2013
DOI: 10.1088/1674-1056/22/1/018502
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Enhancing UV photosensitivity of a ZnO UV nanosensor using electrical stimulation at megahertz frequency

Abstract: We report a novel technique to enhance the ultraviolet (UV) photosensitivity of a ZnO nanosensor with ZnO nanowires bridged on micromachined metallic electrodes. The experimental results reveal that the photoconductivity and the time response of the ZnO nanowire sensor with either Schottky or Ohmic contacts are significantly improved by electrifying the nanowire sensors using an alternating current at the frequency of megahertz. An integrated UV sensor incorporating ZnO nanowires with a constant current mode d… Show more

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Cited by 6 publications
(6 citation statements)
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“…[1] Therefore, they have attracted a lot of attention as promising materials with broad applications in piezoelectric nanogenerators, [2] UV sensors, [3] lightemitting diodes, [4] etc. In the study of UV sensors, a majority of ZnO films [4,5] and nanostructures [6][7][8][9][10][11] exhibit a slow photoresponse, which was usually supposed to be attributed to the slow surface adsorption and desorption processes of oxygen molecules. [6][7][8][9][10] In practical applications, the response time of a sensor is a critical performance index.…”
Section: Introductionmentioning
confidence: 99%
“…[1] Therefore, they have attracted a lot of attention as promising materials with broad applications in piezoelectric nanogenerators, [2] UV sensors, [3] lightemitting diodes, [4] etc. In the study of UV sensors, a majority of ZnO films [4,5] and nanostructures [6][7][8][9][10][11] exhibit a slow photoresponse, which was usually supposed to be attributed to the slow surface adsorption and desorption processes of oxygen molecules. [6][7][8][9][10] In practical applications, the response time of a sensor is a critical performance index.…”
Section: Introductionmentioning
confidence: 99%
“…[1][2][3][4][5][6] ZnO nanomaterials with significantly novel and improved physical, chemical, and biological properties and functionality due to their nanoscale sizes have aroused much interest in near-UV emission, gas sensors, transparent conductor, optoelectronics, and piezoelectric application. [7][8][9][10][11][12][13] Most of the ZnO nanomaterials have been synthesized by the traditional high temperature solid state method, which is energy-consuming and difficult to control the particle properties. ZnO nanoparticles can be prepared on a large scale at low cost by simple solution-based methods, such as microemulsion synthesis, [3] sol-gel synthesis, [4] chemical precipitation, [7] and hydrothermal reaction.…”
Section: Introductionmentioning
confidence: 99%
“…Owing to their wide band gap energy (3.3 eV), high electron binding energy (60 meV), high electron mobility and large piezoelectric coefficient, 1,2 one-dimensional ZnO nanorods (NRs) and nanowires (NWs) have attracted a lot of interest as promising materials with broad applications in piezoelectric nanogenerators, 3,4 UV sensors, [5][6][7] light-emitting diodes, 8 solar cells 9,10 and so on. The growth techniques of ZnO nanorods and nanowires can be mainly classified into two categories: vapor-phase methods and wet chemical methods.…”
Section: Introductionmentioning
confidence: 99%
“…In order to collect functional signals of ZnO NRs or NWs, an additional fabrication process is needed to construct electrodes on the nanomaterials or an assembly process is necessary to place the pre-synthesized nanomaterials on and between two preprepared electrodes. 4,6,7,18 Compared with vapor-phase methods, the wet chemical method has the merits of low temperature (below 100 °C), low cost and compatibility with micromachined structures. 19,20 Therefore, it provides more choices for substrates and enables mass production.…”
Section: Introductionmentioning
confidence: 99%