Very long wave infrared quantum dot photodetector up to 18 μm

Xiaomeng Xue; Qun Hao; Menglu Chen

doi:10.1038/s41377-024-01436-y

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Very long wave infrared quantum dot photodetector up to 18 μm

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- Very long wave infrared quantum dot photodetector up to 18 μm
- Very long wave infrared quantum dot photodetector up to 18 μm
- LSA 2024年13卷第4期页码：772-782
- Affiliations：
- Author bio：
  
  cmenglu@bit.edu.cn
- Funds：
  
  National Natural Science Foundation of China (National Science Foundation of China)
- DOI：10.1038/s41377-024-01436-y
  中图分类号：
- 收稿日期：2023-11-17，
  
  修回日期：2024-03-15，
  
  录用日期：2024-03-20，
  
  网络出版日期：2024-04-12，
  
  纸质出版日期：2024-12
- Accepted：
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Very long wave infrared quantum dot photodetector up to 18 μm[J]. LSA, 2024,13(4):772-782.

Xiaomeng Xue, Qun Hao, Menglu Chen. Very long wave infrared quantum dot photodetector up to 18 μm[J]. Light: science & applications, 2024, 13(4): 772-782.
Very long wave infrared quantum dot photodetector up to 18 μm[J]. LSA, 2024,13(4):772-782. DOI： 10.1038/s41377-024-01436-y.

Xiaomeng Xue, Qun Hao, Menglu Chen. Very long wave infrared quantum dot photodetector up to 18 μm[J]. Light: science & applications, 2024, 13(4): 772-782. DOI： 10.1038/s41377-024-01436-y.

摘要

Abstract

Colloidal quantum dots (CQDs) are of interest for optoelectronic devices because of the possibility of high-throughput solution processing and the wide energy gap tunability from ultraviolet to infrared wavelengths. People may question about the upper limit on the CQD wavelength region. To date

although the CQD absorption already reaches terahertz

the practical photodetection wavelength is limited within mid-wave infrared. To figure out challenges on CQD photoresponse in longer wavelength

would reveal the ultimate property on these nanomater

ials. What’s more

it motivates interest in bottom-up infrared photodetection with less than 10% cost compared with epitaxial growth semiconductor bulk. In this work

developing a re-growth method and ionic doping modification

we demonstrate photodetection up to 18 μm wavelength on HgTe CQD. At liquid nitrogen temperature

the responsivity reaches 0.3 A/W and 0.13 A/W

with specific detectivity 6.6 × 10

Jones and 2.3 × 10

Jones for 18 μm and 10 μm CQD photoconductors

respectively. This work is a step toward answering the general question on the CQD photodetection wavelength limitation.

This work explores the boundary between nanocrystal and relative bulk

expanding the photoresponse wavelength limitation of colloidal quantum dot photodetector up to very long wave infrared.

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references

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