective infrared imaging technology. In this study, we developed a low-temperature drop-by-drop method to synthesize branched HgTe CQDs with well-defined bandtail states, resulting in enhanced excitonic absorption compared to conventional spherical quantum dots. By carefully adjusting the synthesis temperatures, we successfully obtained Short-Wave Infrared (SWIR) CQDs tunable within the range of 1.5 to approximately 3 μm. Furthermore, we improved the long-term stability of the photodetectors by incorporating CdTe nanocrystals, in place of the traditional Ag2Te, as the Hole Transport Layer (HTL). As a result, our SWIR HgTe CQD photodetectors exhibited a room-temperature detectivity of 1.2 × 1011 Jones at the 1.7 μm cutoff absorption edge.
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Binbin Wang, Xingchen Zhang, Huicheng Hu, Zhaorong Shi, Mohan Yuan, and Xinzheng Lan "Improved stability of HgTe quantum dot photodetectors through a CdTe hole transport layer", Proc. SPIE 12921, Third International Computing Imaging Conference (CITA 2023), 129214V (6 November 2023); https://doi.org/10.1117/12.2691909
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KEYWORDS
Photodetectors
Quantum dots
Infrared radiation
Dark current
Short wave infrared radiation
Absorption
Colloidal quantum dots
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