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Investigation of polyvinylpyrrolidone as an inhibitor for trench super-filling of cobalt electrodeposition
- Source :
- Journal of the Taiwan Institute of Chemical Engineers. 112:232-239
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Polyvinylpyrrolidone (PVP) is studied in this paper as an inhibitor of cobalt electrodeposition. The suppression effect of PVP was analyzed through electrochemical methods, including cyclic voltammetry (CV) and galvanostatic measurements (GM) tests. It is indicated that PVP effectively suppresses the electrodeposition of cobalt and chloride ion accelerates this suppression. Further experiments verify that PVP inhibits the deposition of cobalt through the adsorption on the electrode surface. Quantum chemical calculations were employed to calculate the molecular orbitals of PVP and the electrostatic potential (ESP) energy of the involved molecules. The simulation results imply that the amide group acts as the main electrophilic attack region and facilitates nucleophilic reactions to bond with cobalt. High aspect ratio trench filling on silicon wafer was achieved with the addition of PVP, which confirms that PVP is an applicable inhibitor for the practical electrodeposition of cobalt filling. The mechanism of cobalt trench filling was proposed to explain the role of PVP in the electroplating filling. Besides, crystalline and morphological characterizations reveal that PVP is able to inhibit the specific crystal growth of cobalt, especially the growth of 220 crystal plane, affect the crystal morphology of cobalt and improve surface compactness.
- Subjects :
- inorganic chemicals
Materials science
Polyvinylpyrrolidone
General Chemical Engineering
technology, industry, and agriculture
chemistry.chemical_element
Crystal growth
macromolecular substances
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
Electrochemistry
01 natural sciences
0104 chemical sciences
Adsorption
chemistry
Chemical engineering
medicine
Molecule
Cyclic voltammetry
0210 nano-technology
Electroplating
Cobalt
medicine.drug
Subjects
Details
- ISSN :
- 18761070
- Volume :
- 112
- Database :
- OpenAIRE
- Journal :
- Journal of the Taiwan Institute of Chemical Engineers
- Accession number :
- edsair.doi...........f2f9e593a8b8dc98968fcb3e3d9816b3