Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 24, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202111673
Keywords
anisotropy; chemical vapor deposition; KNb; O-3; (8) nanobelts; solar-blind ultraviolet photodetectors; ultrawide bandgap
Categories
Funding
- National Natural Science Foundation of China [51972204, 62125404]
- Natural Science Basic Research Plan in Shaanxi Province [2018JQ5192]
- Science and Technology Program of Shaanxi Province [2017KJXX-16]
- Fundamental Research Funds for the Central Universities in Shaanxi Normal University [GK201802003]
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This study reports a polarization sensitive solar-blind ultraviolet photodetector based on ultrathin KNb3O8 nanobelts synthesized via chemical vapor deposition growth. The device exhibits superior photodetection performances in the solar-blind ultraviolet region and displays polarization sensitive photoresponse.
Low-dimensional ultrawide bandgap semiconductors demonstrate great potential in fabricating solar-blind ultraviolet photodetectors. However, the widespread use of detectors is still limited by the low responsivity, large noise, and dark current, and especially few detectors can fulfill the solar-blind ultraviolet detection and the polarization dependence simultaneously. Herein, a polarization sensitive solar-blind ultraviolet photodetector based on ultrathin KNb3O8 nanobelts synthesized via chemical vapor deposition growth, is reported. By selecting suitable substrate and tuning the growth temperature, the nonlayered KNb3O8 crystal is grown into the quasi-1D ultrathin nanobelt with thickness in the range of 4.8-120 nm. Density functional theory calculations and experimental results indicate that the ultrathin KNb3O8 nanobelt possesses an ultrawide bandgap (4.15 eV) as well as unusual in-plane structural anisotropy. Benefiting from the above features, the ultrathin KNb3O8 nanobelt-based device exhibits superior photodetection performances with high responsivity (30 A W-1), high detectivity (5.95 x 10(11) Jones), and ultralow dark current (7.1 x 10(-15) A) in the solar-blind ultraviolet region (230-280 nm). In addition, the KNb3O8 photodetector displays strong polarization sensitive photoresponse with a linear dichroic ratio of 1.62 at 254 nm. With these remarkable features, the ultrathin KNb3O8 nanobelt provides great opportunities for designing the next-generation multifunctional solar-blind ultraviolet optoelectronic devices.
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