Open AccessAdsorption Mechanism of Potassium Oleate on Cobalt Surface Based on Cobalt Interconnection CMP: A Combined Experimental and DFT Investigation
Author(s) -
Xiaoqin Sun,
Tengda Ma,
Da Yin,
Baimei Tan,
Fan Yang,
Mengrui Liu,
Pengcheng Gao,
Shihao Zhang,
Yazhen Wang,
Yangang He
Publication year - 2021
Publication title -
ecs journal of solid state science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.488
H-Index - 51
eISSN - 2162-8777
pISSN - 2162-8769
DOI - 10.1149/2162-8777/abe1d8
Subject(s) - cobalt , x ray photoelectron spectroscopy , passivation , materials science , adsorption , dielectric spectroscopy , electrochemistry , benzotriazole , chemical engineering , inorganic chemistry , electrode , chemistry , nanotechnology , metallurgy , layer (electronics) , engineering
Potassium oleate (PO) is a promising corrosion inhibitor to replace benzotriazole (BTA) for cobalt (Co) wiring in the integrated circuit (IC). The adsorption characteristics of different cobalt surfaces were characterized by the contact angle measurement. The formation of passive Co–PO film and the corrosion inhibitor efficiency of PO to cobalt was analyzed by electrochemistry and electrochemical impedance spectroscopy (EIS), and the change of chemical elements on the cobalt surface was analyzed by X-ray photoelectron spectroscopy (XPS). Furthermore, quantum chemical calculation and molecular dynamics simulation based on density functional theory (DFT) further revealed the adsorption mechanism of PO and cobalt at the molecular level. The results showed that Co–PO passivation film formed on the cobalt surface, besides, 2 mM PO has achieved the best inhibition efficiency on cobalt surface.