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相关概念视频

MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity arises...

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在基于InAs的光探测器中,用于减少暗电流的AlInAs级别缓冲器.

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    科学领域:

    • 材料科学 材料科学 材料科学
    • 半导体物理 半导体物理
    • 光电学是指光电子产品.

    背景情况:

    • 格子不匹配的异构结构在设备性能方面存在由于缺陷而导致的挑战.
    • 在化 (GaAs) 基板上的化 (InAs) 光探测器需要有效的缓冲层来减轻应变.
    • 暗流是限制光探测器灵敏度的关键参数,特别是在高温下.

    研究的目的:

    • 为InAs/GaAs异质连接光二极管结构实施和评估一个分级的AlInAs缓冲层.
    • 为了减少暗电流,并提高网格不匹配的光电探测器的性能.
    • 为了研究阶段级缓冲器的结构和光学特性.

    主要方法:

    • InAs光二极管的分子束表 (MBE) 增长,使用了一种新的阶段级AlInAs缓冲器.
    • 横截面传输电子显微镜 (TEM) 和能量分散光谱 (EDS) 用于结构分析.
    • 现场曲率监测和X射线衍射 (XRD) 用于应变放松和层验证.

    主要成果:

    • 阶级级的AlInAs缓冲器成功地适应了InAs和GaAs之间的7%的格子不匹配.
    • TEM成像显示了分级缓冲区内的脱位曲,表明有效的应变管理.
    • 与参考设备相比,具有阶段级缓冲器的设备在高工作温度下显著减少暗电流.
    • 光谱响应率略有增加,与材料质量改善相关.

    结论:

    • 阶级级的AlInAs缓冲层有效地抑制了网格不匹配的InAs光探测器中的缺陷驱动的泄漏电流.
    • 这种缓冲策略提高了光检测器的性能,特别是在高温操作条件下.
    • 这些发现为在不相似的基板上开发高性能光电子设备提供了途径.