SEMICONDUCTOR DEVICES

ZnO/Ag nanowires composite film ultraviolet photoconductive detector

Guodong Yan, Minqiang Wang and Zhi Yang

+ Author Affiliations

 Corresponding author: Minqiang Wang, Email: mqwang@mail.xjtu.edu.cn

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Abstract: ZnO/Ag nanowires (NWs) film ultraviolet (UV) detector was fabricated by a simple and low-cost solution-processed method. In order to prepare this device, Ag NWs network was first spin-coated on glass substrate as a transparent conducting electrode, then ZnO NWs arrays were grown vertically on the Ag NWs network based on the hydrothermal method. This UV detector exhibited an excellent detection performance with large on/off ratio and short response time. Several process and working parameters were particularly investigated to analyze the relationship between structure and performance, which include growth time of ZnO NWs array, spin speed of Ag NWs network and working temperature. This UV photoconductive detector is based on two kinds of one-dimension nanomaterials, and it was regarded as a compromise between high performance with large area, low voltage and low cost.

Key words: UV detectorZnO NWs arrayAg NWs



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Fig. 1.  (a) Schematic of the ZnO/Ag NWs UV detector structure. (b) Top and (c) cross section view of the ZnO/Ag NWs UV detector, the insert in (b) is surface morphologies of Ag NWs. (d) The EDS spectra of the cross section of the ZnO/Ag NWs UV detector, the insert shows the EDS spectra of the bottom layer Ag NWs clearly.

Fig. 2.  (a) The XRD pattern of ZnO NWs array, Ag NWs film and ZnO/Ag NWs UV detector. (b) The transmittance spectrum of ZnO NWs array, Ag NWs film and ZnO/Ag NWs UV detector.

Fig. 3.  (Color online) The schematic of the photoresponse process of the ZnO/Ag NWs UV detector. (a) Dark state. (b) Under UV illumination at room temperature. (c) Recovery to dark state. (d) Upon UV illumination at high temperature. (e) Energy level diagram of ZnO and Ag. (f) Schematic of the metastable state absorbing oxygen molecules.

Fig. 4.  (a) I-V curves of ZnO NWs arrays with and without UV illumination. (b) (Color online) Response and recovery characteristics of ZnO NWs array at a bias of 1 V. (c) I-V curves of ZnO/Ag NWs UV detector with and without UV illumination. (d) (Color online) Response and recovery characteristics of ZnO/Ag NWs UV detector at a bias of 1 V.

Fig. 5.  (a) The response and recovery and (b) on/off ratio and photocurrent of different growth time of ZnO NWs array in ZnO/Ag NWs UV detector. (c) The response and recovery and (d) on/off ratio and photocurrent of different spin speed of Ag NWs in ZnO/Ag NWs UV detector.

Fig. 6.  The optical microscope image of ZnO NWs array with different growth time of (a) 20 min, (b) 30 min, (c) 40 min, (d) 50 min in ZnO/Ag NWs UV detector. (e) The optical microscope image of ZnO NPs/Ag NWs seed layer without growing ZnO NWs array; the optical microscope image of Ag NWs networks with different spin speed of (f) 1000 rpm, (g) 2000 rpm, (h) 3000 rpm in ZnO/Ag NWs UV detector.

Fig. 7.  (a) (Color online) The dependence of response and recovery characteristic of ZnO/Ag NWs UV detector on the work temperature. (b) The dependence of response and recovery time on the different work temperature.

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    Received: 08 January 2015 Revised: Online: Published: 01 August 2015

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      Guodong Yan, Minqiang Wang, Zhi Yang. ZnO/Ag nanowires composite film ultraviolet photoconductive detector[J]. Journal of Semiconductors, 2015, 36(8): 084006. doi: 10.1088/1674-4926/36/8/084006 G D Yan, M Q Wang, Z Yang. ZnO/Ag nanowires composite film ultraviolet photoconductive detector[J]. J. Semicond., 2015, 36(8): 084006. doi: 10.1088/1674-4926/36/8/084006.Export: BibTex EndNote
      Citation:
      Guodong Yan, Minqiang Wang, Zhi Yang. ZnO/Ag nanowires composite film ultraviolet photoconductive detector[J]. Journal of Semiconductors, 2015, 36(8): 084006. doi: 10.1088/1674-4926/36/8/084006

      G D Yan, M Q Wang, Z Yang. ZnO/Ag nanowires composite film ultraviolet photoconductive detector[J]. J. Semicond., 2015, 36(8): 084006. doi: 10.1088/1674-4926/36/8/084006.
      Export: BibTex EndNote

      ZnO/Ag nanowires composite film ultraviolet photoconductive detector

      doi: 10.1088/1674-4926/36/8/084006
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      Project supported by the National Natural Science Foundation of China (Nos. 61176056, 91323303, 91123019), the 111 Program (No. B14040), and the Open Projects from the Institute of Photonics and Photo-Technology, Provincial Key Laboratory of Photoelectronic Technology, Northwest University, China.

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      • Corresponding author: Email: mqwang@mail.xjtu.edu.cn
      • Received Date: 2015-01-08
      • Accepted Date: 2015-02-12
      • Published Date: 2015-01-25

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