Ben Elkamel Imen, Hamdaoui Nejeh, Mezni Amine, Ajjel Ridha, Beji Lotfi
Laboratoire des Energies et des Matériaux, LabEM-LR11ES34, Ecole Supérieure des Sciences et de la Technologie, Université de Sousse Rue Lamine Abessi 4011, Hammam Sousse Tunisia
Institut Supérieur des Technologies de l'Informatique et de la Communication, Université de Sousse Gp1, 4011 Hammam Sousse Tunisia.
RSC Adv. 2018 Sep 19;8(56):32333-32343. doi: 10.1039/c8ra05567j. eCollection 2018 Sep 12.
This study involves the novel fabrication of a high responsivity, fast response, and low-cost (UV) photodetector (PD) based on ZnO/Ni nanoparticles deposited on a glass substrate. The ZnO/Ni nanoparticles were synthesized using a polyol process. The structure and the morphology of the samples were characterized by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM). Optical properties were measured using UV-visible, diffuse reflectance and photoluminescence (PL) spectroscopy. The photodetector exhibited high photoresponse characteristics under 375 nm laser excitation. Our device shows a high responsivity (121 A W) with rise time (about 5.52 s) and fall time (about 12 s) at a bias voltage of 1 V. The device exhibits excellent reproducibility and stability characteristics with time. The noise spectra obtained from the UV photodetector were caused by the 1/ noise. The noise-equivalent power (NEP) is 1.08 × 10 W. Thus, the polyol process can be a useful and effective method for improving the performance of ZnO/Ni UV photodetectors.
本研究涉及基于沉积在玻璃基板上的ZnO/Ni纳米颗粒，新颖制备一种高响应度、快速响应且低成本的（紫外）光电探测器（PD）。采用多元醇法合成了ZnO/Ni纳米颗粒。通过X射线衍射（XRD）和透射电子显微镜（TEM）对样品的结构和形貌进行了表征。使用紫外可见、漫反射和光致发光（PL）光谱测量了光学性质。该光电探测器在375 nm激光激发下表现出高光响应特性。我们的器件在1 V偏置电压下具有高响应度（121 A/W），上升时间（约5.52 s）和下降时间（约12 s）。该器件随时间表现出优异的可重复性和稳定性特性。从紫外光电探测器获得的噪声光谱是由1/f噪声引起的。噪声等效功率（NEP）为1.08×10 W。因此，多元醇法可以成为提高ZnO/Ni紫外光电探测器性能的一种有用且有效的方法。
