Ultrahigh Infrared Photoresponse from Core-Shell Single-Domain-VO2/V2O5 Heterostructure in Nanobeam
Ultrahigh Infrared Photoresponse from Core-Shell Single-Domain-VO2/V2O5 Heterostructure in Nanobeam
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纳米束核壳单域 VO2/V2O5 异质结构的超高红外光响应
DOI：
10.1002/adfm.201302967
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发表时间：
2014-04-01
影响因子：
19
通讯作者：
Xie, Yi
中科院分区：
文献类型：
--
作者：
Li, Zejun;Hu, Zhenpeng;Xie, Yi
红外（IR）捕获和探测太阳光谱的红色和近红外（NIR）部分一直是一个长期的研究领域的强烈兴趣。然而，有限的选择，目前的光活性材料显着阻碍了在室温条件下实现的NIR灵敏度。这需要探索新的光活性材料和制造新的光活性结构设计的能力。本文提出了一种新的氧化物类光导近红外探测器，该探测器由具有内部单畴单斜VO 2（M）核和外部V2 O 5壳的核/壳纳米束异质结构（CSNH）构建，是第一个由过渡金属氧化物（TMOs）制成的光导红外探测器。由于TMO异质结界面的良好限定，在室温下获得了2873.7A W ~（-1）的光电响应率和9.23 × 10 ~（12）Jones的比探测率（990 nm; 0.2 mW cm（-2）），记录最好的性能相比，那些报道的红外探测器的基础上的重金属免费材料，并且甚至比得上/上级于由包括重金属的材料制成的那些传统材料。这些发现为设计氧化物异质结构在光电和能量收集纳米器件中的有趣应用铺平了新的道路。
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.