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High-Performance Ultraviolet Photodetector Based on Graphene Quantum Dots Decorated ZnO Nanorods/GaN Film Isotype Heterojunctions
- Source :
- Nanoscale Research Letters, Nanoscale Research Letters, Vol 13, Iss 1, Pp 1-9 (2018)
- Publication Year :
- 2018
- Publisher :
- Springer Science and Business Media LLC, 2018.
-
Abstract
- A novel isotype heterojunction ultraviolet photodetector was fabricated by growing n-ZnO nanorod arrays on n-GaN thin films and then spin-coated with graphene quantum dots (GQDs). Exposed to UV illumination with a wavelength of 365 nm, the time-dependent photoresponse of the hybrid detectors manifests high sensitivity and consistent transients with a rise time of 100 ms and a decay time of 120 ms. Meanwhile, an ultra-high specific detectivity (up to ~ 1012 Jones) and high photoresponsivity (up to 34 mA W−1) are obtained at 10 V bias. Compared to the bare heterojunction detectors, the excellent performance of the GQDs decorated n-ZnO/n-GaN heterostructure is attributed to the efficient immobilization of GQDs on the ZnO nanorod arrays. GQDs were exploited as a light absorber and act like an electron donor to effectively improve the effective carrier concentration in interfacial junction. Moreover, appropriate energy band alignment in GQDs decorated ZnO/GaN hybrids can also be a potential factor in facilitating the UV-induced photocurrent and response speed.
- Subjects :
- Materials science
Nanochemistry
Photodetector
02 engineering and technology
UV photodetector
Specific detectivity
010402 general chemistry
01 natural sciences
law.invention
law
lcsh:TA401-492
General Materials Science
Photocurrent
Nano Express
Graphene quantum dots
business.industry
Graphene
Heterojunction
021001 nanoscience & nanotechnology
Condensed Matter Physics
0104 chemical sciences
Quantum dot
ZnO nanorod arrays
Optoelectronics
lcsh:Materials of engineering and construction. Mechanics of materials
Nanorod
0210 nano-technology
business
Subjects
Details
- ISSN :
- 1556276X and 19317573
- Volume :
- 13
- Database :
- OpenAIRE
- Journal :
- Nanoscale Research Letters
- Accession number :
- edsair.doi.dedup.....294a58f1238ee6727f6efcc452776994