The design of multilayered polysilicon for MOEMS applications

D. Sherman, H. Kahn, Stephen Phillips, R. Ballarini, A. H. Heuer

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A rigorous analysis of a multilayered polysilicon laminated system, constructed by alternating deposition of low-pressure chemical vapor deposition (LPCVD) polysilicon at two different temperatures is presented. Different residual deformation fields are generated in these polysilicon thin films as a function of fabrication temperatures, due to different crystallization behavior at the two temperatures. The combination of the two layers, however, enables precise control of the radius of curvature of released structures, provided the material properties are well defined. We describe a new method, which combines experimental and numerical procedures, to define the material properties, which are responsible for the residual stresses as a function of layer thickness, as well as a procedure to design the desired curvature of a multilayered Micro-optical-electromechanical system (MOEMS) device. A linear deformation field is assumed. It is shown that precise design of the thicknesses of the individual layer is a prerequisite for controlled curvature. The procedure we have developed predicts the curvature of multilayered polysilicon systems with good precision.

Original languageEnglish (US)
Title of host publicationMaterials Research Society Symposium - Proceedings
Number of pages6
StatePublished - 2002
Externally publishedYes
EventThin Films: Stresses and Mechanical Properties IX - Boston, MA, United States
Duration: Nov 26 2001Nov 30 2001


OtherThin Films: Stresses and Mechanical Properties IX
Country/TerritoryUnited States
CityBoston, MA

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials


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