ZnO纳米颗粒的紫外光探测器制备及其特性  

Fabrication and characteristics of ZnO nanoparticles ultraviolet photodetector

作　　者：丁和胜 殷磊 袁兆林[1] 黄文登[1] 帅春江[1] 邓建平[2] DING He-sheng;YIN Lei;YUAN Zhao-lin;HUANG Wen-deng;SHUAI Chun-jiang;DENG Jian-ping(L School of Physics and Telecommunication Engineering,Shaanxi University of Technology,Hanzhong 723001,China;Shaanxi Key Laboratory of Industrial Automation,Shaanxi University of Technology,Hanzhong 723001,China)

机构地区：[1]陕西理工大学物理与电信工程学院,陕西汉中723001 [2]陕西理工大学陕西省工业自动化重点实验室,陕西汉中723001

出　　处：《光电子．激光》2018年第10期1058-1063,共6页Journal of Optoelectronics·Laser

基　　金：陕西省自然科学基金(2017JM6090);陕西省教育厅科研基金(16JS016)资助项目

摘　　要：为了发展高性能、低成本和结构简单的ZnO紫外光探测器。在本文中,利用溶液法,制备出ZnO纳米颗粒,采用透射电子显微镜(TEM)、X射线衍射仪(XRD)、紫外-可见分光光度计和荧光光谱仪,分别研究了ZnO纳米颗粒的形貌、晶相结构和光学特性。结果显示:样品呈球形状的颗粒,尺寸分布在6～8.5nm之间,平均粒径为7.1nm,为六方纤锌矿结构。发现ZnO纳米颗粒的陡峭吸收边出现在370nm附近,在390nm处出现一个很强的近带边发射峰和一宽泛的可见光发光带。此外,利用制备的ZnO纳米颗粒,旋涂在刻蚀有叉指电极的FTO(SnO_2:F)上,制备出紫外光探测器,测试了它在暗态和365nm紫外光照下的电流-电压(I-V)和电流-时间(I-t)特性。结果表明:紫外光探测器的灵敏度、光响应度、响应时间、恢复时间分别为62.4(在-3.5V处),13.6A/W(在+5V处),15s和79s。另外,它的光响应机理主要由于ZnO纳米颗粒表面吸附的氧起主导作用。In order to develop low-cost ZnO ultraviolet photodetectors with high performance and simple structure,in this paper,ZnO nanoparticles were prepared by a solution method. The morphology,crystal- line structure and optical properties of ZnO nanoparticles were investigated by field emission scanning e- lectron microscopy （FESEM）, X-ray diffractometer （XRD）, ultraviolet-visible （UV-Vis） spectropho- tometer and fluorescence spectroscopy,respectively. The experimental results show that the samples are nanopartieles with spherical shape,their size distribution ranges from 6 nm to 8.5 nm, and the average diameter of ZnO nanoparticles with hexagonal wurtzite structure is 7.1 nm. A sharp absorption edge at about 370 nm can be observed,and both a strong near edge emission peak at 390 nm and a broad visible light emission band can be found. Moreover, using the as-prepared ZnO nanoparticles, an ultraviolet pho- todetector was fabricated on the fluorine tin oxide coated glass substrate （FTO） patterned interdigital e- lectrodes. Both the current-voltage and current time characteristics of the ultraviolet photodetector were examined in the dark and under 365 nm UV illumination. The results display that the sensitivity,photo- responsivity,response time and recovery time of the photodetector are 62.4 at --3.5 V,13.6 A/W at ＋ 5 V, 15 s,and 79 s, respectively. In addition, the photoresponse mechanism of the ultraviolet detector is mainly that the oxygen adsorbed orl the surface of ZnO nanoparticles plays a central role.

关 键 词：ZnO纳米颗粒 紫外光探测器 灵敏度 光响应度 

分 类 号：TN361[电子电信—物理电子学]