Low-frequency noise properties of MgZnO nanorod ultraviolet photodetectors with and without UV illumination
Low-frequency noise properties of MgZnO nanorod ultraviolet photodetectors with and without UV illumination
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DOI：
10.1016/j.sna.2017.11.044
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发表时间：
2018
影响因子：
4.6
通讯作者：
S. Young;Yi-Hsing Liu
中科院分区：
文献类型：
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作者：
S. Young;Yi-Hsing Liu
在掺镁 ZnO (MZO) 纳米棒光电探测器 (PD) 上进行低频电流噪声测量，在黑暗和紫外线 (UV) 照射下均观察到 1/f 噪声。结果显示，纳米棒的平均长度和直径分别为 609 nm 和约 50 nm。 X射线衍射图谱显示Mg掺杂ZnO纳米棒具有纤锌矿六方结构。纳米棒的光电性能在紫外照射下稳定。由此产生的镁掺杂氧化锌纳米棒在紫外光电探测器应用中具有巨大的潜力。掺镁氧化锌纳米棒紫外光电探测器具有高紫外可见光比和快速的上升/下降时间。掺镁 ZnO 纳米棒光电探测器的动态响应稳定且可重复，开/关电流对比度约为 4 × 103。当偏压为 1 V 时，样品的紫外-可见光抑制比约为 400，并且所制造的紫外光电探测器是可见光盲，在 350 nm 处具有锐截止。从紫外光电探测器获得的低频噪声光谱是由 1/f 噪声引起的。掺镁 ZnO 纳米棒 PD 的噪声等效功率 (NEP) 和归一化探测率 (D*) 分别为 3.35 × 10−10W 和 1.49 × 108cm Hz0.5 W−1。在紫外线照射下，NEP 和 D* 分别为 1.8 × 10−6W 和 2.7 × 106 cm Hz0.5 W−1。
Low-frequency current noise measurements were performed on Mg-doped ZnO (MZO) nanorod photodetectors (PD), and 1/f noise was observed in both dark and under ultraviolet (UV) illumination. Results show that the average length and diameter of the nanorods were 609 nm and approximately 50 nm, respectively. The X-ray diffraction spectrum showed that the Mg-doped ZnO nanorods had a wurtzite hexagonal sturcture. The photoelectric properties of the nanorods were stable under UV illumination. The resulting Mg-doped ZnO nanorods had excellent potential for UV photodetector applications. Mg-doped ZnO nanorod UV photodetectors had a high UV-to-visible ratio and a fast rise/fall time. The dynamic response of the Mg-doped ZnO nanorod photodetector was stable and reproducible with an on/off current contrast ratio of approximately 4 × 103. The UV-to-visible rejection ratio of the sample was approximately 400 when biased at 1 V, and the fabricated UV photodetector was visible-blind with a sharp cutoff at 350 nm. The low-frequency noise spectra obtained from the UV photodetector were caused by the 1/f noise. The noise-equivalent power (NEP) and normalized detectivity (D*) of the Mg-doped ZnO nanorod PD were 3.35 × 10−10W and 1.49 × 108cm Hz0.5 W−1, respectively. Under UV illumination, the NEP and D*were 1.8 × 10−6W and 2.7 × 106 cm Hz0.5 W−1, respectively.