UV–Vis–NIR broad spectral photodetectors facilely fabricated with nonmetal plasmonic WO3−x nanosheets
UV–Vis–NIR broad spectral photodetectors facilely fabricated with nonmetal plasmonic WO3−x nanosheets
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DOI：
10.1063/5.0130645
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发表时间：
2022-12
影响因子：
4
通讯作者：
Dongran Wang;Kai Xia;Haibin Tang;Zhulin Huang;Yao Zhang;Xiujuan Wang;G. Fei;G. Meng
中科院分区：
文献类型：
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作者：
Dongran Wang;Kai Xia;Haibin Tang;Zhulin Huang;Yao Zhang;Xiujuan Wang;G. Fei;G. Meng
等离子体金属纳米结构由于其光响应范围和灵敏度的提高，在光电探测器中得到了广泛的应用。相比之下，基于表面等离子体效应的光探测尚未对新兴等离子体非金属进行研究。本文采用单非金属等离子体WO3−x纳米片作为紫外-可见-近红外广谱光电探测器的传感材料。在含氢气氛中，通过溶剂热和后续热处理合成了等离子体WO3−x纳米片，其表面等离子体共振（LSPR）带的中心为899 nm，具有从紫外到近红外的广谱吸收。在WO3−x纳米片薄膜上沉积Au电极制备的光电探测器通过等离子体热自由载流子对电导的调节表现出灵敏的响应。在波长为980 nm、超低偏置为0.01 V的入射光下，响应率和检出率分别为52 mA/W和1.46 × 108 Jones；在0.1 V入射光下，响应率和检出率分别达到538 mA/W和4.75 × 108 Jones。结果表明非金属等离子体材料在光探测方面具有巨大的潜力。
Plasmonic metal nanostructures have been widely applied in photodetectors for the enhanced light response range and sensitivity. In contrast, photodetection based on surface plasmon effect of the emerging plasmonic nonmetals has not been investigated. Here, single nonmetal plasmonic WO3−x nanosheets were used as the sensing material for UV–Vis–NIR broad spectral photodetectors. The plasmonic WO3−x nanosheets were synthesized by solvothermal and follow-up thermal treatment in a hydrogen-containing atmosphere, which exhibited a localized surface plasmon resonance (LSPR) band centered at 899 nm with broad spectral absorption spanned from UV to NIR. Then photodetectors fabricated facilely by depositing Au electrodes on a film of WO3−x nanosheets showed sensitive response for the regulation of conductance through the plasmonic hot free charge carriers. The responsivity and detectivity were 52 mA/W and 1.46 × 108 Jones under an incident light with a wavelength of 980 nm with an ultralow bias of 0.01 V, and went up to 538 mA/W and 4.75 × 108 Jones under 0.1 V. The results demonstrate the great potential of nonmetal plasmonic materials for photodetection.