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Fabrication and characterisation of suspended microstructures of tantalum

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Al_masha_al_2017_J._Micromech._Microeng._27_015020.pdf (2.010Mb)
Date
01/2017
Author
Al-Masha'Al, A.
Mastropaolo, E.
Bunting, A.
Dunare, C.
Cheung, Rebecca
Keywords
Residual stress
Buckling
Dry etching
Wet etching
Tantalum
QC Physics
TK Electrical engineering. Electronics Nuclear engineering
Electrical and Electronic Engineering
Mechanical Engineering
Mechanics of Materials
Electronic, Optical and Magnetic Materials
NDAS
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Abstract
An investigation of the influence of deposition and post-fabrication processes on the final mechanical structure of tantalum beams is reported in the present study. The final deflection profiles of doubly supported beams made from compressive and tensile-stressed films have been studied experimentally. An optimum finite element model has been developed to predict the buckling behaviour of the doubly supported beams by considering the boundary conditions in the form of a compressive stress and an applied load. No matter which etch release method has been used, the initial stress state of the as-deposited films has been found to have a significant impact on the final deflection profile of the fabricated device. The compressive-stressed films have presented larger deflection in the final released beams than the tensile-stressed films. Taking into account the type of etch release methods, the beams that have been released in the dry etch release processes have been found to deform more vertically than those released in the wet-etch release method. Moreover, it has been found that the amplitude of vertical deflection increases with the increase of the beam length and thickness. The results indicate that optimum profiles of tantalum suspended structures can be obtained from the tensile-stressed films that have been released by the wet etching method with an aspect ratio of 1:48.
Citation
Al-Masha'Al , A , Mastropaolo , E , Bunting , A , Dunare , C & Cheung , R 2017 , ' Fabrication and characterisation of suspended microstructures of tantalum ' , Journal of Micromechanics and Microengineering , vol. 27 , no. 1 , 015020 . https://doi.org/10.1088/0960-1317/27/1/015020
Publication
Journal of Micromechanics and Microengineering
Status
Peer reviewed
DOI
https://doi.org/10.1088/0960-1317/27/1/015020
ISSN
0960-1317
Type
Journal article
Rights
© 2016 IOP Publishing Ltd. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Description
Funding: UK Engineering and Physical Sciences Research Council (EPSRC).
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/17332

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