High-operating-temperature mid-infrared photodetectors via quantum dot gradient homojunction

Xiaomeng Xue; Menglu Chen; Yuning Luo; Tianling Qin; Xin Tang; Qun Hao

doi:10.1038/s41377-022-01014-0

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High-operating-temperature mid-infrared photodetectors via quantum dot gradient homojunction

Original Articles

- High-operating-temperature mid-infrared photodetectors via quantum dot gradient homojunction
- Light: Science & Applications Vol. 12, Issue 3, Pages: 355-365(2023)
- Affiliations：
  
  1.School of Optics and Photonics, Beijing Institute of Technology, No. 5 Zhongguancun South Street, Beijing, China
  2.Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology, Beijing, China
  3.Yangtze Delta Region Academy of Beijing Institute of Technology, Beijing, China
- Author bio：
  
  Menglu Chen (menglu@bit.edu.cn)
  Xin Tang (xintang@bit.edu.cn)
  Qun Hao (qhao@bit.edu.cn)
- Funds：
- DOI：10.1038/s41377-022-01014-0
  CLC：
- Published：31 March 2023，
  
  Published Online：1 January 2023，
  
  Received：13 July 2022，
  
  Revised：10 October 2022，
  
  Accepted：11 October 2022
Scan for full text
Xue, X.M. et al. High-operating-temperature mid-infrared photodetectors via quantum dot gradient homojunction. Light: Science & Applications, 12, 355-365 (2023).
DOI：

Xue, X.M. et al. High-operating-temperature mid-infrared photodetectors via quantum dot gradient homojunction. Light: Science & Applications, 12, 355-365 (2023). DOI： 10.1038/s41377-022-01014-0.

摘要

Abstract

Due to thermal carriers generated by a narrow mid-infrared energy gap

cooling is always necessary to achieve ideal photodetection. In quantum dot (QD)

the electron thermal generation should be reduced with quantum confinement in all three dimensions. As a result

there would be a great potential to realize high-operating-temperature (HOT) QD mid-IR photodetectors

though not yet achieved. Taking the advantages of colloidal nanocrystals' solution processability and precise doping control by surface dipoles

this work demonstrates a HOT mid-infrared photodetector with a QD gradient homojunction. The detector achieves background-limited performance with

= 2.7 × 10

Jones on 4.2 μm at 80 K

above 10

Jones until 200 K

above 10

Jones until 280 K

and 7.6 × 10

Jones on 3.5 μm at 300 K. The external quantum efficiency also achieves more than 77% with responsivity 2.7 A/W at zero bias. The applications such as spectrometers

chemical sensors

and thermal cameras

are also approved

which motivate interest in low-cost

solution-processed and high-performance mid-infrared photodetection beyond epitaxial growth bulk photodetectors.

关键词

Keywords

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