Ultraviolet photodetector arrays assembled by dielectrophoresis of ZnO nanoparticles
Ultraviolet photodetector arrays assembled by dielectrophoresis of ZnO nanoparticles
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DOI：
10.1088/0957-4484/21/11/115501
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发表时间：
2010-03
期刊：
影响因子：
3.5
通讯作者：
Wenjing Yan;Norman Mechau;H. Hahn;R. Krupke
中科院分区：
文献类型：
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作者：
Wenjing Yan;Norman Mechau;H. Hahn;R. Krupke
通过介电泳组装 ZnO 纳米粒子，可以生产出灵敏且快速的紫外线传感器阵列。亚微米器件尺寸导致低工作电压和低功耗。该装置长期稳定运行，可在空气、氧气和氮气中运行。我们从时间分辨光响应中确定了吸收和解吸动力学，并得出氧气或二氧化碳是光解吸物质的结论。我们可以从低偏置和高偏置光电流的测量中得出器件的载流子浓度和迁移率。通过比较偏置器件的电致发光光谱与 ZnO 分散体的光致发光光谱图，讨论了缺陷的存在。
Sensitive and fast ultraviolet sensor arrays have been produced by dielectrophoretic assembling of ZnO nanoparticles. The sub-micron device dimensions induce low operating voltage and low power consumption. The devices are long-term stable and operate in air, oxygen and nitrogen. We have determined the absorption and desorption dynamics from the time-resolved photoresponse and conclude that oxygen or carbon dioxide are the photodesorbed species. We could derive the charge carrier concentration and mobility of the device from measurements of the low-bias and high-bias photocurrent. The presence of defects is discussed by comparing electroluminescence spectra from biased devices with photoluminescence spectral maps of ZnO dispersions.