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In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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从可调节电子亲和半导体阴极发出的热电子光辐射.

Ragib Ahsan1, Anika Tabassum Priyoti1, Jun Meng2

  • 1Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, California 90089, United States.

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概括

我们使用半导体/绝缘体/石墨烯结构开发了一种可调节电压的负电子亲和度 (NEA) 光阴极. 这种稳定,热电子激光辅助阴极 (HELAC) 对未来的应用具有前景,尽管尚未实现最佳性能.

关键词:
蒙特卡洛模拟的蒙特卡洛模拟电子排放的电子排放.电子运输是一种电子运输.热电子的热电子是什么负电子亲缘关系的电子亲缘关系.摄像电解极是光学电解极.

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科学领域:

  • 半导体物理 半导体物理
  • 材料科学是一种材料科学.
  • 量子电子学 量子电子学

背景情况:

  • 传统的化负电子亲和度 (NEA) 光阴极在环境条件下缺乏稳定性.
  • 一种新的方法是利用半导体/绝缘体/石墨烯异构结构用于电压调节的NEA表面.
  • 这使得绝缘体内的电子注入和加热成为可能,从而创建一个可调节的排放屏障.

研究的目的:

  • 实验证明和理论研究一个可调节电压的NEA半导体光阴管.
  • 探索热电子激光辅助阴极 (HELAC) 对高性能电子发射的潜力.
  • 了解其局限性,并指导NEA光阴极的未来设计.

主要方法:

  • 基于p-Si/无形Al2O3/石墨烯的HELAC的制造和表征.
  • 开发一个全频段的蒙特卡罗博尔兹曼运输方程 (MCBTE) 解析器.
  • 在晶体绝缘体 (SiO2,Al2O3,MgO) 中模拟热电子传输和设备性能.

主要成果:

  • 实验证明HELAC的峰值排放电流密度为2.253 × 10−3 A/cm2,峰值外部量子效率 (EQE) 为~1.53%的实验证明.
  • 理论预测的峰值排放电流密度为~103A/cm2使用MCBTE和设备模拟.
  • 鉴定实验和理论性能之间的显著差距,表明优化空间.

结论:

  • 开发的HELAC显示了电压调节性和环境稳定性,比现有的NEA光阴极具有优势.
  • 该理论框架为热电子传输提供了洞察力,并确定了关键的性能限制.
  • 进一步的优化和材料选择对于实现这些先进的NEA光阴极的全部潜力至关重要.