Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 29, Issue 16, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201900129
Keywords
2D; BiOI; chemical vapor deposition; photodetector; UV light irradiation
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Funding
- National Natural Science Foundation of China [11674265]
- Natural Science Basic Research Project of Shaanxi Province [2018JZ6003]
- Research Funds of the State Key Laboratory of Solidification Processing (NWPU) [KP201614]
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Compared to the most studied 2D elements and binary compounds, ternary layered compounds with more adjustable physical and chemical properties have exhibited potential applications in electronic and optoelectronic devices. Here, 2D ternary layered BiOI crystals are synthesized first with a domain size up to 100 mu m via space-confined chemical vapor deposition. The photodetectors based on the as-grown BiOI nanosheets demonstrate high sensitivity to 473 nm light. The I-on/I-off ratio and detectivity of BiOI photodetectors can reach up to 1 x 10(5) and 8.2 x 10(11) Jones at 473 nm, respectively. Particularly, the contact and dark current of the photodetectors can be controlled by 254 nm ultraviolet light irradiation due to the introduction of oxygen vacancies. The facile synthesis of large-area atomically thin BiOI and its controllable performance by ultraviolet light irradiation suggest that 2D BiOI crystal is a promising material for fundamental investigations and optoelectronic applications.
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