In this study, we present a broadband nano-photodetector based on single-layer graphene (SLG)-carbon nanotube thin film (CNTF) Schottky junction. It was found that the as-fabricated device exhibited obvious sensitivity to a wide range of illumination, with peak sensitivity at 600 and 920 nm. In addition, the SLG-CNTF device had a fast response speed (τr = 68 μs, τf = 78 μs) and good reproducibility in a wide range of switching frequencies (50–5400 Hz). The on-off ratio, responsivity, and detectivity of the device were estimated to be 1 × 102, 209 mAW−1 and 4.87 × 1010 cm Hz1/2 W−1, respectively. What is more, other device parameters including linear performance θ and linear dynamic range (LDR) were calculated to be 0.99 and 58.8 dB, respectively, which were relatively better than other carbon nanotube based devices. The totality of the above study signifies that the present SLG-CNTF Schottky junction broadband nano-photodetector may have promising application in future nano-optoelectronic devices and systems.
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机译:在这项研究中,我们提出了一种基于单层石墨烯(SLG)-碳纳米管薄膜(CNTF)肖特基结的宽带纳米光电探测器。结果发现,所制造的器件对宽范围的照明表现出明显的灵敏度,其峰值灵敏度分别为600和920nm。此外,SLG-CNTF器件具有较快的响应速度(τr= 68μs,τf= 78μs),并且在宽范围的开关频率(50-5400 Hz)中具有良好的可重复性。该设备的开关比,响应度和检测率分别为1×10 2 sup>,209 mAW -1 sup>和4.87×10 10 sup> cm Hz 1/2 sup> W -1 sup>。而且,包括线性性能θ和线性动态范围(LDR)在内的其他器件参数经计算分别为0.99和58.8 dB,相对优于其他基于碳纳米管的器件。以上研究的总体表明,目前的SLG-CNTF肖特基结宽带纳米光电探测器在未来的纳米光电器件和系统中可能具有广阔的应用前景。
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