具有金属封闭层氧化层的In-Ga-Zn-O薄膜晶体管的移动性和电流增强
Hyeonjeong Sun1, Jiyoung Bang2, Hyoungbeen Ju2
1Department of Electronic Engineering, Hanyang University, Seoul 04763, Republic of Korea.
Nanotechnology
|June 5, 2024
概括
一个氧化 (Ta) 覆盖层显著提高了无形---氧化 (a-IGZO) 薄膜晶体管的移动性超过8倍. 这种新的方法提高了高性能氧化物半导体设备的载体密度.
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
- 设备工程 设备工程
背景情况:
- 无形---氧化物 (a-IGZO) 是薄膜晶体管 (TFT) 的一个关键材料.
- 实现高场效移动性 (μFE) 对于先进的电子应用至关重要.
- 现有的增强移动性的方法经常面临与其他设备参数的权衡.
研究的目的:
- 为了研究氧化 (Ta) 封闭层对a-IGZO TFT性能的影响.
- 了解Ta氧化如何影响a-IGZO中的氧气空缺和载体密度.
- 优化 Ta 覆盖,以提高场效应移动性 (μFE) 和设备稳定性.
主要方法:
- 制造具有不同氧化Ta覆盖层覆盖的a-IGZO TFT.
- 电气性质的表征,包括值电压 (Vth),状态电流和场效应移动性 (μFE).
- 评估门偏差应力稳定性和分析氧气空缺的作用.
主要成果:
- 在90%的Ta覆盖率下实现了μFE的8倍增长,从16cm2Vs−1增加到140cm2Vs−1.
- 氧化Ta封闭会产生氧气空缺,增加a-IGZO通道中的载体密度.
- 在接触区域部分发现a-IGZO保持了低的异常电流和接近零的Vth.
结论:
- 氧化酸封闭是一种新且有效的方法来提高a-IGZO TFT的性能.
- 该技术平衡了载体增强与稳定的设备操作.
- 这种方法为下一代高性能氧化物半导体设备提供了一个有希望的途径.
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