Strain effects in multilayers

Colin M. A. Ashruf; Patrick J. French; Charles R. de Boer; Pasqualina M. Sarro

doi:10.1117/12.284475

5 September 1997 Strain effects in multilayers

Colin M. A. Ashruf, Patrick J. French, Charles R. de Boer, Pasqualina M. Sarro

Proceedings Volume 3223, Micromachining and Microfabrication Process Technology III; (1997) https://doi.org/10.1117/12.284475
Event: Micromachining and Microfabrication, 1997, Austin, TX, United States

Abstract

High stress levels can cause problems for both electronics and micromechanics. It is therefore important to characterize the stress and strain of the different mechanical layers used for processing. In order to predict the properties of a multilayered structure it is not sufficient to know the mechanical properties of each independent layer. The deposited layers may have a considerable effect on the mechanical properties of the underlying layer. This paper discusses the importance of the effect of each layer on underlying layers and on the total structure, using poly-silicon and silicon- nitride as the mechanical layers. The measurements show that at an anneal of 850 degrees Celsius the influence of nitride on the underlying poly is considerable. At an anneal of 1000 degrees Celsius this effect disappears. We also examined the stress in poly-nitride-poly layers in order to find out the influence of annealing in between the deposition of the layers. Measurements show that the temperature of the anneal is the dominant factor.

Citation Download Citation

Colin M. A. Ashruf, Patrick J. French, Charles R. de Boer, and Pasqualina M. Sarro "Strain effects in multilayers", Proc. SPIE 3223, Micromachining and Microfabrication Process Technology III, (5 September 1997); https://doi.org/10.1117/12.284475

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