薄膜晶体管中的移动性高估:设备几何和边缘电流的影响
Soohyun Kim1, Youngjoon Lee1, Seokyeon Shin1
1Graduate School of Semiconductor Materials and Devices Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of Korea.
ACS nano
|October 10, 2025
概括
在无形氧化物半导体薄膜晶体管 (氧化物TFT) 中的场效应移动性 (FEM) 由于错误的评估方法,经常被高估. 本研究提出了一种新的方法来纠正这些高估值,使氧化物TFT材料的比较更可靠.
科学领域:
- 材料科学 材料科学 材料科学
- 电气工程 电气工程
- 半导体物理 半导体物理
背景情况:
- 无形氧化物半导体薄膜晶体管 (氧化物TFT) 具有低温处理和高载体流动性等优势,导致它们在显示器中使用,并有可能用于DRAM应用.
- 设备的可靠性,特别是门偏差应力不稳定性,仍然是推动氧化物TFT超越LTPS技术的挑战.
- 准确评估场效应移动性 (FEM) 和偏差稳定性对于氧化物TFT的材料选择和工艺开发至关重要.
研究的目的:
- 为了证明如何以及为什么在氧化物TFT中会发生场效应移动性 (FEM) 过高估计.
- 引入一种新的,准确的方法来评估氧化物TFT中的FEM.
- 为纠正高估的FEM值提供一个框架,并使客观的物质比较成为可能.
主要方法:
- 氧化物TFT的实验数据分析.
- 模拟分析建模,包括TCAD模拟.
- 基于合规映射的FEM评估的紧分析表达式的导出.
主要成果:
- 识别了不正确的FEM评估方法的广泛使用,导致已发表的氧化物TFT研究中的高估值.
- 使用TCAD模拟和实验测量验证了用于FEM计算的新分析表达式.
- 建立了一个一般框架,用于检测和纠正氧化物TFT中的移动性高估值.
结论:
- 对FEM的高估是氧化物TFT研究中的一个重要问题,阻碍了客观的材料和工艺比较.
- 拟议的FEM评估方法通过模拟和实验验证,为准确的移动性评估提供了可靠的方法.
- 采用这种更正的FEM评估方法对于推进高流动性氧化物TFT技术和实现可靠的比较至关重要.
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