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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Mediating broadband light into graphene-silicon Schottky photodiodes by asymmetric silver nanospheroids: effect of shape anisotropy
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Mediating broadband light into graphene-silicon Schottky photodiodes by asymmetric silver nanospheroids: effect of shape anisotropy

机译：通过非对称银纳米球体介导宽带光进入石墨烯 - 硅舒丝光电二极管：形状各向异性的影响

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摘要

Designing thinner, more efficient and cost-effective 2D materials/silicon Schottky photodiodes using the plasmonic concept is one of the most recent quests for the photovoltaic research community. This work demonstrates the enhanced performance of graphene-Si Schottky junction solar cells by introducing asymmetric spheroidal shaped Ag nanoparticles (NPs) embedded in a graphene monolayer (GML). The optical signatures of these Ag NPs (oblate, ortho-oblate, prolate and ortho-prolate) have been analyzed by discrete dipole approximation in terms of extinction efficiency and surface plasmon resonance tunability, against the quasi-static approximation. The spatial field distribution is enhanced by optimizing the size (a(eff) = 100 nm) and aspect ratio (0.4) for all of the utilized Ag NPs with an optimized graphene environment (t = 0.1 nm). An improvement of photon absorption in the thin Si wafer for the polychromatic spectral region (lambda similar to 300-1100 nm) under an AM 1.5 G solar spectrum has been observed. This resulted in a photocurrent enhancement from 7.98 mA cm(-2) to 10.0 mA cm(-2) for oblate-shaped NPs integrated into GML/Si Schottky junction solar cells as compared to the bare cell. The structure used in this study to improve the graphene-Si Schottky junction's performance is also advantageous for other graphene-like 2D material-based Schottky devices.
机译：使用等离子体概念设计更薄，更高效且经济高效的2D材料/硅肖特基光电二极管是光伏研究界最近的任务之一。该工作通过将嵌入石墨烯单层（GM1）中的不对称球形Ag纳米颗粒（NPS）引入了石墨烯-SI肖特基结太阳能电池的增强性能。在消光效率和表面等离子体共振可调性方面，通过离散的偶极近似来分析这些Ag NPS（扁圆形，扁圆形，增殖和正交）的光学签名，以反对准静态近似。通过优化具有优化石墨烯环境（T = 0.1nm）的所有使用的AG NP的尺寸（a（eff）= 100nm）和纵横比（0.4）来提高空间场分布。已经观察到在AM 1.5G太阳光谱下，在AM 1.5G太阳光谱下，在薄Si晶片中改善了用于多色光谱区（类似于300-1100nm）的微旋光区（Lambda）。与裸电池相比，这导致从7.98 mA cm（-2）到10.0 mA cm（-2）到10.0 mA cm（-2）的光电流增强，而扁平形状的NPS集成到GML / SI肖特基结太阳能电池中。本研究中使用的结构改善石墨烯-SI肖特基结的性能也是有利于其他基于石墨烯的2D材料的肖特基装置。

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