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
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发表时间:
2021
影响因子:
3.9
通讯作者:
Akolkar, Rohan
中科院分区:
文献类型:
--
作者:
Gong, Yukun;Akolkar, Rohan
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.
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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
影响因子:
4
作者:
Y. Kuo;Sangheon Lee
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Sangheon Lee
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:
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通讯作者:
Chang, Jane P.
DOI:
--
发表时间:
1965
期刊:
影响因子:
--
作者:
B. J. Bowles
通讯作者:
B. J. Bowles
影响因子:
1.5
作者:
Y. Kuo;Sangheon Lee
通讯作者:
Sangheon Lee