Curved structure of Si by improving etching direction controllability in magnetically guided metal-assisted chemical etching

Title
Curved structure of Si by improving etching direction controllability in magnetically guided metal-assisted chemical etching
Authors
김유찬천동원조민경배지환김주영Tae Kyoung KimSungho Jiin
Issue Date
2020-07
Publisher
Micromachines
Citation
VOL 11, 744
Abstract
Metal-assisted chemical etching (MACE) is widely used to fabricate micro-/nano-structured Si owing to its simplicity and cost-effectiveness. The technique of magnetically guided MACE, involving MACE with a tri-layer metal catalyst, was developed to improve etching speed as well as to adjust the etching direction using an external magnetic field. However, the controllability of the etching direction diminishes with an increase in the etching dimension, owing to the corrosion of Fe due to the etching solution; this impedes the wider application of this approach for the fabrication of complex micro Si structures. In this study, we modified a tri-layer metal catalyst (Au/Fe/Au), wherein the Fe layer was encapsulated to improve direction controllability; this improved controllability was achieved by protecting Fe against the corrosion caused by the etching solution. We demonstrated curved Si microgroove arrays via magnetically guided MACE with Fe encapsulated in the tri-layer catalyst. Furthermore, the curvature in the curved Si microarrays could be modulated via an external magnetic field, indicating that direction controllability could be maintained even for the magnetically guided MACE of bulk Si. The proposed fabrication method developed for producing curved Si microgroove arrays can be applied to electronic devices and micro-electromechanical systems.
URI
http://pubs.kist.re.kr/handle/201004/71833
ISSN
2072-666X
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KIST Publication > Article
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