Journal
ACS APPLIED NANO MATERIALS
Volume 5, Issue 3, Pages 4515-4523Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.2c00761
Keywords
GaN nanowires; doped MoS2; 1D/2D integrated photodetector; van der Waals heterostructure; type-II band alignment
Funding
- National Key Research and Development Project of China [2018YFB1801902, 2018YFB1801900]
- National Natural Science Foundation of China [52172141, 51727901]
- Guangzhou Basic and Applied Basic Research Project [202002030005]
- Young Elite Scientist Sponsorship Program by CAST [YESS20200016]
- Hong Kong Scholar Program [XJ2019060]
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By constructing GaN nanowire/Nb-doped MoS2 flake hybrid heterostructures, photodetectors with high responsivity, fast response speed, and a wide spectral response range can be realized.
One-dimensional (1D) gallium nitride (GaN) has been used as building blocks to construct optoelectronic nanodevices because of its properties. However, the slow respond speed and narrow spectral detection range of nano-based devices hardly meet the requirements of high-speed and multifunction component development. Herein, we propose a promising strategy to realize photodetectors (PDs) featuring high responsivity, fast response speed, and a wide spectral response range by constructing GaN nanowire/Nb-doped MoS(2 )flake hybrid heterostructures. Thanks to the synergistic effect of GaN and doped MoS2, the integrated device exhibits high responsivity for ultraviolet (365 nm) as well as visible (500 nm) light, and the maximum value is 1.7 x 10(2) and 0.34 A/W. For UV detection, the integrated device shows fast response and its rise/fall time is <8/10 ms, which can rival or surpass many 1D nano-based PDs. Further investigation confirms that the type-II band alignment of the GaN/doped MoS(2 )heterojunction with a conduction band offset and a valence band offset of 0.19 and 2.09 eV, respectively, contributes to the enhanced photogenerated carrier separation and transfer process. The assembled PDs with broad-spectrum photoresponse and fast response speed have great promise as the next-generation hybrid photodetection devices.
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