Ultrahigh Infrared Photoresponse from Core–Shell Single‐Domain‐VO2/V2O5 Heterostructure in Nanobeam |
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Authors: | Zejun Li Zhenpeng Hu Jing Peng Changzheng Wu Yuchen Yang Feng Feng Peng Gao Jinlong Yang Yi Xie |
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Affiliation: | 1. Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, P. R. China;2. School of Physics, Nankai University, Tianjin, P. R. China;3. Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah, USA;4. Department of Modern Mechanics, University of Science and Technology of China, Hefei, Anhui, P. R. China |
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Abstract: | 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 (Rλ) of 2873.7 A W‐1 and specific detectivity (D*) of 9.23 × 1012 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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Keywords: | single‐domain nanobeams vanadium dioxides heterostructures photoconductive infrared detectors metal‐insulator transition |
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