Thermodynamic Considerations in the Design of Electrochemical Atomic Layer Etching of Copper

Thermodynamic Considerations in the Design of Electrochemical Atomic Layer Etching of Copper
复制标题

铜电化学原子层蚀刻设计中的热力学考虑

DOI:
10.1149/1945-7111/ac030e
复制
发表时间:
2021
影响因子:
3.9
通讯作者:
Akolkar, Rohan
Akolkar, Rohan
中科院分区:
工程技术4区
文献类型:
--
作者:
Gong, Yukun;Akolkar, Rohan

文献摘要

参考文献

相似文献

电化学原子层蚀刻(e-ALE)是一种一次蚀刻一个原子层的独特方法。如果在最佳条件下实施,e-ALE可确保由于原子逐层蚀刻特性而导致的表面粗糙度变化最小。在铜(Cu)的e-ALE过程中,关键的第一步是通过表面限制硫化反应形成硫化亚铜(Cu 2S)单层膜。在本文中,我们调查的硫化层作为硫化电位的函数的表面覆盖率,并表明,达到的平衡覆盖率可以建模使用Frumkin吸附等温线。在-0.74 V vs SHE的电位下,硫化提供了Cu 2 S对Cu的近乎完全的单层覆盖,这随后促进了逐层蚀刻模式中的e-ALE,从而保持了蚀刻后的光滑表面。在相对于-0.74 V的负电位下操作提供了亚单层覆盖,这体现在蚀刻期间的粗糙度放大。为Cu e-ALE过程中操作条件的选择提供了理论指导。
Electrochemical atomic layer etching (e-ALE) is a unique approach for etching metals one atomic layer at a time. If practiced under optimal conditions, e-ALE ensures minimal evolution of surface roughness due to the atomic layer-by-layer etching characteristics. During e-ALE of copper (Cu), the crucial first step is the formation of a cuprous sulfide (Cu 2 S) monolayer via the surface-limited sulfidization reaction. In this paper, we investigate the surface coverage of this sulfide layer as a function of the sulfidization potential, and show that the equilibrium coverage attained can be modeled using the Frumkin adsorption isotherm. At a potential of–0.74 V vs SHE, sulfidization provides near-complete monolayer coverage of Cu by Cu 2 S, which then facilitates e-ALE in a layer-by-layer etching mode thereby maintaining a smooth post-etch surface. Operation at potentials negative with respect to–0.74 V provides sub-monolayer coverage, which manifests in roughness amplification during etching. This work provides a thermodynamics-guided foundation for the selection of operating conditions during Cu e-ALE.
碱性溶液中Cu(111)电极上硫吸附层的结构
DOI: --
发表时间: 2003
期刊:
影响因子: --
作者:
M. Sugimasa;J. Inukai;K. Itaya
通讯作者: K. Itaya
基于等离子体-铜反应的室温铜蚀刻
DOI: 10.1063/1.1347388
发表时间: 2001
影响因子: 4
作者:
Y. Kuo;Sangheon Lee
通讯作者: Sangheon Lee
通过气相氧化和化学络合精确控制纳米级铜蚀刻
DOI: 10.1021/acs.jpcc.0c08932
发表时间: 2021
期刊: The Journal of Physical Chemistry C
影响因子: --
作者:
Sheil, Ryan;Martirez, J. Mark;Sang, Xia;Carter, Emily A.;Chang, Jane P.
通讯作者: Chang, Jane P.
铂上阳离子的吸附——铊的充电曲线研究
DOI: --
发表时间: 1965
期刊:
影响因子: --
作者:
B. J. Bowles
通讯作者: B. J. Bowles
一种新型等离子体干法蚀刻方法
DOI: 10.1143/jjap.39.l188
发表时间: 2000
影响因子: 1.5
作者:
Y. Kuo;Sangheon Lee
通讯作者: Sangheon Lee