超薄氧化物与干净的范德瓦尔斯接口的整合,用于二维三明治异构结构电子产品
Yumei Jing1, Xianfu Dai1, Junqiang Yang1
1School of Physics, Central South University, No. 932 South Lushan Road, Changsha 410083, China.
Nano letters
|March 25, 2024
概括
研究人员开发了一种新方法,将高-κ介电材料与2D半导体集成,用于先进的电子产品. 这种技术使低功耗的范德瓦尔斯 (vdW) 异构结构设备具有更好的性能.
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:
- 在低功率范德瓦尔斯 (vdW) 异构结构中,将高κ介电与二维 (2D) 半导体集成,在实现高接口质量和所需的介电性质方面面临挑战.
- 现有的方法很难满足对先进的二维电子设备的严格要求.
研究的目的:
- 展示一种用于将超薄高-κ介电材料集成到vdW异构结构中的新方法.
- 为了实现高质量的接口和优良的介电性质,用于低功耗的二维电子产品.
主要方法:
- 选择性热氧化 hafnium diselenide (HfSe) 前体,在vdW异构结构中形成超薄无形氧化 hafnium (HfO).
- 使用自清洗过程来确保高质量的界面.
主要成果:
- 实现了一个高质量的接口,接口状态密度低 (10-11-10-12 cm-2 eV-1).
- 合成的HfO2具有优良的介电性质:等效氧化物厚度 (EOT) ~1.5 nm,高介电常数 (κ) ~16,超低的泄漏电流 (10-6 A/cm2) 和高分解场 (9.5 MV/cm).
- 证明了低功耗的MoS2晶体管与的切换 (下值波动的61mV/十年).
结论:
- 一步整合方法有效地将高-κ介电材料纳入VDW三明治异构结构.
- 这种方法对开发下一代满足苛刻介电要求的低功耗二维电子产品具有重大潜力.
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