High-Performance and Stable Colloidal Quantum Dots Imager via Energy Band Engineering
In: Nano Letters, Jg. 23 (2023-07-26), Heft 14, S. 6489-6496
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Zugriff:
Solution-processed colloidal quantum dot (CQD) photodiodes are compatible for monolithic integration with silicon-based readout circuitry, enabling ultrahigh resolution and ultralow cost infrared imagers. However, top-illuminated CQD photodiodes for longer infrared imaging suffer from mismatched energy band alignment between narrow-bandgap CQDs and the electron transport layer. In this work, we designed a new top-illuminated structure by replacing the sputtered ZnO layer with a SnO2layer by atomic layer deposition. Benefiting from matched energy band alignment and improved heterogeneous interface, our top-illuminated CQD photodiodes achieve a broad-band response up to 1650 nm. At 220 K, these SnO2-based devices exhibit an ultralow dark current density of 3.5 nA cm–2at −10 mV, reaching the noise limit for passive night vision. The detectivity is 4.1 × 1012Jones at 1530 nm. These SnO2-based devices also demonstrate exceptional operation stability. By integrating with silicon-based readout circuitry, our CQD imager realizes water/oil discrimination and see-through smoke imaging.
Titel: |
High-Performance and Stable Colloidal Quantum Dots Imager via Energy Band Engineering
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Autor/in / Beteiligte Person: | Zhang, Linxiang ; Chen, Long ; Yang, Junrui ; Liu, Jing ; Lu, Shuaicheng ; Liang, Xinyi ; Zhao, Xuezhi ; Yang, Yang ; Hu, Jun ; Hu, Long ; Lan, Xinzheng ; Zhang, Jianbing ; Gao, Liang ; Tang, Jiang |
Zeitschrift: | Nano Letters, Jg. 23 (2023-07-26), Heft 14, S. 6489-6496 |
Veröffentlichung: | 2023 |
Medientyp: | serialPeriodical |
ISSN: | 1530-6984 (print) ; 1530-6992 (print) |
DOI: | 10.1021/acs.nanolett.3c01391 |
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