Bulk micromachining of Si by metal-assisted chemical etching

Sang Mi Kim, Dahl Young Khang

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Bulk micromachining of Si is demonstrated by the well-known metal-assisted chemical etching (MaCE). Si microstructures, having lateral dimension from 5 ìm up to millimeters, are successfully sculpted deeply into Si substrate, as deep as >100 ìm. The key ingredient of this success is found to be the optimizations of catalyst metal type and its morphology. Combining the respective advantages of Ag and Au in the MaCE as a Ag/Au bilayer confi guration leads to quite stable etch reaction upon a prolonged etch duration up to >5 h. Further, the permeable nature of the optimized Ag/Au bilayer metal catalyst enables the etching of pattern features having very large lateral dimension. Problems such as the generation of micro/nanostructures and chemical attacks on the top of pattern surface are successfully overcome by process optimizations such as post-partum sonication treatment and etchant formulation control. The method can also be successful to vertical micromachining of Si substrate having other crystal orientations than Si(100), such as Si(110) and Si(111). The simple, easy, and low-cost nature of present approach may be a great help in bulk micromachining of Si for various applications such as microelectromechanical system (MEMS), micro total analysis system (ìTAS), and so forth.

Original languageEnglish
Pages (from-to)3761-3766
Number of pages6
JournalSmall
Volume10
Issue number18
DOIs
Publication statusPublished - 2014 Sep 1

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Microtechnology
Micromachining
Etching
Metals
Chemical attack
Catalysts
Sonication
Nanostructures
Substrates
Crystal orientation
MEMS
Costs and Cost Analysis
Microstructure
Costs

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

Cite this

Kim, Sang Mi ; Khang, Dahl Young. / Bulk micromachining of Si by metal-assisted chemical etching. In: Small. 2014 ; Vol. 10, No. 18. pp. 3761-3766.
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Bulk micromachining of Si by metal-assisted chemical etching. / Kim, Sang Mi; Khang, Dahl Young.

In: Small, Vol. 10, No. 18, 01.09.2014, p. 3761-3766.

Research output: Contribution to journalArticle

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