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Superior Plasmonic Photodetectors Based on Au@MoS2 Core-Shell Heterostructures
Yuan Li1, Jennifer G DiStefano1, Akshay A Murthy1
1Department of Materials Science and Engineering, ‡Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, §International Institute for Nanotechnology (IIN), and ∥Department of Mechanical Engineering, Northwestern University , Evanston, Illinois 60208, United States.
ACS Nano
|September 22, 2017
Summary
Plasmonic photodetectors using gold nanoparticles coated with molybdenum disulfide (Au@MoS2) show significantly improved light detection. These advanced materials offer higher photoresponsivity for next-generation photosensing applications.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Integrating plasmonic materials with semiconductors enhances light-matter interactions for applications like photosensing and solar energy.
- An intimate interface between plasmonic nanostructures and semiconductors is crucial for efficient charge transfer in light-harvesting devices.
Purpose of the Study:
- To develop novel plasmonic photodetectors utilizing gold-molybdenum disulfide (Au@MoS2) heterostructures.
- To investigate the application of these heterostructures in various photosensing devices, including field-effect phototransistors and photodetectors.
Main Methods:
- Fabrication of Au@MoS2 heterostructures with an intimate interface between gold nanoparticle cores and CVD-grown multilayer MoS2 shells.
- Development of large-area interdigitated field-effect phototransistors and Si-supported Au@MoS2 heterojunction gateless photodiodes.
Main Results:
- The Au@MoS2 field-effect phototransistors exhibited a photoresponsivity approximately 10 times higher than planar MoS2 transistors.
- The Au@MoS2 heterojunction gateless photodiode demonstrated a high photoresponsivity of 22.3 A/W, surpassing previously reported values.
- Enhanced photosensing performance is attributed to improved light absorption, increased trap states, and interfacial charge-transfer transitions.
Conclusions:
- Au@MoS2 heterostructures offer a promising platform for high-performance photosensing devices.
- The intimate interface between gold and MoS2 is key to achieving superior photoresponse and recovery abilities.