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首页> 外文会议>IEEE International Conference on Nanotechnology >Persistent plasmonic photoconductivity of graphene on silver nanoparticles coated SiO2/Si
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Persistent plasmonic photoconductivity of graphene on silver nanoparticles coated SiO2/Si

机译：石墨烯对银纳米颗粒涂层SiO2 / Si的持续等离子体光电导

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摘要

Effects of plasmonic coupling on blue laser induced positive and negative photoconductivity of chemically vapor deposited mono-layer graphene transferred onto SiO2/Si with or without silver nanoparticles in ambient atmosphere are reported. Ggraphene on silver nanoparticles coated SiO2/Si exhibits negative and rapidly decreasing photoconductivity upon light illumination. The photoconductivity recovers gradually and then become positive photoconductivity. In the subsequent on-off cycles of light illumination, the graphene exhibits positive photoconductivity. Graphene on SiO2/Si without silver nanoparticles also exhibits negative and rapidly decreasing photoconductivity upon light illumination followed by a gradual increase in conductivity. However, the negative photoconductivity persists for a test period longer than 30 hours when light is turned on and off. Adverse effects on electrical conductivity due to electron scattering by surface and interfacial charges, decrease in surface dopants due to desorption induced by incident photons, plasmonic coupling induced local electromagnetic fields combined with enhanced electron transport between silver nanoparticles, and photon generated electron-hole pairs in silicon contribute to the measured photoconductivity. Annealing by electrical current and Joule heating adds to the complexity of the observed effects of current density on positive and negative persistent photoconductivity.
机译：报道了等离子体耦合对在与环境气氛中转移到SiO2 / Si上的化学气相沉积的单层石墨烯的蓝色激光诱导的正极光电导性的影响。 Ggraphene上的银纳米颗粒在光照射涂覆的SiO 2 / Si的表现为负和迅速下降的光电导性。光电导率逐渐恢复，然后变为正光电导。在随后的光照循环中，石墨烯表现出正光电导。在没有银纳米粒子的SiO 2 / Si上的石墨烯也表现出在光照照射时的光电导，然后逐渐增加导电性。然而，在打开和关闭光线时，负光电导性持续到长于30小时的测试时间。上的导电性由于电子散射通过表面和界面电荷，降低表面的掺杂剂由于通过入射光子诱导解吸不利影响，等离激元耦合感应局部电磁场与银纳米颗粒之间的增强的电子传输组合，并且在光子产生的电子 - 空穴对硅有助于测量的光电导。通过电流和焦耳加热退火增加了电流密度对正和负持续光电导性的观察到的复杂性。

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