期刊
ADVANCED FUNCTIONAL MATERIALS
卷 24, 期 13, 页码 1821-1830出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201302967
关键词
single-domain nanobeams; vanadium dioxides; heterostructures; photoconductive infrared detectors; metal-insulator transition
类别
资金
- National Basic Research Program of China [2009CB939901]
- National Natural Science Foundation of China [21222101, 11074229, 11132009, 11079004, 90922016, J1030412]
- Chinese Academy of Science [XDB01020300]
- Fundamental Research Funds for the Central Universities [WK2340000035, WK2310000024]
- NSFC [21203099]
Infrared (IR) harvesting and detection in red and near-IR (NIR) part of the solar spectrum have always been a long-term research area of intense interest. However, limited choices of current photoactive materials have significantly hampered the realization of ultrahigh IR sensitivity under room temperature conditions. The trigger for this requires the exploration of new photoactive materials and the ability to fabricate new photoactive structural design. Herein, a new oxide-catalogue photoconductive NIR detector with ultrahigh performance built by core/shell nanobeam heterostructures (CSNHs) with the inner single-domain monoclinic VO2 (M) core and outer V2O5 shell, which is the first example of photoconductive IR detector made from transition metal oxides (TMOs), is presented. Benefited from the well-defined TMO heterojunction interface, the ultrahigh responsivity (R) of 2873.7 A W-1 and specific detectivity (D*) of 9.23 x 10(12) Jones are achieved at room temperature (at 990 nm; 0.2 mW cm(-2)), recording the best performance compared with those reported IR detectors based on heavy-metal-free materials, and even comparable/superior to those traditional ones made from materials including heavy metals. These findings pave a new way to design oxide heterostructures for intriguing applications in optoelectronic and energy harvesting nanodevices.
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