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Micromachines 2015, 6(11), 1617-1628; doi:10.3390/mi6111445

The Fringe-Capacitance of Etching Holes for CMOS-MEMS

1
Department of Mechanical and Electromechanical Engineering, National ILan University, ILan 26041, Taiwan
2
Institute of Applied Mechanics, National Taiwan University, Taipei 10617, Taiwan
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Ching-Liang Dai
Received: 7 July 2015 / Revised: 21 October 2015 / Accepted: 21 October 2015 / Published: 28 October 2015
(This article belongs to the Special Issue CMOS-MEMS Sensors and Devices)
View Full-Text   |   Download PDF [4465 KB, uploaded 28 October 2015]   |  

Abstract

Movable suspended microstructures are the common feature of sensors or devices in the fields of Complementary-Metal-Oxide-Semiconductors and Micro-Electro-Mechanical Systems which are usually abbreviated as CMOS-MEMS. To suspend the microstructures, it is commonly to etch the sacrificial layer under the microstructure layer. For large-area microstructures, it is necessary to design a large number of etching holes on the microstructure to enhance the etchant uniformly and rapidly permeate into the sacrificial layer. This paper aims at evaluating the fringe capacitance caused by etching holes on microstructures and developing empirical formulas. The formula of capacitance compensation term is derived by curve-fitting on the simulation results by the commercial software ANSYS. Compared with the ANSYS simulation, the deviation of the present formula is within ±5%. The application to determine the capacitance of an electrostatic micro-beam with etching holes is demonstrated in a microstructure experiment, which agrees very well with the experimental data, and the maximum deviation is within ±8%. The present formula is with simple form, wide application range, high accuracy, and easy to use. It is expected to provide the micro-device designers to estimate the capacitance of microstructures with etching holes and predominate in the device characteristics. View Full-Text
Keywords: CMOS; etching holes; fringe capacitance; MEMS CMOS; etching holes; fringe capacitance; MEMS
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Wang, Y.-T.; Hu, Y.-C.; Chu, W.-C.; Chang, P.-Z. The Fringe-Capacitance of Etching Holes for CMOS-MEMS. Micromachines 2015, 6, 1617-1628.

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