期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 31, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202100966
关键词
2D materials; infrared; photodetectors; sensors; tunneling
类别
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2018R1A2B2008069]
- KNPA
- MSIT
- MOTIE
- ME
- NFA [2017M3D9A1073539]
- Bio & Medical Technology Development Program of the National Research Foundation (NRF) - Ministry of Science ICT [NRF-2020M3A9E4039241]
- Samsung Research Funding & Incubation Center of Samsung Electronics [SRFC-MA1701-01]
- MSIT (Ministry of Science and ICT), Korea, under the ICT Creative Consilience program [IITP-2020-0-01821]
- Institute for Basic Science [IBS-R011-D1]
This study presents a high sensitivity and fast photoresponse infrared proximity sensor achieved through vdW integration, with applications in both near-infrared and mid-infrared ranges. The sensors exhibit broadband photoresponse and fast response times.
Infrared (IR) detectors based on photo-induced tunneling in van der Waals heterostructures (vdWHs) of graphene/h-BN/graphene or MoS2/h-BN/graphene exhibit extremely low dark currents owing to a large electron barrier. However, a lack of tunneling barrier materials except for h-BN for 2D vdWHs limits their further enhancement. In this study, a broadband detection is reported with high sensitivity and fast photoresponse of IR proximity sensor by a vdW integration (2D-3D) of graphene or MoS2, with NiO/Ni as the IR absorber and hole selective transport layer/counter electrode. The low Schottky barrier height of the reported junctions suppresses dark current with a high detectivity approximate to 10(14) Jones and generates a photocurrent by transporting photo-excited carriers through a low hole barrier at a wide wavelength. Two types of integrated IR proximity sensor applications are developed: a passive sensor (MoS2/NiO/Ni) for the near-IR (NIR) range and an active sensor (Gr/NiO/Ni) for the mid-IR (MIR) range. The former shows a broadband photoresponse to reflect the NIR, while the latter absorbs human body irradiation (2-16 mu m wavelength) with a fast photoresponse of 3.5 s (rise time) and 1.8 s (fall time). The fabricated sensors utilize low power, broadband detection, high sensitivity, fast photoresponse, and large-scale area at room temperature.
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