Zinc Stannate Nanocrystal-Based Ultrarapid-Response UV Photodetectors
Zinc Stannate Nanocrystal-Based Ultrarapid-Response UV Photodetectors
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锡酸锌纳米晶体超快速响应紫外光电探测器
DOI：
10.1002/admt.201800085
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发表时间：
2018-06-01
影响因子：
6.8
通讯作者：
Zeng, Haibo
中科院分区：
文献类型：
--
作者：
Dong, Yuhang;Wang, Shalong;Zeng, Haibo
三元氧化物纳米结构由于其组成可调的禁带宽度和较好的光电导性而成为最有希望的紫外光探测器的候选材料。然而，组装膜基UV PD通常表现出较差的响应速度，因为纳米结构的内部缺陷和组装膜的不连续性阻碍了电荷的传输。本文报道了一种单晶Zn_2SnO_4（ZTO）_（NC）组装薄膜紫外光探测器，其响应速度提高了几十倍（τ（上升）约为0.2ms，τ（衰减）约为0.43ms）。UV PD的I-光/I-暗比大于10（3）。采用液相激光烧蚀结合水热反应的方法制备了禁带宽度为3.9eV的ZTO纳米晶。研究了Zn-Sn-O三元氧化物的结合和解离，以保证单晶ZTO纳米晶具有高纯度、清洁的表面、高的比表面积。此外，NC组装的膜是高度致密和连续的，这优于传统的1D纳米结构。本工作为进一步提高紫外光电二极管的性能提供了一种可靠的新方法。
Ternary-oxide nanostructures are the most investigated as promising candidates for ultraviolet (UV) photodetectors (PDs) due to composition tunable bandgap and better photoconductivity. However, the assembled film-based UV PDs generally exhibit poor response speed because the internal defects of nanostructures and the discontinuity of assembled film obstruct transport of charges. Herein, a single-crystal Zn2SnO4 (ZTO) nanocrystal (NC)-assembled film UV photodetector is reported, improving the response speed several tens of times (tau(rise) approximate to 0.2 ms, tau(decay) approximate to 0.43 ms). The I-light/I-dark ratio of the UV PD is over 10(3). The ZTO NCs, with the bandgap of 3.9 eV, are prepared by laser ablation in liquid combined with hydrothermal reaction. The combination and dissociation of Zn-Sn-O ternary oxide are investigated to guarantee that single-crystal ZTO NCs have high purity, clean surface, high specific surface area. Moreover, the NC-assembled film is highly compact and continuous, which outperforms the conventional 1D nanostructures. This work provides a reliable novel approach to greatly improve the performances of UV PDs.