Double-sided micromachining process for silicon cantilever using a parallel capacitively coupled plasma

Wei-Chih Wang; Joe Nhut Ho; Per G. Reinhall

doi:10.1117/1.1856928

1 January 2005 Double-sided micromachining process for silicon cantilever using a parallel capacitively coupled plasma

Wei-Chih Wang, Joe Nhut Ho, Per G. Reinhall

Journal of Micro/Nanolithography, MEMS, and MOEMS, Vol. 4, Issue 1, 013010 (January 2005). https://doi.org/10.1117/1.1856928

Abstract

A double-sided micromachining process for silicon-based device fabrication is developed that allows the use of capacitively coupled reactive ion etching (RIE) equipment for high-aspect-ratio etching. The effects of the masking materials and RIE conditions are discussed. Based on the experimental results, a 1000-Å-thick Al film sufficiently protects the unexposed substrate while allowing the etching of a 350-µm-deep hole with an area of 3×3 mm² when etching with SF₆/CHF₃/O₂plasma. A 2000-µm-long and 100-µm-wide (with layers of Al/SiO₂/Si and thickness of 0.1/2.2/40 µm, respectively) cantilever beam is achieved. A silicon etch rate up to 2.5 to 2.8 µm/min is obtained and an anisotropy of A=0.5 (A=1–V/H, where V is the horizontal undercut and H is the etch depth) is obtained. The technique is developed mainly for bulk micromachining of silicon or composite silicon cantilever structures.

©(2005) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Wei-Chih Wang, Joe Nhut Ho, and Per G. Reinhall "Double-sided micromachining process for silicon cantilever using a parallel capacitively coupled plasma," Journal of Micro/Nanolithography, MEMS, and MOEMS 4(1), 013010 (1 January 2005). https://doi.org/10.1117/1.1856928

Published: 1 January 2005

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