Abstract

We report the photoresponse performance of plasmonic nickel (Ni) nanoparticles (NPs)-decorated ZnO NR arrays-based ultraviolet (UV) surface photodetectors. The ZnO NR arrays were grown on the Si substrate by the facile hydrothermal method, followed by Ni NP decoration on the surface by pulsed laser deposition (PLD) technique. Raman analyses reveal that the grown ZnO NR arrays are in hexagonal wurtzite structure. The field emission scanning electron microscopy (FE-SEM) shows that the grown ZnO NR arrays are vertically aligned, hexagonal faceted, and uniformly distributed on the Si substrate. The 14-fold enhancement in the UV emission upon Ni NP decoration implies the near-field coupling of surface plasmons (SPs) of Ni NPs with the excitons of ZnO NRs. The linear increase in current with the applied voltage indicates good Ohmic contacts between the ZnO NR arrays and the Ag electrodes. The transient photo-response measurements were performed for every twenty seconds (20 s) ON/OFF time and for nine cycles to study its response speed, stability, and repeatability of the photodetectors. The improved photo-response of the Ni NP-decorated ZnO NR arrays is attributed to the near-field coupling of Ni NPs with the underlying ZnO NRs. The decoration of plasmonic Ni NPs provides better optical pathway for the incident light and transfers its hot electrons to the conduction band of ZnO NR arrays gives rise the improved photoresponse.

中文翻译：

---

基于等离子镍纳米粒子修饰的六角面ZnO纳米棒阵列结构的高性能紫外表面光电探测器

摘要

我们报告等离子镍（Ni）纳米粒子（NPs）装饰的基于ZnO NR阵列的紫外（UV）表面光探测器的光响应性能。ZnO NR阵列通过简便的水热法生长在Si衬底上，然后通过脉冲激光沉积（PLD）技术在表面进行Ni NP装饰。拉曼分析表明，生长的ZnO NR阵列呈六方纤锌矿结构。场发射扫描电子显微镜（FE-SEM）显示，生长的ZnO NR阵列垂直排列，六边形且均匀分布在Si基板上。Ni NP装饰后UV发射增强14倍，意味着Ni NPs的表面等离激元（SPs）与ZnO NRs的激子的近场耦合。电流随施加电压的线性增加表明ZnO NR阵列与Ag电极之间的欧姆接触良好。每隔20秒（20 s）ON / OFF时间和9个周期进行瞬态光响应测量，以研究其响应速度，稳定性和光电探测器的可重复性。Ni NP修饰的ZnO NR阵列的改善的光响应归因于Ni NP与底层ZnO NR的近场耦合。等离子体Ni NPs的装饰为入射光提供了更好的光路，并将其热电子转移到ZnO NR阵列的导带，从而产生了改善的光响应。每隔20秒（20 s）ON / OFF时间和9个周期进行瞬态光响应测量，以研究其响应速度，稳定性和光电探测器的可重复性。Ni NP修饰的ZnO NR阵列的改善的光响应归因于Ni NP与底层ZnO NR的近场耦合。等离子体Ni NPs的装饰为入射光提供了更好的光路，并将其热电子转移到ZnO NR阵列的导带，从而产生了改善的光响应。每隔20秒（20 s）ON / OFF时间和9个周期进行瞬态光响应测量，以研究其响应速度，稳定性和光电探测器的可重复性。Ni NP修饰的ZnO NR阵列的改善的光响应归因于Ni NP与底层ZnO NR的近场耦合。等离子体Ni NPs的装饰为入射光提供了更好的光路，并将其热电子转移到ZnO NR阵列的导带，从而产生了改善的光响应。