School of Engineering-Emerging Technologies, University of Tabriz, Tabriz 5166614761, Iran.
Chemphyschem. 2013 Feb 25;14(3):554-9. doi: 10.1002/cphc.201200660. Epub 2013 Jan 11.
Solution-processed ultraviolet photodetectors based on passivated and unpassivated zinc oxide (ZnO) nanorods, in which the ZnO nanoparticles are synthesized by a hydrothermal method, are demonstrated and characterized. Photoconductive photodetectors fabricated using simple solution processing have recently been shown to exhibit high gains and outstanding sensitivities. One ostensible disadvantage of exploiting photoconductive gain is that the temporal response is limited by the release of carriers from trap states. Herein, specific chemical species are introduced onto the surfaces of ZnO nanoparticles to produce desired trap states with a carefully selected lifetime. Compared with conventional photodetectors based on ZnO nanoparticles, the proposed UV photodetectors have much higher photoresponses and faster response times in the UV region. The photoconductive gain of the fabricated photodetectors varies from 26.83 to 2.32×10(2) for passivated samples, which indicates high gain. The best temporal response for the fabricated detectors is 34 ms rise time and 132 ms decay time for ZnO nanoparticles passivated by hexamethylenetetramine.
基于钝化和未钝化氧化锌 (ZnO) 纳米棒的溶液处理紫外光电探测器得到了展示和特性分析，其中 ZnO 纳米粒子是通过水热法合成的。最近，使用简单的溶液处理工艺制造的光电导型光电探测器已显示出高增益和出色的灵敏度。利用光电导增益的一个明显缺点是，载流子从陷阱态释放会限制时间响应。在此，在 ZnO 纳米粒子的表面上引入特定的化学物质，以产生具有精心选择的寿命的所需陷阱态。与基于 ZnO 纳米粒子的传统光电探测器相比，所提出的紫外光电探测器在紫外区域具有更高的光响应和更快的响应时间。所制备的光电探测器的光电导增益对于钝化样品从 26.83 变化到 2.32×10(2)，表明具有高增益。所制备的探测器的最佳时间响应是用六亚甲基四胺钝化的 ZnO 纳米粒子的 34 ms 上升时间和 132 ms 下降时间。
