在高K介电氧氧化物和二维二硫化物之间的干净的范德瓦尔斯接口
1Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK.
概括
氧化 (ZrO2) 与二氧化 (MoS2) 2D半导体形成一个干净的接口,使先进的场效应晶体管 (FET) 成为可能. 这一突破解决了行业对下一代电子设备的扩展需求.
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
- 纳米技术 纳米技术
背景情况:
- 二维 (2D) 过渡金属二甲基化物 (TMD) 半导体由于其理想的缩放特性,对晶体管技术具有前景.
- 开发规模化场效应晶体管 (FET) 需要提供低等效氧化物厚度的行业兼容门介电材料.
- 二硫化物 (MoS2) 是用于先进电子应用的关键二维材料.
研究的目的:
- 为了研究氧化 (ZrO2) 和2D MoS2之间的接口特性,以便在FET中作为门介电剂进行潜在的使用.
- 为了评估基于MoS2的FET使用ZrO2作为门介电体的性能.
- 探索使用ZrO2.2.2制造其他2D TMD FET,如化 (WSe2),使用ZrO2.2.
主要方法:
- 用光电子光谱分析ZrO2,MoS2和其他介电材料 (SiO2,HfO2) 之间的接口相互作用.
- 后门和顶门的场效应晶体管 (FET) 使用单层MoS2和ZrO2介电材料制造.
- 用原子分辨率成像来描述MoS2.2上沉积的ZrO2的接口质量.
主要成果:
- ZrO2与MoS2形成了一个干净的,非互动的接口,与诱导兴奋剂的SiO2和HfO2不同.
- 具有ZrO2的单层MoS2FET表现出色,包括稳定的正门电压 (0.36V),低次门波动 (75mV/dec) 和高的ON电流 (>400μA).
- P型WSe2 FET显示了高的ON状态电流 (>200μA/μm),而顶端的FET则达到0.86nm的等效氧化物厚度,其下值波动为80mV/dec.
结论:
- ZrO2 是一个适合于 2D TMD FET 的行业兼容的高k介电体,与 MoS2.2 形成一个干净的接口.
- 无缺陷的ZrO2/MoS2接口可以通过门金属工作功能工程有效调节FET性能,包括值电压.
- 这项工作为先进的基于半导体的2D电子产品铺平了道路,以满足行业不断扩大的需求.
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