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分相对比 (DPC) 映射电场:优化实验条件.

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  • 1Thermo Fisher Scientific, Eindhoven, the Netherlands.

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概括
此摘要是机器生成的。

扫描传输电子显微镜 (STEM) 中的相差对比 (DPC) 有效地绘制了半导体中的电场. 优化是关键,在较厚的样本中,DPC在0.5mV/nm以上的场中被证明是可靠的.

关键词:
在 DPC 中,DPC 必须是 DPC.这是一个声音.兴奋剂的使用 兴奋剂的使用电场是一个电场.n-n 交叉点的交叉点在 p-n 交叉点上.一个半导体半导体.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 电子显微镜电子显微镜

背景情况:

  • 分相对比 (DPC) 是一种强大的技术,用于使用扫描传输电子显微镜 (STEM) 可视化半导体材料内的电场.
  • 优化实验参数对于准确的电场映射至关重要,但仍然是一个重大挑战.

研究的目的:

  • 系统地评估和比较影响STEMDPC测量的关键实验参数.
  • 确定DPC的检测极限和实际适用性,用于半导体中的电场映射.

主要方法:

  • 通过变化的收角度,摄像头长度,加速电压,样品配置和方向来研究DPC性能.
  • 使用了四象限细分探测器和样本,其 (As) 度不同.
  • 与不同样本厚度的估计电场相关的DPC测量.

主要成果:

  • 对于145nm厚的样本,DPC测量显示了与电场的近线性关系,低至大约0.5mV/nm.
  • 通过增加平面交叉点的样本厚度,可以提高DPC的信号噪声比.
  • 在电场低于0.5mV/nm或在有曲线连接处的情况下,DPC的可靠性会降低.

结论:

  • 带有细分探测器的DPC是一种在半导体平面连接处映射超过0.5mV/nm的电场的实用方法.
  • 对于较弱的电场或曲线交叉点,需要使用其他高灵敏度技术,例如带有像素检测器的4D STEM.
  • 本研究为选择各种半导体设备中电场表征的适当技术提供了必要的指导.