Towards substrate engineering of graphene-silicon Schottky diode photodetectors.
Towards substrate engineering of graphene-silicon Schottky diode photodetectors.
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DOI：
10.1039/c7nr09591k
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发表时间：
2017-06
期刊：
影响因子：
6.7
通讯作者：
H. Selvi;N. Unsuree;E. Whittaker;M. Halsall;E. Hill;A. Thomas;P. Parkinson;T. Echtermeyer
中科院分区：
文献类型：
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作者：
H. Selvi;N. Unsuree;E. Whittaker;M. Halsall;E. Hill;A. Thomas;P. Parkinson;T. Echtermeyer
石墨烯-硅肖特基二极管光电探测器具有诸如高响应率和高探测率、宽光谱波长操作和高操作速度的有益特性。过去已经采用各种路线和架构来制造器件。器件通常基于在将石墨烯沉积在硅的顶部上以形成石墨烯-硅肖特基结之前通过湿法蚀刻去除硅表面上的氧化硅层。在这项工作中，我们系统地研究了界面氧化层，所采用的制造技术和硅衬底上的石墨烯-硅肖特基二极管光电探测器的光探测能力的影响。在从近紫外到短/中红外辐射的宽波长范围内，辐射强度覆盖超过五个数量级，以及高速操作的设备的适用性的设备的性能进行了研究。结果表明，界面层，根据所需的应用，实际上是有益的，以提高这种设备的光电探测性能。此外，我们证明了硅衬底上的光谱响应和操作速度的影响。制造的设备操作在宽光谱波长范围内从近紫外线到短/中红外（热）波长制度，表现出高的光电压响应接近106 V W-1和短的上升和下降时间几十纳秒。
Graphene-silicon Schottky diode photodetectors possess beneficial properties such as high responsivities and detectivities, broad spectral wavelength operation and high operating speeds. Various routes and architectures have been employed in the past to fabricate devices. Devices are commonly based on the removal of the silicon-oxide layer on the surface of silicon by wet-etching before deposition of graphene on top of silicon to form the graphene-silicon Schottky junction. In this work, we systematically investigate the influence of the interfacial oxide layer, the fabrication technique employed and the silicon substrate on the light detection capabilities of graphene-silicon Schottky diode photodetectors. The properties of devices are investigated over a broad wavelength range from near-UV to short-/mid-infrared radiation, radiation intensities covering over five orders of magnitude as well as the suitability of devices for high speed operation. Results show that the interfacial layer, depending on the required application, is in fact beneficial to enhance the photodetection properties of such devices. Further, we demonstrate the influence of the silicon substrate on the spectral response and operating speed. Fabricated devices operate over a broad spectral wavelength range from the near-UV to the short-/mid-infrared (thermal) wavelength regime, exhibit high photovoltage responses approaching 106 V W-1 and short rise- and fall-times of tens of nanoseconds.