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Continuous-flow system and monitoring tools for the dielectrophoretic integration of nanowires in light sensor arrays

机译:连续流动系统和监测工具,用于光传感器阵列中纳米线的介电泳整合

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摘要

Although nanowires (NWs) may improve the performance of many optoelectronic devices such as light emitters and photodetectors, the mass commercialization of these devices is limited by the difficult task of finding reliable and reproducible methods to integrate the NWs on foreign substrates. This work shows the fabrication of zinc oxide NWs photodetectors on conventional glass using transparent conductive electrodes to effectively integrate the NWs at specific locations by dielectrophoresis (DEP). The paper describes the careful preparation of NW dispersions by sedimentation and the dielectrophoretic alignment of NWs in a home-made system. This system includes an impedance technique for the assessment of the alignment quality in real time. Following this procedure, ultraviolet photodetectors based on the electrical contacts formed by the DEP process on the transparent electrodes are fabricated. This cost-effective mean of contacting NWs enables front-and back-illumination operation modes, the latter eliminating shadowing effects caused by the deposition of metals. The electro-optical characterization of the devices shows uniform responsivities in the order of 106 A/W below 390 nm under both modes, as well as, time responses of a few seconds
机译:尽管纳米线(NW)可以改善许多光电子器件的性能,例如发光器和光电探测器,但是这些器件的大规模商业化受到寻找可靠和可复制的方法将NW集成到异质衬底上这一艰巨任务的限制。这项工作表明使用透明导电电极在常规玻璃上制造氧化锌NWs光电探测器,以通过介电电泳(DEP)在特定位置有效地集成NWs。本文描述了通过沉淀和在自制系统中NW的介电电泳排列精心制备NW分散体的方法。该系统包括用于实时评估对准质量的阻抗技术。按照该步骤,制造了基于通过DEP工艺在透明电极上形成的电触点的紫外线光电探测器。这种具有成本效益的接触NW的方式可实现前后照明操作模式,后者消除了由金属沉积引起的阴影效应。在两种模式下,器件的电光特性均显示在390 nm以下均具有106 A / W的均匀响应性,以及几秒钟的时间响应

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