Document Type

Article

Research Focus Area

Advanced and Nanostructured Materials

Publication Date

11-17-2011

Journal or Book Title

The Journal of Physical Chemistry C

Volume

115

Issue

45

First Page

22354

Last Page

22359

DOI

10.1021/jp2054266

Abstract

Metallization layers nanometers to tens of nanometers thick are desirable for semiconductor interconnects, among other technologically relevant nanostructures. Whereas aqueous deposition of such films is economically attractive, fabrication of continuous layers is particularly challenging on oxidized substrates used in many applications. Here it is demonstrated that galvanic displacement can deposit thin adherent copper layers on aluminum foils and thin films from alkaline copper sulfate baths. According to scanning electron microscopy and quartz crystal microbalance measurements, the use of relatively low CuSO4 concentrations produced films composed of copper nanoparticles overlying a uniform continuous copper layer on the order of nanometers in thickness. It seems that there are no precedents for such thin layers formed by aqueous deposition on oxidized metals. The thin copper layers are explained by a mechanism in which copper ions are reduced by surface aluminum hydride on Al during alkaline dissolution.

Comments

Reprinted with permission from Journal of Physical Chemistry C 115 (2011): 22354–22359, doi:10.1021/jp2054266. Copyright 2011 American Chemical Society.

Copyright Owner

American Chemical Society

Language

en

File Format

application/pdf

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