Engineering electrode interfaces for telecom-band photodetection in MoS<sub>2</sub>/Au heterostructures via sub-band light absorption

Chengyun Hong; Saejin Oh; Vu Khac Dat; Sangyeon Pak; SeungNam Cha; Kyung-Hun Ko; Gyung-Min Choi; Tony Low; Sang-Hyun Oh; Ji-Hee Kim

doi:10.1038/s41377-023-01308-x

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Engineering electrode interfaces for telecom-band photodetection in MoS₂/Au heterostructures via sub-band light absorption

Original Articles

- Engineering electrode interfaces for telecom-band photodetection in MoS₂/Au heterostructures via sub-band light absorption
- Engineering electrode interfaces for telecom-band photodetection in MoS₂/Au heterostructures via sub-band light absorption
- LSA 2023年12卷第12期页码：2677-2687
- Affiliations：
  
  1.Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea
  2.Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science (IBS), Sungkyunkwan University, Suwon 16419, Republic of Korea
  3.School of Electronic and Electrical Engineering, Hongik University, Seoul 04066, Republic of Korea
  4.Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea
  5.Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455, USA
  6.Department of Physics, Pusan National University, Busan 46241, Republic of Korea
- Author bio：
  
  Tony Low (tlow@umn.edu)
  Sang-Hyun Oh (sang@umn.edu)
  Ji-Hee Kim (kimjihee@pusan.ac.kr)
- Funds：
- DOI：10.1038/s41377-023-01308-x
  中图分类号：
- 纸质出版日期：2023-12-31，
  
  网络出版日期：2023-11-23，
  
  收稿日期：2023-04-04，
  
  修回日期：2023-09-27，
  
  录用日期：2023-10-13
- Accepted：
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Engineering electrode interfaces for telecom-band photodetection in MoS₂/Au heterostructures via sub-band light absorption[J]. LSA, 2023,12(12):2677-2687.

Hong, C. Y. et al. Engineering electrode interfaces for telecom-band photodetection in MoS₂/Au heterostructures via sub-band light absorption. Light: Science & Applications, 12, 2677-2687 (2023).
Engineering electrode interfaces for telecom-band photodetection in MoS₂/Au heterostructures via sub-band light absorption[J]. LSA, 2023,12(12):2677-2687. DOI： 10.1038/s41377-023-01308-x.

Hong, C. Y. et al. Engineering electrode interfaces for telecom-band photodetection in MoS₂/Au heterostructures via sub-band light absorption. Light: Science & Applications, 12, 2677-2687 (2023). DOI： 10.1038/s41377-023-01308-x.

摘要

Abstract

Transition metal dichalcogenide (TMD) layered semiconductors possess immense potential in the design of photonic

electronic

optoelectronic

and sensor devices. However

the sub-bandgap light absorption of TMD in the range from near-infrared (NIR) to short-wavelength infrared (SWIR) is insufficient for applications beyond the bandgap limit. Herein

we report that the sub-bandgap photoresponse of MoS

/Au heterostructures can be robustly modulated by the electrode fabrication method employed. We observed up to 60% sub-bandgap absorption in the MoS

/Au heterostructure

which includes the hybridized interface

where the Au layer was applied via sputter deposition. The greatly enhanced absorption of sub-bandgap light is due to the planar cavity formed by MoS

and Au; as such

the absorption spectrum can be tuned by altering the thickness of the MoS

layer. Photocurrent in the SWIR wavelength range increases due to increased absorption

which means that broad wavelength detection from visible toward SWIR is possible. We also achieved rapid photoresponse (~150 µs) and high responsivity (17 mA W

−1

) at an excitation wavelength of 1550 nm. Our findings demonstrate a facile method for optical property modulation using metal electrode

engineering and for realizing SWIR photodetection in wide-bandgap 2D materials.

关键词

Keywords

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Engineering electrode interfaces for telecom-band photodetection in MoS2/Au heterostructures via sub-band light absorption

Engineering electrode interfaces for telecom-band photodetection in MoS2/Au heterostructures via sub-band light absorption

DOI：10.1038/s41377-023-01308-x

摘要

Abstract

关键词

Keywords

references

Engineering electrode interfaces for telecom-band photodetection in MoS₂/Au heterostructures via sub-band light absorption

Engineering electrode interfaces for telecom-band photodetection in MoS₂/Au heterostructures via sub-band light absorption